Bacterial cellulose membrane – A new support carrier for yeast immobilization for ethanol fermentation |
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| Authors: | Wanying Yao Xiao Wu Jun Zhu Bo Sun Yan Y. Zhang Curtis Miller |
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| Affiliation: | aBioproducts and Biosystems Engineering Department, University of Minnesota, 1390 Eckles Avenue, St. Paul, MN 55108, USA;bDepartment of Chemical Engineering, Tsinghua University, China;cSouthern Research and Outreach Center, University of Minnesota, 35838 120th Street, Waseca, MN 56093, USA;dCollege of Food Science and Engineering, The Northeast Agricultural University, Harbin, China |
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| Abstract: | The aim of the work was to study the properties of the bacterial cellulose membrane (BCM) and the feasibility of using it as a new, environmentally friendly support carrier for yeast cell immobilization. It was observed that the morphology of BCM varied with different cultivation methods and the scanning electron microscopy (SEM) images confirmed that the yeast cells were entrapped in the porous network of BCM obtained from the static culture and stabilized by the cross-linked fibrils. Particularly, the research confirmed the effectiveness of yeast immobilization in BCM reflected by the high yield of alcohol (9.7% v/v, a 21.25% increase of those using free cells) and the high stability. The specific rate of ethanol production by the immobilized cells in BCM was 2.1 g g−1 h−1, 31.3% greater than that of the suspended cells. Results implied that applying BCM as the support carrier had little adverse effects on cell viability and proliferation. Instead, it facilitated the product leakage and nutrients transportation through the porous network. |
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| Keywords: | Bacterial cellulose Microstructure Biodegradability Yeast immobilization Ethanol fermentation |
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