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Hydrothermal alkaline sulfite pretreatment in the delivery of fermentable sugars from sugarcane bagasse

Abstract

This work aims to demonstrate the importance of the hydrothermal alkaline sulfite pretreatment of the sugarcane bagasse in the delivery of fermentable sugars. The pretreatment conditions, namely sodium sulfite loads (5.0 - 10.0 wt.%), temperatures (140 - 160 ºC) and reaction times (30 - 60 min) were tested according to the full factorial experimental design. The employed pretreatment was characterized by a high lignin removal (43 - 77 wt.%) and partial extraction of xylans (up to 25.0 wt.%), mainly by cleavage of acetyl and arabinosyl groups. After 72 h of enzymatic hydrolysis with 10 FPU (filter paper unit) cellulase and 10 CBU (cellobiose unit) β-glucosidase per g of pretreated bagasse, the conversion of the carbohydrate-enriched substrates was in the range of 51 to 80 mol.% for cellulose and 45 to 71 mol.% for xylans. The best hydrothermal alkaline sulfite pretreatment conditions (10.0 wt.% sulfite load, 150 °C and 45 min) showed to be highly efficient for delivery of fermentable sugar yield with yield as high as of 40.41.9 g for 100 g native bagasse.

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Publication details

The article was received on 15 Dec 2017, accepted on 05 Feb 2018 and first published on 06 Feb 2018


Article type: Paper
DOI: 10.1039/C7NJ04975G
Citation: New J. Chem., 2018, Accepted Manuscript
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    Hydrothermal alkaline sulfite pretreatment in the delivery of fermentable sugars from sugarcane bagasse

    J. E. B. Tavares, R. M. Lukasik, T. C.B. Paiva and F. T. da Silva, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C7NJ04975G

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