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Subject: Chemistry, Analytical Chemistry Keywords: NMR; chemometrics; chloroform; phosgene; hydrochloric acid; sample degradation; pH-shift; protonation

Online: 5 July 2022 (03:53:09 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202206.0126.v1

Development, Validation for Determination of Verteporfin by HPLC-DAD and Application to Real samples

Ahmet Ozgun DOGRAMACIOGLU, Cemile ÖZCAN

Subject: Chemistry, Analytical Chemistry Keywords: HPLC-DAD-UV; Verteporfin; ICH Q2 R; Validation

Online: 8 June 2022 (11:03:04 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202206.0082.v1

Studies on the Effects of Process Conditions on Separation of B1, B2 and B3 Vitamin Mixture Using HILIC and RPLC Chromatography

Marcin Chutkowski, Piotr Ziobrowski, Mateusz Przywara, Justyna Kamińska, Wojciech Zapała

Subject: Chemistry, Analytical Chemistry Keywords: HILIC chromatography; RPLC chromatography; B1 vitamin; B2 vitamin; B3 vitamin

Online: 6 June 2022 (10:01:49 CEST)

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Preprint COMMUNICATION | doi:10.20944/preprints202112.0420.v3

Essential Terminology and Considerations for Validation of Non-targeted Methods

Kapil Nichani, Steffen Uhlig, Manfred Stoyke, Sabine Kemmlein, Franz Ulberth, Ilka Haase, Maik Döring, Stephan G. Walch, Petra Gowik

Subject: Chemistry, Analytical Chemistry Keywords: Non-targeted methods; method validation; food fraud; food authenticity; mass spectrometry; spectroscopy; NGS; NMR

Online: 23 May 2022 (11:10:00 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202205.0034.v1

Rapid and Non-Destructive Analysis of Corky Off-Flavors in Natural Cork Stoppers by A Wireless and Portable Electronic Nose

José Pedro Santos, Isabel Sayago, Jose Luis Sanjurjo, María Soledad Perez-Coello, Maria Consuelo Díaz-Maroto

Subject: Chemistry, Analytical Chemistry Keywords: Natural cork stoppers; Corky off-flavors; Electronic nose; Machine learning algorithms; Artificial neural networks

Online: 5 May 2022 (10:45:17 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202203.0292.v1

Simultaneous Determination of Paracetamol, Ibuprofen, and Caffeine in Tablets by Molecular Absorption Spectroscopy Combined with Classical Least Square Method

Binh Thuc Tran, Tuyen Ngoc Tran, Ai My Thi Tran, Giang Chau Dang Nguyen, Quynh Trang Thi Nguyen

Subject: Chemistry, Analytical Chemistry Keywords: paracetamol; ibuprofen; caffeine; classical least-square; simultaneous; spectroscopy

Online: 22 March 2022 (03:26:27 CET)

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Preprint COMMUNICATION | doi:10.20944/preprints202203.0152.v1

Coated Blade Spray-Mass Spectrometry as a New Approach for the Rapid Characterization of Brain Tumors

Joanna Bogusiewicz, Magdalena Gaca-Tabaszewska, Dominik Olszówka, Karol Jaroch, Jacek Furtak, Marek Harat, Janusz Pawliszyn, Barbara Bojko

Subject: Chemistry, Analytical Chemistry Keywords: SPME; CBS-MS; brain tumors; lipidomics

Online: 10 March 2022 (14:16:39 CET)

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Preprint ARTICLE | doi:10.20944/preprints202203.0012.v1

Monitoring Farmed Fish Welfare by Measurement of Cortisol as Stress Marker in Fish Feces by Liquid Chromatography Coupled with Tandem Mass Spectrometry

Vanessa Andrea Meling, Kjetil Berge, David Lausten Knudsen, Per Ola Rønning, Cato Brede

Subject: Chemistry, Analytical Chemistry Keywords: aquaculture; fish; salmon; feces; deconjugation; hydrolysis; extraction; chromatography; mass spectrometry; LC-MS/MS

Online: 1 March 2022 (09:36:18 CET)

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Preprint ARTICLE | doi:10.20944/preprints202202.0300.v1

Rapid on-site Detection of Illicit Drugs in Smuggled Samples with a Portable Electrochemical Device

Marc Parrilla, Amorn Slosse, Robin Van Echelpoel, Noelia Felipe Montiel, Amelia R Langley, Filip Van Durme, Karolien De Wael

Subject: Chemistry, Analytical Chemistry Keywords: Electrochemical sensors; square-wave voltammetry; screen-printed electrodes; electrochemical profiling; illicit drugs; forensic analysis; Raman spectrometer; on-site detection; FTIR spectrometer

Online: 24 February 2022 (04:00:15 CET)

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Preprint ARTICLE | doi:10.20944/preprints202201.0403.v2

Portable FRET-Based Biosensor Device for On-Site Lead Detections

Wei-Qun Lai, Yu-Fen Chang, Fang-Ning Chou, De-Ming Yang

Subject: Chemistry, Analytical Chemistry Keywords: lead biosensors; FRET; portable Pb sensor; smartphone-based device; Met-lead; tap water lead; groundwater lead

Online: 23 February 2022 (10:53:14 CET)

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Preprint ARTICLE | doi:10.20944/preprints202202.0118.v1

Cognate DNA Recognition by Engrailed Homeodomain Involves a Conformational Change Controlled via an Electrostatic-Spring-Loaded Latch

Nicola D'Amelio, Benjamin Tanielian, Mourad Sadqi, Pilar Lopez-Navajas, Victor Victor Muñoz

Subject: Chemistry, Analytical Chemistry Keywords: protein-DNA interactions; DNA recognition; transcription factors; DNA binding domains; con-formational change; nuclear magnetic resonance; circular dichroism; control of gene expression; homeodomains.

Online: 8 February 2022 (14:53:06 CET)

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Transcription factors must scan genomic DNA, recognize the cognate sequence of their control element(s), and bind tightly to them. The DNA recognition process is primarily carried out by their DNA binding domains (DBD), which interact with the cognate site with high affinity and more weakly with any other DNA sequence. DBDs are generally thought to bind to their cognate DNA without changing conformation (lock-and-key). Here we used nuclear magnetic resonance and circular dichroism to investigate the interplay between DNA recognition and DBD conformation in the Engrailed homeodomain (EnHD), as model case for the homeodomain family of eukaryotic DBDs. We found that the conformational ensemble of EnHD is rather flexible and becomes more structured as ionic strength increases following a Debye-Hückel’s dependence. Our analysis indicates that EnHD’s response to ionic strength is mediated by a built-in electrostatic spring-loaded latch that operates as conformational transducer. We also found that, at moderate ionic strengths, EnHD changes conformation upon binding to cognate DNA. This change is of larger amplitude and somewhat orthogonal to the response to ionic strength. As a consequence, very high ionic strengths (e.g. 700 mM) block the electrostatic-spring-loaded latch and binding to cognate DNA becomes lock-and-key. However, the interplay between EnHD conformation and cognate DNA binding is robust across a range of ionic strengths (i.e. 45 to 300 mM) that covers the most physiologically-relevant conditions. Therefore, our results demonstrate the presence of a mechanism for the conformational control of cognate DNA recognition on a eukaryotic DBD. This mechanism can function as a signal transducer that immediately locks the DBD in place upon encountering the cognate site during active DNA scanning. The electrostatic-spring-loaded latch of EnHD can also enable the fine control of DNA recognition in response to local/temporal changes in ionic strength induced by variate physiological processes.

Preprint ARTICLE | doi:10.20944/preprints202201.0403.v1

Portable FRET-Based Biosensor Device for On-Site Lead Detections

Wei-Qun Lai, Yu-Fen Chang, Fang-Ning Chou, De-Ming Yang

Subject: Chemistry, Analytical Chemistry Keywords: lead biosensors; FRET; portable Pb sensor; smartphone-based device; Met-lead; tap water lead; groundwater lead

Online: 26 January 2022 (14:49:25 CET)

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Preprint ARTICLE | doi:10.20944/preprints202201.0092.v1

Rapid Simultaneous Determination of 11 Synthetic Cannabinoids in Urine by Liquid Chromatography-Triple Quadrupole Mass Spectrometry

Jianbing Wu, Fang Zhang, Xing Ke, Wei Jia, xuzhi wan, Lange Zhang, Laizhao Wang, Yilei Fan

Subject: Chemistry, Analytical Chemistry Keywords: Synthetic cannabinoids; LC-MS/MS; Simultaneous determination; Matrix effect; Urine

Online: 6 January 2022 (14:10:17 CET)

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Preprint ARTICLE | doi:10.20944/preprints202112.0493.v1

Direct in vivo Analysis of CBD- and THC-Acid Type Cannabinoids and Classification of Cannabis Cultivars by SpiderMass

Nina Ogrinc, Serge Schneider, Adèle Bourmaud, Michel Salzet, Isabelle Fournier

Subject: Chemistry, Analytical Chemistry Keywords: water-assisted laser desorption/ionization; SpiderMass; cannabinoids; mass spectrometry; plants; in vivo

Online: 30 December 2021 (19:02:18 CET)

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Preprint COMMUNICATION | doi:10.20944/preprints202112.0420.v2

Essential Terminology and Considerations for Validation of Non-targeted Methods

Kapil Nichani, Steffen Uhlig, Manfred Stoyke, Sabine Kemmlein, Franz Ulberth, Ilka Haase, Maik Döring, Stephan G Walch, Petra Gowik

Subject: Chemistry, Analytical Chemistry Keywords: Non-targeted methods; method validation; food fraud; food authenticity; mass spectrometry; spectroscopy; NGS; NMR

Online: 28 December 2021 (10:28:50 CET)

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Preprint COMMUNICATION | doi:10.20944/preprints202112.0420.v1

Towards a Mathematical Framework for Method Validation and Performance Characteristics of Non-targeted Methods for Food Authenticity

Kapil Nichani, Steffen Uhlig, Manfred Stoyke, Sabine Kemmlein, Franz Ulberth, Ilka Haase, Maik Döring, Stephan G Walch, Petra Gowik

Subject: Chemistry, Analytical Chemistry Keywords: Non-targeted methods; method validation; food fraud; food authenticity; mass spectrometry; spectroscopy; NGS; NMR

Online: 27 December 2021 (10:31:10 CET)

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Preprint ARTICLE | doi:10.20944/preprints202112.0259.v1

Multifunctional Eco-Friendly Synthesis of ZnO Nanoparticles in Biomedical Applications

Amal Mohamed Al-Mohaimeed, Wedad Altuhami Al-Onazi, Maha Farouk El-Tohamy

Subject: Chemistry, Analytical Chemistry Keywords: Oat extract; Zinc oxide nanoparticles; Green synthesis; Antibacterial; Antioxidant; Pharmaceutical analysis.

Online: 15 December 2021 (15:17:48 CET)

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Preprint ARTICLE | doi:10.20944/preprints202112.0046.v1

Rapid, Simple and Inexpensive Fabrication of Paper-based Analytical Devices by Parafilm® Hot Pressing

Sursak Kasetsirikul, Kimberley Clack, Muhammad J.A. Shiddiky, Nam-Trung Nguyen

Subject: Chemistry, Analytical Chemistry Keywords: Paperfluidics; Parafilm; Paper-based Analytical Devices

Online: 3 December 2021 (09:58:36 CET)

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Preprint REVIEW | doi:10.20944/preprints202111.0546.v1

Review on Chemical Graph Theory and Its Application in Computer-Assisted Structure Elucidation

Mehmet Aziz Yirik, Kumsal Ecem Colpan, Saskia Schmidt, Maria Sorokina, Christoph Steinbeck

Subject: Chemistry, Analytical Chemistry Keywords: chemical graph theory; computational chemistry; CASE; computer-assisted structure elucidation

Online: 29 November 2021 (15:35:43 CET)

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Preprint ARTICLE | doi:10.20944/preprints202111.0542.v1

Cyclic Voltammogram Analysis of the Environmental Aspects of the Use of Ferrocenyl Carbinols

ahmad alkhawaldeh

Subject: Chemistry, Analytical Chemistry Keywords: Cyclic voltammograms; Chronoamperometric; Cyclic ketones structure; Environment ecological aspects ferrocene; Ecological aspects

Online: 29 November 2021 (14:55:34 CET)

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Preprint ARTICLE | doi:10.20944/preprints202111.0494.v1

On the Potential of a Poly(Vinylidenefluoride-Co-hexafluoropropylene) Polymer Inclusion Membrane Containing Aliquat® 336 and Dibutyl Phthalate for V(V) Extraction from Sulfate Solutions

Salar Bahrami, Leila Dolatyari, Hassan Shayani-Jam, Mohammad Reza Yaftian, Spas D. Kolev

Subject: Chemistry, Analytical Chemistry Keywords: Polymer inclusion membrane (PIM); Poly(vinylidenefluoride-co-hexafluoropropylene); Vanadium(V); Extraction; Aliquat® 336

Online: 26 November 2021 (09:03:14 CET)

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Preprint ARTICLE | doi:10.20944/preprints202111.0430.v1

Two Compounds of 1-((4-Bromothiophen-2-Yl)Methylene)-2-(Perfluorophenyl)Hydrazine, and 1-((4-Bromo-5-Methylthiophen-2-Yl)Methylene)-2-(Perfluorophenyl)Hydrazine and They Crystal, Molecular and Electronic Properties

Július Sivý, Dušan Bortňák, Daniel Végh, Erik Rakovský

Subject: Chemistry, Analytical Chemistry Keywords: Ab initio DFT/B3LYP/6-311G/Auto calculation; hydrazine; Hirshfeld surface; hydrogen interactions; single-crystal X-ray study

Online: 23 November 2021 (15:03:30 CET)

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Preprint ARTICLE | doi:10.20944/preprints202111.0251.v1

Hydrogen Delocalization in an Asymmetric Biomolecule: The Curious Case of alpha-Fenchol

Robert Medel, Johann R. Springborn, Deborah L. Crittenden, Martin A. Suhm

Subject: Chemistry, Analytical Chemistry Keywords: delocalization; tunneling; terpene; alcohol; vibrational spectroscopy; supersonic jet expansion; structural determination

Online: 15 November 2021 (11:12:09 CET)

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Preprint ARTICLE | doi:10.20944/preprints202110.0369.v1

Determination of Avermectins Residues in Soybean, Bean and Maize Using a QuEChERS-based Method and Ultra-high-performance Liquid Chromatography Coupled to Tandem Mass Spectrometry

Fernanda Uczay, Nelson M.G. Bandeira, Luana Floriano, Osmar D. Prestes, Martha B. Adaime, Renato Zanella

Subject: Chemistry, Analytical Chemistry Keywords: Macrocyclic lactones; agricultural crops; food; sample preparation; UHPLC-MS/MS

Online: 25 October 2021 (15:50:47 CEST)

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Preprint REVIEW | doi:10.20944/preprints202105.0036.v2

A Primer on Harnessing Non-enzymatic Posttranslational Modifications for Drug Design

Marcus Long, Phillippe Ly, Yimon Aye

Subject: Chemistry, Analytical Chemistry Keywords: Electrophile; Drug Design; Covalent Drug; Chemical Biology

Online: 19 October 2021 (10:28:15 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202110.0035.v1

Distinguishing Between Isobaric Ions Using Microdroplet Hydrogen-Deuterium Exchange Mass Spectrometry

Xiaowei Song, Jia Li, Mohammad Mofidfar, Richard N. Zare

Subject: Chemistry, Analytical Chemistry Keywords: hydrogen-deuterium exchange; mass spectrometry; isobaric ions; ambient ionization; metabolic profiling

Online: 4 October 2021 (09:21:39 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202109.0527.v1

Hyaluronate-Thiol Passivation Enhances Gold Nanoparticle Peritumoral Distribution When Administered Intratumorally in Lung Cancer

Rossana Terracciano, Yareli Carcamo-Bahena, E. Brian Butler, Danilo Demarchi, Alessandro Grattoni, Carly S. Filgueira

Subject: Chemistry, Analytical Chemistry Keywords: Gold Nanoparticles; Hyaluronate-Thiol; In vitro; In vivo; Peritumoral; Cancer; Cytotoxicity; ICP-OES; Biodistribution

Online: 1 October 2021 (11:12:31 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202109.0478.v1

Mushroom’s Evaluation Based on FT-IR Fingerprint and Chemometrics

Ioana Feher, Cornelia Veronica Floare-Avram, Florina-Dorina Covaciu, Olivian Marincas, Romulus Puscas, Dana Alina Magdas, Costel Sarbu

Subject: Chemistry, Analytical Chemistry Keywords: mushrooms; FT-IR; chemometric; machine learning

Online: 28 September 2021 (21:36:05 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202109.0427.v1

Quality of Alcohol Based Hand Sanitizers Marketed in the Nairobi Metropolis

Kennedy Abuga, Nasser Nyamweya, Obed King’ondu

Subject: Chemistry, Analytical Chemistry Keywords: Hand sanitizer; COVID-19; alcohol; methanol substitution; gas chromatography; substandard products; falsified products; post-market surveillance

Online: 24 September 2021 (12:25:25 CEST)

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Working Paper ARTICLE

Utilizing a Rapid Multi-Plug Filtration Cleanup Method Determination of 72 Pesticides in Grape Wines by Gas Chromatography Tandem Mass Spectrometry

shaowen Liu, Aijuan Bai, Le Song, Nan Zou, Yongtao Han, Li Zhou, Chuanshan Yu, Canping Pan

Subject: Chemistry, Analytical Chemistry Keywords: Pesticide residue /GC- MS/MS/m-PFC/Wine

Online: 3 September 2021 (17:16:15 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202109.0048.v1

UHPLC-Orbitrap-HRMS Identification of 51 Oleraceins (Cyclo-Dopa Amides) in Portulaca oleracea L. Cluster Analysis and MS2 Filtering by Mass Difference

Yulian Voynikov, Paraskev Nedialkov, Reneta Gevrenova, Dimitrina Zheleva-Dimitrova, Vessela Balabanova, Ivan Dimitrov

Subject: Chemistry, Analytical Chemistry Keywords: orbitrap; purslane; oleracein; diagnostic ion; diagnostic difference; clustering methods

Online: 2 September 2021 (16:01:52 CEST)

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Preprint REVIEW | doi:10.20944/preprints202108.0383.v1

Carotenoids in Bacteria: Biosynthesis, Extraction, Characterization and Applications

Gerson-Dirceu López, Gerardo Álvarez-Rivera, Chiara Carazzone, Elena Ibañez, Chad Leidy, Alejandro Cifuentes

Subject: Chemistry, Analytical Chemistry Keywords: Bacterial carotenoids; Cell disruption; HPLC separation; MS analysis; Food and textile applications

Online: 18 August 2021 (14:09:35 CEST)

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Preprint COMMUNICATION | doi:10.20944/preprints202108.0196.v1

Complete Assignment of the ¹H and ¹³C NMR Spectra of Carthamin Potassium Salt Isolated from Carthamus Tinctorius L.

Maiko Sasaki, Keiko Takahashi

Subject: Chemistry, Analytical Chemistry Keywords: carthamin-3’potassium salt, green metallic luster, fermented safflower petal tablet

Online: 9 August 2021 (12:49:31 CEST)

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Preprint REVIEW | doi:10.20944/preprints202108.0133.v1

Organic Functionalized Carbon Nanostructures for Solar Energy Conversion

Luca Lazzarin, Mariacecilia Pasini, Enzo Menna

Subject: Chemistry, Analytical Chemistry Keywords: Carbon nanotubes, graphene, reduced graphene oxide, organic functionalization, dye, organic photovoltaics, dye sensitized solar cells, perovskite solar cells, photocatalytic hydrogen evolution

Online: 5 August 2021 (10:07:43 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202108.0132.v1

Effective Desalination of Acid Mine Drainage Using an Advanced Oxidation Process

Alexis Munyengabe, Caliphs Zvinowanda, John N. Zvimba, James Ramontja

Subject: Chemistry, Analytical Chemistry Keywords: Sodium ferrate (VI); Oxidation and Coagulation; Neutralization of AMD; Metal removal

Online: 5 August 2021 (09:44:18 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202108.0102.v1

Producing the most Significant Vital Gas for Humanity's Survival during Colonization of Other Planets by Using the Available Resources

Danial Karami

Subject: Chemistry, Analytical Chemistry Keywords: Oxygen generator; Carbon dioxide; Sabatier process; Astronauts; ISS

Online: 4 August 2021 (09:16:29 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202108.0100.v1

A Dansyl-Modified Sphingosine Kinase Inhibitor Dpf-543 Enhanced de Novo Ceramide Generation

Maftuna Shamshiddinova, Shokhid Gulyamov, Hee Jung Kim, Seo Hyeon Jung, Dong Jae Baek, Yong-Moon Lee

Subject: Chemistry, Analytical Chemistry Keywords: PF-543; ceramide; SPHK; SPT; ceramide synthases; sphingolipid; metabolism; LC-MS/MS.

Online: 4 August 2021 (08:32:59 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202108.0073.v1

How Ultrasonic-Assisted CO₂ EOR to Unlock Oils From Unconventional Reservoirs?

Hengli Wang, Leng Tian, Kaiqiang Zhang, Zongke Liu, Can Huang, Lili Jiang, Xiaolong Chai

Subject: Chemistry, Analytical Chemistry Keywords: Ultrasonic; Carbon dioxide; Enhanced oil recovery; Unconventional reservoirs

Online: 3 August 2021 (11:25:12 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202108.0014.v1

The Aerob and Anaerob Performance Beta-Alanine Supplement and Ergogenic Aid Using to the Power Output Variables in Cyclists: A Cohort Studies Random Model Effect

Yeliz Kahraman

Subject: Chemistry, Analytical Chemistry Keywords: Beta-alanine; supplementation; nutrition,; aerob and anaerob performance

Online: 2 August 2021 (10:18:40 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202107.0668.v1

Effect of Storage Conditions on the Quality of Arbequina Extra Virgin Olive Oil and the Impact on the Composition of Flavor-related Compounds (Phenols and Volatiles)

Leeanny Caipo, Ana Sandoval, Betsabet Sepúlveda, Edwar Fuentes, Rodrigo Valenzuela, Adam Metherel, Nalda Romero

Subject: Chemistry, Analytical Chemistry Keywords: olive oil; quality; storage conditions; phenols; volatile compounds; E-2-Nonenal

Online: 29 July 2021 (15:27:35 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202107.0631.v1

Combining Pressurized Liquid Extraction and Enzymatic-Assisted Extraction to Obtain Bioactive Non-Extractable Polyphenols from Sweet Cherry (Prunus avium L.) Pomace

Gloria Domínguez-Rodríguez, María Concepción García, María Luisa Marina, Merichel Plaza

Subject: Chemistry, Analytical Chemistry Keywords: pressurized liquid extraction; enzyme-assisted extraction; non-extractable polyphenols; proanthocyanidins; sweet cherry pomace

Online: 28 July 2021 (12:23:41 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202107.0521.v1

Cocaine Detection by a Laser-induced Immunofluorometric Biosensor

Martin Paul, Robert Tannenberg, Georg Tscheuschner, Marco Wilke, Michael G. Weller

Subject: Chemistry, Analytical Chemistry Keywords: Online detection, security; biosensor; flow injection assay; monoclonal antibody; fluorescence microscope; lab-on-a-chip; microfluidic systems; antibody labeling; CMOS; diode laser; monolithic column; laser-induced fluorescence detector (LIF); low-cost; high-speed; non-competitive immunoassay; immunometric assay

Online: 22 July 2021 (14:13:46 CEST)

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Working Paper ARTICLE

Absolute Absorption Cross Section of the Ã←X ̃ Electronic Transition of the Ethyl Peroxy Radical and Rate Constant of its Cross Reaction with HO2

Cuihong Zhang, Mirna Shamas, Mohamed Assali, Xiaofeng Tang, Weijun Zhang, Laure Pillier, Coralie Schoemaecker, Christa Fittschen

Subject: Chemistry, Analytical Chemistry Keywords: Peroxy radicals, near-infrared spectroscopy, Ã←X electronic transition, cavity ring down spectroscopy

Online: 21 July 2021 (16:19:16 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202107.0462.v1

Halogens in Acetophenones Direct the Hydrogen Bond Docking Preference of Phenol via Stacking Interactions

Charlotte Zimmermann, Manuel Lange, Martin A. Suhm

Subject: Chemistry, Analytical Chemistry Keywords: London dispersion; ketone complexes; density functional theory; hydrogen bonds; molecular recognition; vibrational spectroscopy; gas phase; benchmark

Online: 20 July 2021 (16:06:47 CEST)

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Working Paper ARTICLE

The Effect of Cluster Size on the Intra-Cluster Ionic Polymerization Process

Estefania Rossich Molina, Tamar Stein

Subject: Chemistry, Analytical Chemistry Keywords: acetylene; polycyclic aromatic hydrocarbons; interstellar medium; molecular growth; benzene; Ab initio molecular dynamics; van der Waals clusters; ion-molecule reactions; astrochemistry

Online: 20 July 2021 (10:21:00 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202107.0390.v1

Improvements in Gold Nanorod Biocompatibility with Sodium Dodecyl Sulfate Stabilization

Rossana Terracciano, Aobo Zhang, Mathieu L. Simeral, Danilo Demarchi, Jason H. Hafner, Carly S. Filgueira

Subject: Chemistry, Analytical Chemistry Keywords: Gold Nanorods; Theranostics; In vitro; Cancer; Cytotoxicity; CTAB; SDS; microCT; ICP-OES

Online: 16 July 2021 (16:36:52 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202107.0292.v2

Antibiotic Removal from Aquatic Environment with Activated Carbon Produced from the Pumpkin Seeds

İhsan Alacabey

Subject: Chemistry, Analytical Chemistry Keywords: Activated carbon; adsorption; ciprofloxacin; pollutant; pumpkin seed; thermodynamics

Online: 14 July 2021 (14:12:02 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202107.0327.v1

Modeling the Dual-function Effects of Hybrid-photopolymerization in Iodonium/Amine and Two Monomers System

Jui-Teng Lin

Subject: Chemistry, Analytical Chemistry Keywords: polymerization kinetics; photoinitiator; monomer conversion profile; synergetic effects.

Online: 14 July 2021 (12:03:25 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202107.0315.v1

Expanding the Myxochelin Natural Product Family by Nicotinic Acid Containing Congeners

Nicolas A. Frank, Márió Széles, Sergi H. Akone, Sari Rasheed, Stephan Hüttel, Simon Frewert, Mostafa M. Hamed, Jennifer Herrmann, Soeren M. M. Schuler, Anna K. H. Hirsch, Rolf Müller

Subject: Chemistry, Analytical Chemistry Keywords: Myxobacteria; myxochelin; nicotinic acid; secondary metabolites; natural product discovery; precursor-directed biosynthesis; total synthesis

Online: 14 July 2021 (10:03:32 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202107.0296.v1

Up-Dated the Critical Issues of Corneal Cross-Linking (Type-I and II): Safety Dose for Ultra-Thin Cornea, Role of Oxygen and Initiator Regeneration

Jui-Teng Lin

Subject: Chemistry, Analytical Chemistry Keywords: Corneal crosslinking; efficacy; kinetic modeling; oxygen; riboflavin; ultraviolet light; safety dose; minimum thickness.

Online: 13 July 2021 (11:19:16 CEST)

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Aims:To update analytic formulas for the overall efficacy of corneal collagen crosslinking (CXL) including both type-I and oxygen-mediated type-II mechanisms, the role of oxygen and the initiator regeneration. Study Design:modeling the kinetics of CXL in UV light and using riboflavin as the photosensitizer.Place and Duration of Study:New Taipei City, Taiwan, between June, 2021 and July, 2021.Methodology:Coupled kinetic equations are derived under the quasi-steady state condition for the 2-pathway mechanisms of CXL. For type-I CXL, the riboflavin (RF) triplet state [T] may interact directly with the stroma collagen substrate [A] to form radical (R) and regenerate initiator. For type-II process, [T] interacts with oxygen to form a singlet oxygen [¹O₂]. Both reactive radical (R) and [¹O₂], can relax to their ground state, or interact with the substrate [A]) for crosslinking. Based on a safety dose, the minimum corneal thickness formula is derived. Results:Our updated theory/modeling showed that oxygen plays a limited and transient role in the process, in consistent with that of Kamave [2]. In contrary, Kling et al [3] believed that type-II is the predominant mechanism, which however conflicting with the epi-on CXL results. For both type-I and type-II, a transient state conversion (crosslink) efficacy in an increasing function of light intensity (or dose), whereas, its steady state efficacy is a deceasing function of light intensity. RF depletion in type-I is compensated by the RF regeneration term (RGE) which is a decreasing function of oxygen. For the case of perfect regeneration case (or when oxygen=0), RF is a constant due to the catalytic cycle. Unlike the conventional Dresden rule of 400 um thickness, thin cornea CXL is still safe as far as the dose is under a threshold dose (E*), based on our minimum thickness formula (Z*). Our formula for thin cornea is also clinically shown by Hafez et al forultra thin (214 nm) CXL. Conclusion: For both type-I and type-II, a transient state conversion (crosslink) efficacy in an increasing function of light intensity (or dose), whereas, its steady state efficacy is a deceasing function of light intensity. Ultra thin cornea is still safe as far as it is under a threshold dose (E*), based on our minimum thickness formula.

Preprint ARTICLE | doi:10.20944/preprints202107.0292.v1

Antibiotic Removal from Aquatic Environment with Activated Carbon Produced from the Pumpkin Seeds

İhsan Alacabey

Subject: Chemistry, Analytical Chemistry Keywords: Activated carbon; adsorption; ciprofloxacin; pollutant; pumpkin seed; thermodynamics

Online: 13 July 2021 (11:14:31 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202107.0284.v1

Partitioning Entropy with Action Mechanics: Predicting Chemical Reaction Rates and Gaseous Equilibria of Reactions of Hydrogen from Molecular Properties

Ivan R. Kennedy, Migdat Hodzic

Subject: Chemistry, Analytical Chemistry Keywords: entropy; enthalpy; equilibrium; ergal; free energy; Gibbs energy; Haber process; Helmholtz energy; hydrogen dissociation; transition state; water dissociation; virial theorem

Online: 13 July 2021 (09:57:00 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202107.0278.v1

Characterization and Investigation of Stigmasterol Isolated from Rodent Tuber Mutant Plant (Typhonium flagelliforme), Its Molecular Docking as Anticancer on MF-7 Cells

Nesti Fronika Sianipar, Yuni Elsa Hadisaputri, Khoirunnisa Assidqi, Supriatno Salam, Muhammad Yusuf, Wanda Destiarani, Ragapadmi Purnamaningsih, Idris Gautama So

Subject: Chemistry, Analytical Chemistry Keywords: Typhonium flagelliforme; MCF-7 cell line; stigmasterol; agonistic; mutant plant

Online: 13 July 2021 (08:27:04 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202107.0274.v1

Efficacy Analysis and Kinetics of 3-Component Photopolymerization by Visible-LED/Coumarin and Enhanced by Additives of Iodonium Salt and Amine

Jui-Teng Lin, Jacques Lalevee, Da-Chun Cheng

Subject: Chemistry, Analytical Chemistry Keywords: polymerization kinetics; photoinitiator; free radical polymerization; photo-oxidation; 3D printing.

Online: 12 July 2021 (22:22:54 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202107.0270.v1

Computer-aided Design of Peptidomimetic Inhibitors of falcipain-3: QSAR and Pharmacophore Models

Boris D. Bekono, Akori Esmel, Brice Dali, Fidele Ntie-Kang, Melalie Keita, Luc Calvin Owono Owono, Eugene Megnassan

Subject: Chemistry, Analytical Chemistry Keywords: drug design; falcipain; malaria; peptidomimetics; Plasmodium falciparum; virtual screening; pharmacophore.

Online: 12 July 2021 (14:48:13 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202107.0213.v1

A Laser Reduced Graphene Oxide Grid Electrode for the Voltammetric Determination of Carbaryl

Muhammad Saqib, Elena V. Dorozhko, Jiri Barek, Vlastimil Vyskocil, Elena Korotkova, Anastasiia Shabalina

Subject: Chemistry, Analytical Chemistry Keywords: laser reduced graphene oxide, grid electrode, graphene oxide, linear sweep voltammetry, carbaryl, pesticides.

Online: 9 July 2021 (10:15:49 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202107.0196.v1

Macrocyclic Tetramers – Structural Investigation of Peptide-Peptoid Hybrids

Claudine Herlan, Anna Sonnefeld, Thomas Gloge, Julian Brückel, Luisa Schlee, Claudia Muhle-Goll, Martin Nieger, Stefan Bräse

Subject: Chemistry, Analytical Chemistry Keywords: peptidomimetics; tetramers; macrocycles; spatial structure.

Online: 8 July 2021 (10:59:08 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202107.0195.v1

Loop-Mediated Isothermal Amplification in Core-Shell Beads Assay for the Detection of Tyrosine Kinase AXL Over Expression

Kamalalayam Rajan Sreejith, Muhammad Umer, Pradip Singha, Nhat-Khuong Nguyen, Surasak Kasetsirikul, Chin Hong Ooi, Muhammad Shiddiky, Nam-Trung Nguyen

Subject: Chemistry, Analytical Chemistry Keywords: Loop-mediated isothermal amplification; AXL over expression; core-shell beads assay

Online: 8 July 2021 (10:57:31 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202107.0190.v1

A Natural Degradant of Curcumin, Feruloylacetone Inhibits Cell Proliferation via Inducing Cell Cycle Arrest and a Mitochondrial Apoptotic Pathway in HCT116 Colon Cancer Cells

Yu-Ting Chou, Yen-Chun Koh, Kalyanam Nagabhushanam, Chi-Tang Ho, Min-Hsiung Pan

Subject: Chemistry, Analytical Chemistry Keywords: Feruloylacetone; demethoxy-feruloylacetone; colon cancer; curcumin; degradant

Online: 8 July 2021 (10:06:19 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202107.0181.v1

A Paper-based Immunofluorescent Device for the Detection of SARS-CoV-2 Humanized Antibody

Surasak Kasetsirikul, Muhammad Umer, Narshone Soda, Kamalalayam Rajan Sreejith, Muhammad J. A. Shiddiky, Nam-Trung Nguyen

Subject: Chemistry, Analytical Chemistry Keywords: SARS-CoV-2 detection; Immunofluorescence; Paper-based diagnostic device

Online: 7 July 2021 (13:18:33 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202107.0159.v1

On the Applicability of Electrophoresis for Protein Quantification

Karina Dome, Zoya Akimenko, Aleksey Bychkov, Yuri Kalambet, Oleg Lomovsky

Subject: Chemistry, Analytical Chemistry Keywords: electrophoresis; protein; mechanical treatment; quantification

Online: 6 July 2021 (14:54:12 CEST)

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Preprint REVIEW | doi:10.20944/preprints202005.0060.v3

Fighting the SARS CoV-2 (COVID-19) Pandemic with Soap

Narendra Kumar Chaudhary, Nabina Chaudhary, Manis Dahal, Biswash Guragain, Sumie Rai, Rahul Chaudhary, K.M. Sachin, Reena Lamichhane-Khadka, Ajaya Bhattarai

Subject: Chemistry, Analytical Chemistry Keywords: COVID-19; SARS-Cov-2; soap; hand washing; WHO

Online: 6 July 2021 (11:30:53 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202107.0033.v1

Quantifying Conformational Isomerism in Chain Molecules by Linear Raman Spectroscopy: The Case of Methyl Esters

Maxim Gawrilow, Martin A. Suhm

Subject: Chemistry, Analytical Chemistry Keywords: Raman intensity; anharmonicity; conformational isomerism; chain folding; jet cooling; rotational band contour; esters

Online: 1 July 2021 (14:22:39 CEST)

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Preprint REVIEW | doi:10.20944/preprints202107.0031.v1

Recent Progress of SERS Nanoprobe for pH Detecting and its Application in Biological Imaging

Lei Zhang, Qianqian Zhao, Zhitao Jiang, Jingjing Shen, Weibing Wu, Xingfen Liu, Quli Fan, Wei Huang

Subject: Chemistry, Analytical Chemistry Keywords: pH; SERS; probe; detection; imaging

Online: 1 July 2021 (14:17:48 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202106.0735.v1

Discovery of a Novel Tetrapeptide Against Influenza A Virus: Rational Design, Synthesis, Bioactivity Evaluation and Computational Studies

Maria Carmina Scala, Mariangela Agamennone, Agostina Pietrantoni, Veronica Di Sarno, Alessia Bertamino, Fabiana Superti, Pietro Campiglia, Marina Sala

Subject: Chemistry, Analytical Chemistry Keywords: Influenza A virus; lactoferrin; tetrapeptides; biophysics; antiviral agents; hemagglutinin

Online: 30 June 2021 (11:59:07 CEST)

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Working Paper ARTICLE

Effect of B Incorporation on the SiOC Precursor Fabrication and High-temperature Oxidation Behavior of SiBOC Ceramics

Zhenjie Sun, Hongzhao Xu, Fang Yuan, Shanbao Zhou, Haiou Zhou, Wenbo Han

Subject: Chemistry, Analytical Chemistry Keywords: polymer-derived ceramics; SiBOC ceramics; sol-gel method; oxidation resistance

Online: 30 June 2021 (09:40:52 CEST)

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Preprint REVIEW | doi:10.20944/preprints202106.0700.v1

Recent Advances in Electrochemical Chitosan-Based Chemosensors and Biosensors: Applications in Food Safety

Rita Petrucci, Mauro Pasquali, Francesca Anna Scaramuzzo, Antonella Curulli

Subject: Chemistry, Analytical Chemistry Keywords: chitosan; nanomaterials; electrochemical chemosensors; electrochemical biosensors; food safety

Online: 29 June 2021 (11:53:15 CEST)

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Working Paper ARTICLE

Biocatalytic Silylation: The Condensation of Phenols and Alcohols with Triethylsilanol

Emily I. Sparkes, Chisom S. Egedeuzu, Billie Lias, Rehana Sung, Stephanie A. Caslin, S. Yasin Tabatabaei Dakhili, Peter G. Taylor, Peter Quayle, Lu Shin Wong

Subject: Chemistry, Analytical Chemistry Keywords: Silicatein; condensation; silyl ether; organosiloxane; biocatalysis

Online: 28 June 2021 (13:43:42 CEST)

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Preprint CONCEPT PAPER | doi:10.20944/preprints202106.0644.v1

Atoms vs. Ions: Intermediates in Reversible Electrochemical Hydrogen Evolution Reaction

Jurga Juodkazyte, Kestutis Juodkazis, Saulius Juodkazis

Subject: Chemistry, Analytical Chemistry Keywords: H2ER, H2OR, HER, HOR, hydrogen, hydrogen molecular ion H2+, reversible process

Online: 28 June 2021 (11:48:21 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202106.0582.v1

Efficacy Analysis of Panchromatic New Copper Complex for Visible Light (455, 530 nm) Radical/Cationic Photopolymerization: The Synergic Effects and Catalytic Cycle

Jui-Teng Lin, Jacques Lalevee, Da-Chun Cheng

Subject: Chemistry, Analytical Chemistry Keywords: polymerization kinetics; free radical, cationic polymerization, copper complex, photoredox catalyst.

Online: 23 June 2021 (12:37:02 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202106.0576.v1

Neuroprotective Efficacy of Folecitin From Hypericum Oblongifolium Against LPS-Induced Oxidative Stress, Neurodegeneration, and Memory Dysfunction

Umar Farooq, Shahid Ali Shah, Taous Khan, Rahim Ullah, Naila Raziq, Muhammad Shahid, Ameer Khusro, Muhammad Umar Khayam Sahibzada, Veronique Seidel, Adel Alkhedaide, Gaber El-Saber Batiha, Niranjan Koirala

Subject: Chemistry, Analytical Chemistry Keywords: Hypericum oblongifolium; Alzheimer’s disease; Folecitin; Memory impairment; Neurodegenerative disease; Neuroprotection

Online: 23 June 2021 (11:25:28 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202106.0572.v1

Base-Mediated Claisen Rearrangement of CF3-Containing Bisallyl Ethers

Yoko Hamada, Rio Matsunaga, Tomoko Kawasaki-Takasuka, Takashi Yamazaki

Subject: Chemistry, Analytical Chemistry Keywords: Claisen rearrangement; isomerization; trifluoromethyl; Cieplak rule

Online: 23 June 2021 (11:16:15 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202106.0516.v1

Morphological Transformation of SDS Aggregates in a Deep Eutectic Solvent Above the Fracto-eutectogel to Fluid Transition Temperature

Lauren Matthews, Sarah E.S. Michel, Sarah E. Rogers, Paul Bartlett, Andrew J. Johnson, Robert Sochon, Wuge H. Briscoe

Subject: Chemistry, Analytical Chemistry Keywords: Deep eutectic solvents (DES); glyceline; surfactant mesophases; nonaqueous H-bonding solvents; small-angle neutron scattering (SANS); self-assembly; cylindrical micelles; spherical micelles; dendrites; fractals

Online: 21 June 2021 (14:15:42 CEST)

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Working Paper ARTICLE

Second Derivative as a Function of the Transition State and Noncovalent Interactions: Implementation of Graphic Methodology in Electrophilic Aromatic Substitution Mechanistic Analysis

Janez Cerkovnik, Nikola Stamenković

Subject: Chemistry, Analytical Chemistry Keywords: Second-Order Derivative (SOD) method; Graphic method; Potential Energy Scan (PES); Charge-Transfer complex; Iron(III) bromide; Iron(V) complex; Transition metal-halogen tandem catalysis

Online: 21 June 2021 (14:08:50 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202106.0502.v1

Efficacy Modeling of New Multi-Functional Benzophenone-Based System for Free-Radical/Cationic Hybrid Photopolymerization Using 405 nm LED

Jui-Teng Lin, Jacques Lalevee

Subject: Chemistry, Analytical Chemistry Keywords: polymerization kinetics; conversion efficacy; free radical and cationic radical; benzophenone–triphenylamine amine; photoredox catalyst; 3D bioprinting

Online: 21 June 2021 (10:37:40 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202106.0499.v1

Substrate-Solvent Crosstalk – Effects on Reaction Kinetics and Product Selectivity in Olefin Oxidation Catalysis

Rita N. Sales, Sam K. Callear, Pedro D. Vaz, Carla D. Nunes

Subject: Chemistry, Analytical Chemistry Keywords: Oxidation catalysis; Neutron diffraction; Molybdenum; Mesoporous materials; Hydrogen bonds

Online: 21 June 2021 (10:21:57 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202106.0451.v1

Hydrochloric Acid Modification and Lead Removal Studies on Naturally Occurring Zeolites from Nevada, New Mexico, and Arizona.

Garven M Huntley, Rudy Lin Luck, Michael E Mullins, Nick K Newberry

Subject: Chemistry, Analytical Chemistry Keywords: Clinoptilolites; Acid modification; heavy metals; toxic substances; purification; lead removal.

Online: 17 June 2021 (09:14:51 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202106.0424.v1

Efficacy Analysis of In Situ Synthesis of Nanogold via Copper/Iodonium/Amine/Gold System Under a Visible Light

Jui-Teng Lin, Jacques Lalevee, Haja Tar, Da-Chun Cheng

Subject: Chemistry, Analytical Chemistry Keywords: polymerization kinetics; photoinitiator; free radical polymerization; copper complex; photoredox catalyst; nanogold particles

Online: 16 June 2021 (08:37:27 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202106.0411.v1

Synthesis and Electrochemical Performance of Electrostatic Self-Assembled Nano-Silicon@N-Doped Reduced Graphene Oxide/Carbon Nanofibers Composite as Anode Material for Lithium-Ion Batteries

Ruye Cong, Hyun-Ho Park, Minsang Jo, Hochun Lee, Chang-Seop Lee

Subject: Chemistry, Analytical Chemistry Keywords: lithium-ion battery; silicon nanoparticles; nitrogen-doped graphene; carbon nanofibers; anode material

Online: 15 June 2021 (14:48:47 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202106.0395.v1

Nutritional, Textural, and Sensory Quality of Aloe Vera Leaf Gel Powder Fortified Plain Cake

Dhrubajyoti Singha, Md. F. Jubayer, Kumkum Devanath, Delara Akhter, Thottiam Vasudevan Ranganathan, Md. T. Rahman, Md. Anisur Rahman Mazumder

Subject: Chemistry, Analytical Chemistry Keywords: Aloe Vera; cake; minerals; polyphenol; antioxidant; texture.

Online: 15 June 2021 (11:04:27 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202106.0387.v1

Construction, Molecular Docking, Antimicrobial and Antioxidant Activity of Some Novel 3-Substitued Indole Derivatives Using 3-Acetyl Indole

Amira Ghoneim, Alanoud Al-Khaldi, Mervat Ahmed El-sherif, Rehab Elbargisy, Heba Bassiony Ghanem, Rehman Zafar

Subject: Chemistry, Analytical Chemistry Keywords: 3-Acetyl indole; Biological Evaluations; Molecular Docking; thioglycollic acid; ethylene diamine and hydrazine hydrate

Online: 15 June 2021 (08:57:00 CEST)

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Preprint REVIEW | doi:10.20944/preprints202106.0350.v1

A Review on Green Synthesis and Biological Activities of Nitrogen and Oxygen Containing Heterocycles

Susheel Gulati, Rajvir Singh, Suman Sangwan

Subject: Chemistry, Analytical Chemistry Keywords: Heterocycles; Coumarins; Dihyfropyrimidinones; Imidazoles; Isoxazoles; Benzimidazoles; Green Chemistry

Online: 14 June 2021 (10:39:56 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202106.0308.v1

Modifications in the Composition of CuO/ZnO/Al₂O₃ Catalyst for the Synthesis of Methanol by CO₂ Hydrogenation

Bianca Trifan, Javier Lasobras, Jaime Soler, Javier Herguido, Miguel Menéndez

Subject: Chemistry, Analytical Chemistry Keywords: CO2 hydrogenation; Methanol synthesis; Cu/ZnO catalyst; Pd catalyst; Energy storage

Online: 11 June 2021 (09:06:15 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202106.0306.v1

Behaviour of Ternary Mixtures of Hydrogen Bond Acceptors and Donors in Terms of Band Gap Energies

Alberto Mannu, Francesca Cardano, Salvatore Baldino, Andrea Fin

Subject: Chemistry, Analytical Chemistry Keywords: eutectic mixtures; hydrogen bond acceptor; hydrogen bond donor; design of experiments; Tauc plot; band gap energy

Online: 11 June 2021 (08:52:30 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202106.0245.v1

A Comprehensive Biological and Physico-Chemical Characterization of Humic and Fulvic Acids Nanoparticles as a Perspective Drug

Elena V. Valer'evna Uspenskaya, Tatiana Vadimovna Pleteneva, Tatiana Vladimirovna Grebennikova, Ilaha Vagifovna Kazimova, Irina Timofeevna Fedyakina, Varvara Victorovna Lebedeva, Oleg Evgen'evich Latyshev, Olesia Vasil'evna Eliseeva, Viktor Filippovich Larichev, Timur Mansurovich Garaev, Tatiana Vladimirovna Maximova, Mariya Andreevna Morozova, Pham My Hang, Anton Vladimirovich Syroeshkin

Subject: Chemistry, Analytical Chemistry Keywords: extract of humic substances; fulvic acid; standardization; nanoparticles of polyelectrolytes; antiviral activity; SARS-CoV-2; VERO-E6; Spirotox-method

Online: 9 June 2021 (07:42:16 CEST)

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This work presents the results of a comprehensive physico-chemical and biological study of hu-mic substances samples – an extract of humic and fulvic acids. The performed loss on drying test showed a 22 times different dry matter content between EHS and FA. The morphology and dis-tribution of particles in the dry residue of the samples assessed using the methods of optical and digital microscopy demonstrated differences in the qualitative features of the microstructures of their surfaces and granulometries. Shimadzu X-ray fluorescence spectrometry revealed Si (8.1 and 1.7%), P (33.5 and 2.7%), S (4.3 and 59.5%), K (1.35 and 2.5%), Ca (10.9 and 3.2%), Mn (0.27 and 0.06%), Fe (11 and 0.05%), Cu (0.16 and 0.45%), Zn (0.06 and 0.02%) in the dry residues of the EHS and FA samples, respectively. A high intensity of the X-ray fluorescence signal for Fe atoms in the EHS sample was demonstrated. The FT-IR spectra for EHS and FA are characterized by simi-lar vibration frequencies that are characteristic of the chromone derivatives (1-benzopyran-4-one). The UV absorption spectrum is characterized by max = 281 nm for FA. The EHS solution showed a fluorescence maximum at em = 560 nm at ex = 280 nm. Using the DLS method, nanoparticles of 1 nm and 200 nm were detected in EHS and FA diluted solutions, which are likely to condition the biochemical and physical properties of humic acids. Using the Spiro-tox-test method, the absence of the toxic effect of humic acids on the cell model of ciliates Sp. am-bigua was established. When the cell model was incubated in a solution of a toxicant of the fluo-roquinolone group, a decrease in toxicity was demonstrated when diluted with the EHS solu-tion. The results of the study of the antiviral activity of EHS and FA showed that the study ob-jects in the culture of Vero-E6 cells, in doses non-toxic to cells, suppress the reproduction of the SARS-CoV-2 virus both in the study of the virucidal effect and in the study of the antiviral activ-ity according to the therapeutic and prophylactic model scheme of injection. The results obtained suggest that standardized drugs based on humic acids may open up new perspectives in their biomedical application as antiviral drugs.

Preprint REVIEW | doi:10.20944/preprints202106.0032.v1

Backhousia citriodora F. Muell. (Lemon Myrtle), an Unrivaled Source of Citral

Ian Southwell

Subject: Chemistry, Analytical Chemistry Keywords: Backhousia citriodora; lemon myrtle; lemon oils; citral; geranial; neral; iso-citrals; citronellal; flavour; fragrance; biological activity

Online: 1 June 2021 (12:23:28 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202105.0784.v1

New (Iso)Quinolinyl-Pyridine-2,6-dicarboxamide G-Quadruplex Ligands. A Structure-Activity Relationship Study

Enrico Cadoni, Pedro R. Magalhães, Rita M. Emídio, Eduarda Mendes, Jorge B. Vítor, Josué Carvalho, Carla Cruz, Bruno L. Victor, Alexandra Paulo

Subject: Chemistry, Analytical Chemistry Keywords: Quinoline; Isoquinoline; G-Quadruplex ligands; k-RAS; c-MYC; telomere; SAR; pyri-dine-dicarboxamide; molecular dynamics

Online: 31 May 2021 (14:03:28 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202105.0776.v1

Determination of Eleven Veterinary Drugs in Chicken Meat and Liver

Caue Sousa Novo, Amanda Barros, Vivian Feddern, Arlei Coldebella, Gerson Neudi Scheuermann

Subject: Chemistry, Analytical Chemistry Keywords: broiler; feed additives; LC-MS; poultry meat; veterinary drugs

Online: 31 May 2021 (13:33:27 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202105.0773.v1

Fermentation Dynamics of Ethiopian Traditional Beer (Tella) As Influenced by Substitution of Gesho (Rhamnus prinoides) With Moringa Stenopetala as Innovation for Nutrition

Ajanw Maru Birhanu, Tadesse Fikre Teferra, Tesfu Bekele lema

Subject: Chemistry, Analytical Chemistry Keywords: Ethnic beer; borde; shamita; keribo; korefe; indigenous drinks; fermented beverages; probiotics; Farsoo; moringa

Online: 31 May 2021 (12:50:33 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202105.0724.v1

Functionalization of Photosensitized Silica Nanoparticles for Advanced Photodynamic Therapy of Cancer

Ruth Prieto-Montero, Alejandro Prieto-Castañeda, Alberto Katsumiti, Miren P. Cajaraville, Antonia R. Agarrabeitia, María J. Ortiz, Virginia Martínez-Martínez

Subject: Chemistry, Analytical Chemistry Keywords: BODIPY-based photosensitizers; functionalized silica nanoparticles; folic acid; PEG; photodynamic therapy; HeLa cells; (photo) toxicity

Online: 31 May 2021 (09:58:40 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202105.0719.v1

Palladium-Catalyzed Dehydrogenative C-2 Alkenylation of 5-Arylimidazoles and Related Azoles with Styrenes

Marco Lessi, Attilio Nania, Melania Pittari, Laura Lodone, Angela Cuzzola, Fabio Bellina

Subject: Chemistry, Analytical Chemistry Keywords: C-H activation; imidazoles; Fujiwara-Moritani reaction; dehydrogenative coupling; oxidative Heck coupling; styrenes; palladium catalysis; copper salts

Online: 31 May 2021 (09:14:12 CEST)

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Preprint COMMUNICATION | doi:10.20944/preprints202105.0701.v1

Taxonomy-focused Natural Product Databases for Carbon-13 NMR-based Dereplication

Jean-Marc Nuzillard

Subject: Chemistry, Analytical Chemistry Keywords: Natural products; databases; dereplication; taxonomy; NMR

Online: 28 May 2021 (12:59:37 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202105.0687.v1

Gold-conjugated Nanobodies for Targeted Imaging using High-resolution Secondary Ion Mass Spectrometry

Paola Agüi-Gonzalez, Tal M. Dankovich, Felipe Opazo, Silvio O. Rizzoli, Nhu T.N. Phan

Subject: Chemistry, Analytical Chemistry Keywords: nanobodies; gold nanoparticles; target imaging; nanoSIMS; SIMS

Online: 28 May 2021 (09:57:12 CEST)

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Working Paper ARTICLE

Photocatalysis Over N-Doped TiO2 Driven by Visible Light as a New Method for Pb(II) Removal

Endang Tri Wahyuni, Titi Rahmaniati, Aulia Rizky Hafidzah, Suherman Suherman, Adhitasari Suratman

Subject: Chemistry, Analytical Chemistry Keywords: doping N; TiO2; Pb(II); photocatalytic-oxidation; visible light

Online: 27 May 2021 (07:49:06 CEST)

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Working Paper ARTICLE

Antioxidant Potential of Aqueous Dispersions of Fullerenes C₆₀, C₇₀, and Gd@C₈₂

Ivan V. Mikheev, Madina M. Sozarukova, Dmitry Yu. Izmailov, Ivan E. Kareev, Elena V. Proskurnina, Mikhail A. Proskurnin

Subject: Chemistry, Analytical Chemistry Keywords: Fullerene; Endofullerene; Aqueous Fullerene Dispersion; Antioxidant Potential; Kinetic Chemiluminometry

Online: 26 May 2021 (14:19:39 CEST)

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Working Paper REVIEW

Synergic Kinetics and Strategies for Enhanced Photopolymerizations for 3d-Printing and Additive Manufacturing - A Critical Review

Jui-Teng Lin, Jacques Lalevee, Da-Chun Cheng

Subject: Chemistry, Analytical Chemistry Keywords: 3D printings; additive manufacturing; polymerization kinetics; photoredox; monomer conversion; synergic effects; cationic; free radical. UV visible light.

Online: 26 May 2021 (13:29:11 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202105.0610.v1

Natural Changes in a Soil of the Mediterranean Climate Under Low Agronomic Inputs

Antonietta Napolitano, Luigi Santonicola

Subject: Chemistry, Analytical Chemistry Keywords: nitrates; moisture; organic matter

Online: 25 May 2021 (13:01:54 CEST)

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CHEMISTRY