Click on “Download PDF” for the PDF version or on the title for the HTML version.
If you are not an ASABE member or if your employer has not arranged for access to the full-text, Click here for options.
Simultaneous Saccharification and Fermentation of Highly Digestible Variety of Grain Sorghum for Ethanol Production
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: 2007 ASAE Annual Meeting 076037.(doi:10.13031/2013.23303)
Authors: Joan Rollog Hernandez, Froilan Lunada Aquino, Sergio Canzana Capareda, William L Rooney
Keywords: Ethanol production, enzymatic hydrolysis, highly digestible grain sorghum, Saccharomyces cerevisiea, simultaneous saccharification and fermentation
The simultaneous saccharification and fermentation of corn and different varieties of grain sorghum (i.e. high digestible and low digestible) were carried out using commercially available alpha amylase and glucoamylase enzymes and Saccharomyces cerevisiea yeast. The hydrolysis and fermentation conditions, such as enzyme, yeast and substrate concentrations, pH and temperature in all the runs were similar so that the ethanol yield will just be dependent on the starch digestibility. Among the three substrates, the highest ethanol concentration was obtained from the highly digestible sorghum. The study revealed that the high yielding sorghum cultivars with modified endosperm matrices can be used as an alternative for corn and can be optimized as a substrate for low energy input ethanol production. Since the food consumption demand for sorghum is lower compared to corn, the new variety of highly digestible grain sorghum has a great potential for ethanol fermentation, especially in semi-arid region. Savings in energy and time in this process could be accomplished via saccharification at lower temperature (32oC) concurrent with the fermentation process. The fermentation system needs to be optimized to ensure that there is no shortage of reducing sugars during the entire fermentation process.(Download PDF) (Export to EndNotes)