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Conversion of starch from dry common beans (Phaseolus vulgaris L.) to ethanol |
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| Authors: | Nancy N Nichols Nongnuch SutivisedsakBruce S Dien Atanu BiswasWilliam C Lesch Michael A Cotta |
| Institution: | a Bioenergy Research Unit, National Center for Agricultural Utilization Research, Agricultural Research Service, U.S. Department of Agriculture, 1815N. University St., Peoria, IL 61604, USA b Plant Polymer Research Unit, National Center for Agricultural Utilization Research, Agricultural Research Service, U.S. Department of Agriculture, Peoria, IL, USA c Department of Marketing, University of North Dakota, Grand Forks, ND, USA |
| Abstract: | Dry common beans (Phaseolus vulgaris L.) were evaluated for potential conversion of starch to ethanol. Eight varieties of beans with average starch content of 46% (db) were assayed in a laboratory-scaled process based upon the commercial corn dry grind fermentation process. Ethanol yield was 0.43-0.51 g ethanol/g glucose (0.19-0.23 g ethanol/g beans). The average ethanol yield for the eight bean types was 92% of maximum theoretical yield, demonstrating that starch from beans could be efficiently converted to ethanol. Ethanol concentration obtained from 20% (w/w) solids loading was 3.5-4.4% (w/v). The residual fermentation solids contained, on a dry basis, 37.1-43.6% crude protein, 10.8-15.1% acid detergent fiber and 19.1-31.3% neutral detergent fiber. |
| Keywords: | Ethanol Starch Phaseolus Common beans Dry beans Phytochemicals |
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