Chiang Mai Journal of Science

Print ISSN: 0125-2526 | eISSN : 2465-3845

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Influences of Buffer Systems on Enzymatic Saccharification of Rice Husk Holocellulose and Fermenting Ability of Various Ethanol Producing Microorganisms

Woottichai Nachaiwieng [a], Apinun Kanpiengjai [a], Takashi Watanabe [b] and Chartchai Khanongnuch
* Author for corresponding; e-mail address: chartchai.k@cmu.ac.th
Volume: Vol.44 No.2 (April 2017)
Research Article
DOI:
Received: 3 May 2015, Revised: -, Accepted: 14 August 2015, Published: -

Citation: Nachaiwieng W., Kanpiengjai A., Watanabe T. and Khanongnuch C., Influences of Buffer Systems on Enzymatic Saccharification of Rice Husk Holocellulose and Fermenting Ability of Various Ethanol Producing Microorganisms, Chiang Mai Journal of Science, 2017; 44(2): 406-413.

Abstract

Four saccharification buffers, including acetate, citrate, phthalate and succinate buffers, were evaluated for their effects on both saccharification and fermentation of rice husk holocellulose. At a concentration of 30 mM, all buffer systems were found to be suitable for saccharification by three commercial cellulolytic enzymes (Meicelase, Accellerase 1500 and Accellerase XC). However, at concentrations of 50-200 mM, citrate and acetate buffers partially inhibited the fermenting ability of Saccharomyces cerevisiase, Zymomonas mobilis, Kluyveromyces marxianus, Candida shehatae and Pichia stipitis. This was in contrast to phthalate and succinate buffers in which these organisms retained 100% relative fermenting ability within concentrations in the range of 50-500 mM. This is the first report indicating potential buffers appropriate for broad ethanol producing microorganisms in bioethanol fermentation, particularly for co-culture fermentation of cellulosic hydrolysate.

Keywords: bioethanol, biomass conversion, buffer, fermentation, rice husk, saccharification

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