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Direct fermentation of cassava starch to ethanol by mixed cultures of Endomycopsis fibuligera and Zymomonas mobilis: synergism and limitations.

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Title Direct fermentation of cassava starch to ethanol by mixed cultures of Endomycopsis fibuligera and Zymomonas mobilis: synergism and limitations.
 
Creator Reddy, O. V. S.
Basappa, S. C.
 
Subject 04 Fermentation Technology
01 Cassava-Tapioca
 
Description Simultaneous saccharification and fermentation of cassava starch to ethanol was studied. A mixed culture of Endomycopsis fibuligera NRRL 76 and Zymomonas mobilis ZM4 could ferment cassava starch (22.5% w/v) to ethanol (10.5% v/v); the fermentation was more efficient than in the respective monocultures. The combination of culture filtrate of E. fibuligera (containing amylases) and Z. mobilis simultaneously saccharified and fermented the cassava starch to ethanol equally well. Glucoamylase (0.01%) added to the fermentation medium improved ethanol production (13.2% v/v) by the above mixed culture to almost the theoretical level (98%), indicating that this enzyme is a rate-limiting factor in E. fibuligera. Z. mobilis alone also converted enzyme-hydrolysed starch to ethanol at almost theoretical levels (98%). [From En summ.]
 
Date 1996
 
Type Article
PeerReviewed
 
Format pdf
 
Language en
 
Identifier http://ir.cftri.com/7835/1/BIOTECHNOLOGY%20LETTERS%201996%2018%2811%29.pdf
Reddy, O. V. S. and Basappa, S. C. (1996) Direct fermentation of cassava starch to ethanol by mixed cultures of Endomycopsis fibuligera and Zymomonas mobilis: synergism and limitations. Biotechnology Letters, 18 (11). 1315-1318, 8 ref..