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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Comparative Evaluation of Acid and Alkaline Sulfite Pretreatments for Enzymatic Saccharification of Bagasses from Three Different Sugarcane Hybrids

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Author(s):
Monte, Joseana R. [1] ; Laurito-Friend, Debora F. [1] ; Mussatto, I, Solange ; Ferraz, Andre [1] ; Milagres, Adriane M. F. [1]
Total Authors: 5
Affiliation:
[1] Univ Sao Paulo, Escola Engn Lorena, Dept Biotecnol, BR-12602810 Lorena, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: BIOTECHNOLOGY PROGRESS; v. 34, n. 4, p. 944-951, JUL-AUG 2018.
Web of Science Citations: 1
Abstract

Sugarcane bagasses from three experimental sugarcane hybrids and a mill-reference sample were used to compare the efficiency and mode of action of acid and alkaline sulfite pretreatment processes. Varied chemical loads and reaction temperatures were used to prepare samples with distinguished characteristics regarding xylan and lignin removals, as well as sulfonation levels of residual lignins. The pretreatment with low sulfite loads (5%) under acidic conditions (pH 2) provided maximum glucose yield of 70% during enzymatic hydrolysis with cellulases (10 FPU/g) and beta-glucosidases (20 UI/g bagasse). In this case, glucan enzymatic conversion from pretreated materials was mostly associated with extensive xylan removal (70-100%) and partial delignification occurred during the pretreatment. The use of low sulfite loads under acidic conditions required pretreatment temperatures of 160 degrees C. In contrast, at a lower pretreatment temperature (120 degrees C), alkaline sulfite process achieved similar glucan digestibility, but required a higher sulfite load (7.5%). Residual xylans from acid pretreated materials were almost completely hydrolysed by commercial enzymes, contrasting with relatively lower xylan to xylose conversions observed in alkaline pretreated samples. Efficient xylan removal during acid sulfite pretreatment and during enzymatic digestion can be useful to enhance glucan accessibility and digestibility by cellulases. Alkaline sulfite process also provided substrates with high glucan digestibility, mainly associated with delignification and sulfonation of residual lignins. The results demonstrate that temperature, pH, and sulfite can be combined for reducing lignocellulose recalcitrance and achieve similar glucan conversion rates in the alkaline and acid sulfite pretreated bagasses. (C) 2018 American Institute of Chemical Engineers (AU)

FAPESP's process: 14/06923-6 - Sugar cane biomass recalcitrance: basic knowledge related to the cell wall construction, pretreatment and enzymatic digestion, applied for the development of innovative biorefinery models
Grantee:Andre Luis Ferraz
Support Opportunities: Program for Research on Bioenergy (BIOEN) - Thematic Grants