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- W4287509868 abstract "Abstract Background: Biochemical conversion of lignocellulose typically includes hydrothermal pretreatment, enzymatic saccharification of cellulose, fermentation of sugars, and valorization of the lignin-rich residue. However, by-products from the hydrothermal pretreatment of the lignocellulosic biomass inhibit enzymatic saccharification and microbial fermentation. Conditioning of slurries or hydrolysates is used to alleviate inhibition problems and make subsequent bioprocessing steps more efficient. Results: Three long-chain organic extractants (Alamine 336, Aliquat 336, and Cyanex 921) were compared to two conventional organic solvents (ethyl acetate and xylene) with regard to conditioning of birch wood pretreatment liquid (BWPL) for improved saccharification and fermentation. Removal of by-products typically increased in the order Alamine 336 < Cyanex 921 < Aliquat 336, which was in accordance with increase of their topological polar surface area (TPSA) values. Enzymatic digestibility, assayed as improved glucose formation from microcrystalline cellulose compared to an untreated BWPL control, increased with 19-33% after extraction with the long-chain organic extractants. Xylene treatment also improved saccharification, whereas ethyl acetate treatment worsened saccharification. Aliquat 336 was most efficient in improving enzymatic digestibility, but it was toxic to yeast cells, and residual Aliquat 336 after the extraction caused fermentation problems. Fermentations using Cyanex-921-extracted BWPL resulted in the best ethanol yield, 0.34±0.02 g/g on initial fermentable sugars. Extraction with xylene also resulted in relatively high ethanol yield, 0.29±0.02 g/g, while cultures with media consisting of untreated BWPL or BWPL treated with the other extractants exhibited no ethanol formation. Conclusions: We investigated for the first time the effects of conditioning with long-chain organic extractants on both enzymatic saccharification and microbial fermentation with yeast. The extractants efficiently promoted enzymatic saccharification in the presence of pretreatment liquid, with potential to recover inhibitory substances, such as aliphatic acids. The effects on the fermentability could be positive or negative, depending on if the extractant itself is toxic to the fermenting microorganism." @default.
- W4287509868 created "2022-07-25" @default.
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- W4287509868 date "2022-07-25" @default.
- W4287509868 modified "2023-09-26" @default.
- W4287509868 title "Conditioning of pretreated birch by liquid–liquid organic extractions to improve yeast fermentability and enzymatic digestibility" @default.
- W4287509868 doi "https://doi.org/10.21203/rs.3.rs-1865798/v1" @default.
- W4287509868 hasPublicationYear "2022" @default.
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