SO2-Catalyzed Steam Explosion of Corn Fiber for Ethanol Production
Corn fiber, a by-product of the corn wet-milling industry, represents a renewable resource that is readily available in significant quantities and could potentially serve as a low-cost feedstock for the production of fuel-grade alcohol. In this study, we used a batch reactor to steam explode corn fiber at various degrees of severity to evaluate the potential of using this feedstock in the bioconversion process. The results indicated that maximum sugar yields (soluble and following enzymatic hydrolysis) were recovered from corn fiber that was pretreated at 190°C for 5 min with 6% SO2. Sequential SO2-catalyzed steam explosion and enzymatic hydrolysis resulted in very high conversion (81%) of all polysaccharides in the corn fiber to monomeric sugars. Subsequently, Saccharomyces cerevisiae was able to convert the resultant corn fiber hydrolysates to ethanol very efficiently, yielding 90–96% of theoretical conversion during the fermentation process.
Index EntriesCorn fiber steam pretreatment enzymatic hydrolysis fermentation ethanol
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- 1.Grohmann, K., Torget, R., and Himmel, M. (1985), Biotechnol. Bioeng. Symp. 15, 59–80.Google Scholar
- 5.O’Connor, D. (2000), Liquid Fuels from Biomass: North American Impact on Non-technical Barriers on Implementation, Report IEA Bioenergy Task 27, Delta, Canada, pp. 34–46.Google Scholar
- 6.Anderson, R. A. and Watson, S. A. (1982), in Handbook of Processing and Utilization in Agriculture, vol. 2, Wolff, I. A. ed., CRC, Boca Raton, FL, pp. 31–61.Google Scholar
- 11.Schwald, W., Smaridge, T., Chan, M., Breuil, C., and Saddler, J. N. (1987), in Enzyme Systems for Lignocellulose Degradation, Coughlan, M.P. ed., Elsevier, NY, pp. 231–242.Google Scholar
- 23.Brownell, H. H., Schwald, W., Smaridge, T., and Saddler, J.N. (1988), in Proceedings of the IEA Workshop on Bioconversion of Lignocellulosics, Saddler, J. N., Stevens, D., and Hages, D., eds., Forintek Canada, Ottawa, Ontario, pp. A–1.Google Scholar
- 24.TAPPI, Technical Association of the Pulp and Paper Industry (1998), TAPPI Standard Methods, T-222 om-98, TAPPI Press, Atlanta, GA.Google Scholar
- 27.Whistler, R. L. (1993), in Industrial Gums: Polysaccharides and Their Derivatives, 3rd ed., Whistler, R. L. and BeMiller, J. N., eds., Academic, San Diego, CA, pp. 294–308.Google Scholar