An integrated process for xylooligosaccharide and bioethanol production from corncob

Bioresource Technology
Pinpanit BoonchuayThanongsak Chaiyaso

Abstract

An integrated process for xylooligosaccharides (XOs) and bioethanol production from corncob was investigated. XOs were produced by a consecutive process of KOH treatment and hydrolysis by an in-house thermostable endo-xylanase from Streptomyces thermovulgaris. XO yields of 0.15 g/gKOH-treated corncob (22.13 g/L) and 0.52 g/graw corncob of cellulose-rich corncob (CRC) were obtained. After 96 h of enzymatic hydrolysis, CRC hydrolysate contained 62.16, 51.21, 10.03 and 0.92 g/L of total sugar, glucose, xylose and arabinose, respectively. Bioethanol production by separate hydrolysis and fermentation (SHF) using CRC hydrolysate, and by simultaneous saccharification and fermentation (SSF) using CRC was studied at 40 °C for thermotolerant Candida glabrata. SHF showed an ethanol yield of 0.28 g/gCRC (21.92 g/L) and ethanol productivity of 0.304 g/L/h with 93% theoretical yield. Surprisingly, by SSF, those parameters were 0.27 g/gCRC (31.32 g/L), 0.33 g/L/h and 89%, respectively. This integrated process might be a new cost-effective approach for corncob valorization.

Citations

Apr 2, 2019·Preparative Biochemistry & Biotechnology·Thanongsak ChaiyasoMasanori Watanabe
Sep 20, 2020·Bioprocess and Biosystems Engineering·Maria Angélica F PereiraPatrícia Poletto
Sep 29, 2019·Journal of Bioscience and Bioengineering·Hengwei WangAnli Geng
Feb 5, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Katja VasićMaja Leitgeb
May 1, 2021·International Journal of Environmental Research and Public Health·Kang Hyun LeeHah Young Yoo
Jul 20, 2021·Journal of Environmental Management·Muhammad Kashif ShahidYounggyun Choi
Jul 6, 2020·Journal of Biotechnology·Wilian F MarcondesValdeir Arantes

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