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Accelerated Bioethanol Fermentation By Using A Novel Yeast Immobilization Technique: Microtube Array Membrane

C. Chen, C. H. Wu, J. J. Wu, Chien Chih Chiu, Chien Hsuan Wong, Min Lang Tsai, Hong Ting Lin
Published 2015 · Chemistry

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Abstract Cell immobilization is a way to isolate or localize intact cells in a certain space and maintain their catalytic activity. Immobilized cells can effectively reduce the negative effects of inhibitors and the processing cost of inoculum preparation for continuous or fed-batch fermentation of microorganisms. In this study, a novel yeast immobilization technique using renewable poly- l -lactic acid (PLLA) microtube array membrane (MTAM) was thoroughly evaluated for bioethanol fermentation. PLLA-MTAM was shown to be stable in 15% (v/v) ethanol solution during shaking cultivation. A yeast encapsulation efficiency of 67–70% was obtained, and the yeasts in MTAMs with greater porosity showed greater bioethanol productivity. The MTAM-immobilized Kluyveromyces marxianus , prepared using in situ and siphon methods, were evaluated using 5% (w/v) glucose fermentation. Improved glucose consumption and bioethanol production were observed in batch bioethanol fermentation. In 7 cycles during repeated-batch fermentation, the immobilized yeasts prepared using the in situ method showed a maximum C EtOH of 24.23 g/L, maximum Y P/S of 0.48 g/g, and r P EtOH of 2.69 g/L h. Our data indicated that the PLLA-MTAM immobilized yeasts significantly enhanced bioethanol productivity and was a novel, promising technology for bioethanol fermentation.
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