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05.01.2023 | Original Article

Optimization of sequential alkali/acid pretreatment of corn cob for xylitol production by Debaryomyces nepalensis

verfasst von: Yogeswar Mohanasundaram, Vishnu Damodaran Nambissan, Sathyanarayana N. Gummadi

Erschienen in: Biomass Conversion and Biorefinery

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Abstract

A two-step sequential dilute alkali/acid pretreatment process was developed to improve the breakdown of the lignocellulosic structure of corn cob. Uniform design was used to optimize the hydrolysis process and multiple regression models were developed. Alkali hydrolysis of corn cob at optimum conditions of 1.81% (w/v) NaOH concentration and 5 (w/v) solid:liquid ratio for 90 min resulted in 82.03% lignin removal. The biomass on further dilute acid pretreatment at the optimized conditions of 6% (w/v) H2SO4 and 5 w/v solid:liquid ratio for 15 min resulted in 74% xylose yield. The xylose-rich acid hydrolysate was used as a substrate to produce xylitol by Debaryomyces nepalensis NCYC 3413. It resulted in a xylitol yield of 0.467 g/g of xylose and a xylitol titer of 21.15 g/L. The changes in the physical and chemical structure of the corn cob due to the sequential alkali/acid pretreatment were analyzed by SEM, XRD, FTIR, and TGA.

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Metadaten
Titel
Optimization of sequential alkali/acid pretreatment of corn cob for xylitol production by Debaryomyces nepalensis
verfasst von
Yogeswar Mohanasundaram
Vishnu Damodaran Nambissan
Sathyanarayana N. Gummadi
Publikationsdatum
05.01.2023
Verlag
Springer Berlin Heidelberg
Erschienen in
Biomass Conversion and Biorefinery
Print ISSN: 2190-6815
Elektronische ISSN: 2190-6823
DOI
https://doi.org/10.1007/s13399-022-03660-1