Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: March 10, 2005
Publication Date: April 10, 2005
Citation: Robertson, G.H., Wong, D., Lee, C.C., Wagschal, K.C., Smith, M.R. 2005. Evolved enzymes for cold or non-cooking hydrolysis of starches to fermentation feedstock. In Proceedings of the North American Grain Congress, February 20-22, 2005, Reno, NV. 2005 CDROM. Technical Abstract: Raw starch digestion can reduce energy use in conventional fuel ethanol fermentation from grains by replacing the cooking liquefaction and saccharification steps with low temperature digestion of starch by enzymes. Evidence for its use in beverage fermentations dates to pre-Christian Egypt. The possibility has been considered for fuel ethanol since the 1940's but a number of factors have impeded adoption by industry. This poster will provide an overview to the prior research (bench to pilot), quanitify the energy savings possibilities, summarize the many raw-starch digestion enzymes identified since the 1980's, describe limitations and opportunities, and indicate significant recent progress in the development of process technology and biocatalytic resources that may make this alternative approach an energy saving reality and facilitate the utilization of grains in fuel ethanol processing systems.