Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Investigation of Selective Extraction of Phenolic Compounds and of Saccharides From Picea Abies Bark Using Organosolv Solvents

Version 1 : Received: 4 October 2021 / Approved: 6 October 2021 / Online: 6 October 2021 (09:05:17 CEST)

How to cite: Zeppetzauer, F.; Nadányi, R.; Kamm, B.; Putz, R.; Lisý, A.; Šurina, I. Investigation of Selective Extraction of Phenolic Compounds and of Saccharides From Picea Abies Bark Using Organosolv Solvents. Preprints 2021, 2021100095 (doi: 10.20944/preprints202110.0095.v1). Zeppetzauer, F.; Nadányi, R.; Kamm, B.; Putz, R.; Lisý, A.; Šurina, I. Investigation of Selective Extraction of Phenolic Compounds and of Saccharides From Picea Abies Bark Using Organosolv Solvents. Preprints 2021, 2021100095 (doi: 10.20944/preprints202110.0095.v1).

Abstract

Enormous quantities of softwood and hardwood tree bark are generated yearly in the pulp and woodworking industry. Chemical compounds which can be found in bark extracts have important biological properties and therefore a high potential for using in the production of special formulations. In the present study, extraction of Picea abies bark with organosolv solvents was investigated to achieve a high yield of desirable compounds. For the extraction four different solvent ratios of ethanol and water were applied. The temperature range of extraction was set between 40 and 100 °C and stirring velocity of 400 rpm. Extractions were performed with a solid/liquid ratio of 1:20. Yields of phenolics, flavonoids and tannins were determined using gallic acid for total phenolic content (TPC), quercetin for total flavonoid content (TFC) and tannic acid for total tannins content (TTC) as calibration compounds. Qualitative analysis of phenolic constituents was performed after their derivatization, by gas chromatography coupled with mass spectrometry identification. The total yield of bark extract of 14.75 wt.% was achieved by using an ethanol/water ratio of 50% (v/v) and a temperature of 100 °C. Gas chromatography results show 9 aromatic carboxylic acids as phenolic acids and quercetin and (+)-catechin as flavonoid compounds. Highest concentrations of TPC = 3.21 mg gallic acid equivalent/g, TCF = 0.62 mg quercetin equivalent/g and TTC = 0.84 tannic acid equivalent/g were determined at the same process conditions by photometric method. This study determined the conditions for organosolv extraction of useful compounds and suggests that some of extractives, e.g., taxifolin and rhamnetin presented in the spruce bark extracts, have antiviral (SARS-CoV-2) effects. Therefore, this warrants further evaluation of the antiviral properties of spruce bark constituents.

Keywords

Phenolic compounds; organosolv extraction; spruce bark; Picea abies; GC-MS identification; Total phenolic content; Total flavonoid content; Total tannins content; Saccharide’s content; antiviral properties

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