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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/26382

    Title: Effects of light wavelength and intensity on the production of ethanol by Saccharomyces cerevisiae in batch cultures
    Authors: Shu,CH;Huang,CK;Tsai,CC
    Contributors: 化學工程與材料工程學系
    Date: 2009
    Issue Date: 2010-06-29 17:26:48 (UTC+8)
    Publisher: 中央大學
    Abstract: BACKGROUND: Photoreceptors have been identified in Saccharomyces cerevisae, however, the influence of light on the performance of ethanol fermentation of S. cerevisiae is not yet clear. The aims of this study are to elucidate the influence of light wavelength and intensity on the growth and ethanol production of S. cerevisiae and to describe a novel two-stage LED light process to optimize ethanol fermentation. RESULTS: Experimental results indicated that maximum biomass concentration X-max of the batch under red LED light increased monotonically with light intensity, and the optimal specific product yield Y-p/x was 13.2 g g(-1) at 600 lux. Maximum ethanol concentration P-max. of the batch under blue LED light increased monotonically with light intensity, and the optimal Y-p/x was 18.4 g g(-1) at 900 lux. A novel two-stage LED light process achieved maximum P-max, of 98.7 g dm(-3) resulting in 36% improvement compared with that of the batch in the dark. CONCLUSION: The light wavelength and its intensity significantly affected cell growth and ethanol formation of S. cerevisiae. Red LED light (630 nm) stimulated cell growth but slightly inhibited ethanol formation. In contrast, blue LED light (470 nm) significantly inhibited cell growth but stimulated ethanol formation. A novel two-stage LED light process has been successfully demonstrated to optimize ethanol fermentation of S. cerevisiae. (C) 2009 Society of Chemical Industry
    Appears in Collections:[化學工程與材料工程研究所] 期刊論文

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