Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/12890
Title: Scaffold design of microencapsulated bioreactor for ethanol production
Authors: WOONG YI HUI
Keywords: Microencapsulated bioreactor ethanol yeast alginate ethylcellulose
Issue Date: 6-Dec-2008
Source: WOONG YI HUI (2008-12-06). Scaffold design of microencapsulated bioreactor for ethanol production. ScholarBank@NUS Repository.
Abstract: Shortage of fossil fuel has brought about a strong interest in renewable energy sources such as the ethanol produced by Saccharomyces cerevisiae. Microencapsulated yeast cells offer several advantages over free yeast cells in fermentation. For example, the microencapsulated cells are protected from environmental stress and this could prolong their survival and sustain the production of ethanol. This study demonstrates that the up scale production of discrete and spherical calcium alginate microspheres to microencapsulate the yeast cells could be achieved by the emulsification method. However, the alginate matrix may be disrupted by low pH and the carbon dioxide produced by the microencapsulated yeast during fermentation or due to the porous alginate matrix that enables breakthrough of the microencapsulated yeast. Therefore, the application of a coat around the yeast-loaded microspheres to serve as a scaffold was investigated in this study to overcome the breakthrough of yeast and at the same time allow mass transfer through the coat.
URI: http://scholarbank.nus.edu.sg/handle/10635/12890
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