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Ethanol production from cassava and sago starch usingZymomonas mobilis

✍ Scribed by S. K. Rhee; G. M. Lee; Y. T. Han; Zainal Abidin Mohd. Yusof; M. H. Han; K. J. Lee

Publisher
Springer Netherlands
Year
1984
Tongue
English
Weight
305 KB
Volume
6
Category
Article
ISSN
0141-5492

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✦ Synopsis

Cassava and sago starch were evaluated for their feasibilities as substrates for ethanol production using Zymomonas mobilis ZM4 strain. Before fermentation, the starch materials were pretreated employing two commercial enzymes, Termamyl (thermostable a-amylase)and AMG(amyloglucosidase).

Using 2 ~i/g of Termamyl and 4 ~I/g of AMG, effective conversion of both cassava and sago starch into glucose was found with substrate concentration up to 30%(w/v) dry substances.

Fermentation study performed using these starch hydrolysates as substrates resulted in ethanol yield at an average of 0.48g/g by Z. mobilis ZM4.

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The conversion of starch from unhydrolyzed cassava flour to ethanol by a pure culture of Endomycopsis fibdigera and by a co-culture of this amylolytic yeast and the bacterium Zymmonas mobilis was studied. The best overall results were obtained using the mixed culture. After 96 h of fermentation of