Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Ultrasound Assisted Alkaline Pretreatment of Biomass to Enhance the Extraction Yield of Valuable Chemicals

Adina I. Gavrila
ORCID logo ,
Anamaria Vartolomei
,
Ioan Calinescu
,
Mircea Vinatoru
,
Oana C. Parvulescu
,
Grigore Psenovschi
,
Petre Chipurici
* ,
Adrian Trifan
*
Version 1 : Received: 8 April 2024 / Approved: 8 April 2024 / Online: 8 April 2024 (15:38:08 CEST)

A peer-reviewed article of this Preprint also exists.

Gavrila, A.I.; Vartolomei, A.; Calinescu, I.; Vinatoru, M.; Parvulescu, O.C.; Psenovschi, G.; Chipurici, P.; Trifan, A. Ultrasound-Assisted Alkaline Pretreatment of Biomass to Enhance the Extraction Yield of Valuable Chemicals. Agronomy 2024, 14, 903. Gavrila, A.I.; Vartolomei, A.; Calinescu, I.; Vinatoru, M.; Parvulescu, O.C.; Psenovschi, G.; Chipurici, P.; Trifan, A. Ultrasound-Assisted Alkaline Pretreatment of Biomass to Enhance the Extraction Yield of Valuable Chemicals. Agronomy 2024, 14, 903.

Abstract

Lignocellulosic biomass, an abundant and renewable resource, serves as a crucial raw material for the production of biofuels, biochemicals, and various value-added products. This paper aims to develop and optimize a mild alkaline treatment of sawdust assisted by ultrasound, along with enzymatic hydrolysis of the pretreated material. The sonochemical pretreatment with alkali emerged as the optimal approach to enhance the susceptibility of cellulose to subsequent enzymatic hydrolysis, thereby increasing the yield of reducing sugars. A comparative study was performed using various ultrasonic applicators (horn and bath) and conventional assisted alkaline pretreatment. The ultrasonic assisted pretreatment revealed a higher delignification as 68% (horn) and 57% (bath) comparing with conventional pretreatment. Processes were optimized using a statistical analysis based on a 23 factorial design. The ratio between sawdust and alkanine solution (RSL = 0.5–1.5 g/100 mL), US amplitude (A = 20–60%), and working temperature (t = 30–50 °C) were selected as process factors. The optimal operating conditions to maximize the reducing sugar yield (138.15 mg GE /gsubstrate) were found as following: solid/liquid ratio RSL,opt = 1.25 g/100 mL, US amplitude Aopt = 60%, and and pretreatment temperature topt = 50 °C. The overall outcomes clearly confirmed the intensification of delignification by ultrasound assisted alkaline pretreatment

Keywords

ultrasound; lignin; wood residue; enzymatic hydrolysis

Subject

Biology and Life Sciences, Agricultural Science and Agronomy

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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