期刊
BIORESOURCE TECHNOLOGY
卷 256, 期 -, 页码 399-407出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.02.004
关键词
Bioethanol; Cellulose-rich corncob; Integrated process; Thermotolerant yeast; Xylooligosaccharides
资金
- Chiang Mai University (CMU), Thailand
- Graduate School of CMU
- Faculty of Agro-Industry, CMU
- Functional Food Research Center for Well-being, CMU
- National Research Council of Thailand (NRCT) [2559A10432034]
- Japan Student Services Organization (JASSO) Student Exchange Support Program (Scholarship for Short-Term Study in Japan)
- Scientific Cooperation Program of the Japan Society for the Promotion of Science (JSPS)
- National Research Council of Thailand (NRCT)
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 endoxylanase from Streptomyces thermovulgaris. XO yields of 0.15 g/g(KOH-treated corncob) (22.13 g/L) and 0.52 g/g(raw) 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 degrees C for thermotolerant Candida glabrata. SHF showed an ethanol yield of 0.28 g/g(CRC) (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.
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