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Comparison of lactic and propionic acid hydrolysis for production of xylo-oligosaccharides and ethanol from polysaccharides in Toona sinensis branch

Xylan-type hemicellulose hydrolysis by an organic acid solution for the production of xylo-oligosaccharides (XOS) is efficient and eco-friendly, but the effects of different organic acids on XOS production from Toona sinensis branch (TB) biomass is limited. In this work, under the conditions of 170 ...

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Published in:International journal of biological macromolecules 2024-06, Vol.270, p.132339-132339, Article 132339
Main Authors: Lin, Jiayi, Wen, Peiyao, Ying, Wenjun, Yu, Juan, Zhang, Junhua
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Yu, Juan
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description Xylan-type hemicellulose hydrolysis by an organic acid solution for the production of xylo-oligosaccharides (XOS) is efficient and eco-friendly, but the effects of different organic acids on XOS production from Toona sinensis branch (TB) biomass is limited. In this work, under the conditions of 170 °C for 60 min, 33.1 % and 38.7 % XOS yields were obtained from polysaccharides present in TB by 2 % lactic acid (LA) and 6 % propionic acid (PA), respectively. Then 77 % of the lignin was removed by hydrogen peroxide−acetic acid pretreatment system, and 39.5 % and 44.7 % XOS yield were obtained from polysaccharides in delignification TB by 2 % LA and 6 % PA, respectively. It was found that PA hydrolysis, especially from delignified TB, resulted in higher XOS yield and purity compared to LA hydrolysis. Moreover, the content of byproducts (xylose, hydroxymethyl-furfural and furfural) in PA hydrolysate was lower. Following the hydrolysis process, the simultaneous saccharification and fermentation of the TB solid residue achieved an ethanol yield of 71.5 %. This work proposed an integrated process to preferentially convert the TB hemicellulose into valuable XOS and then convert the cellulose into ethanol. This process had the advantages of eliminating the need for isolation and purification of xylan, and the potential to obtain multiple products from the same raw material. [Display omitted] •Toona sinensis branch (TB) was firstly used to produce xylo-oligosaccharides (XOS).•A high XOS yield of 44.7 % was obtained from delignified TB using propionic acid.•Delignification of TB resulted in a relatively high purity of XOS.•71.5 % ethanol yield was achieved by simultaneous saccharification fermentation.
doi_str_mv 10.1016/j.ijbiomac.2024.132339
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subjects Cellulose
Delignification
Hemicellulose
Organic acid hydrolysis
TB biomass
title Comparison of lactic and propionic acid hydrolysis for production of xylo-oligosaccharides and ethanol from polysaccharides in Toona sinensis branch
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