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Indexed by:期刊论文

Date of Publication:2014-06-01

Journal:PLASMA SCIENCE & TECHNOLOGY

Included Journals:SCIE、EI

Volume:16

Issue:6

Page Number:602-607

ISSN No.:1009-0630

Key Words:dielectric barrier discharge air plasma; Candida shehatae; ethanol fermentation; xylose; xylose reductase; xylitol dehydrogenase

Abstract:Xylose fermentation is essential for ethanol production from lignocellulosic biomass. Exposure of the xylose-fermenting yeast Candida shehatae (C. shehatae) CICC1766 to atmospheric pressure dielectric barrier discharge (DBD) air plasma yields a clone (designated as C81015) with stability, which exhibits a higher ethanol fermentation rate from xylose, giving a maximal enhancement in ethanol production of 36.2% compared to the control (untreated). However, the biomass production of C81015 is lower than that of the control. Analysis of the NADH (nicotinamide adenine dinucleotide)- and NADPH (nicotinamide adenine dinucleotide phosphate)linked xylose reductases and NAD(+)-linked xylitol dehydrogenase indicates that their activities are enhanced by 34.1%, 61.5% and 66.3%, respectively, suggesting that the activities of these three enzymes are responsible for improving ethanol fermentation in C81015 with xylose as a substrate. The results of this study show that DBD air plasma could serve as a novel and effective means of generating microbial strains that can better use xylose for ethanol fermentation.