Abstract
Low-world oil prices but supportive government policies provide growing environmental and energy security support favorable for the bioethanol market. The need to generate large and sustainable supply of biomass to make bioethanol will require the development of crops grown specifically for bioenergy production. Given the existing history of genetic improvement and infrastructure available for sorghum, (Sorghum bicolor L. Moench) hybrids will be one of the several species dedicated as energy crop and the subject of this study. Texas A & M University Sorghum Breeding Program has developed hybrid sorghum varieties with high protein digestibility and improved starch digestibility. Most of the previous research on grain sorghum focused on the digestibility of sorghum protein from the nutritional point of view. The aim of the current study was to select best sorghum lines from relatively large and diverse sorghum samples that breeders are currently working with for the development of new low energy input liquefaction, saccharification and fermentation methodologies to produce bioethanol. Limited researches studies report on the performance of sorghum varieties in ethanol fermentation in relation to the protein and starch digestibility of sorghum.
Highlights
IntroductionThe worldwide production and consumption of ethanol as an alternative transportation fuel are dramatically increasing in response to growing environmental
Fermentation efficiency generally decreases as substrate concentration increases [22]
RVA results show that highly digestible protein (HD) lines have lower pasting temperature and faster rate of gelatinization compared to normal digestible (ND) lines
Summary
The worldwide production and consumption of ethanol as an alternative transportation fuel are dramatically increasing in response to growing environmental. C. Capareda concerns and strengthening economic security. In the United States, bioethanol reduces automotive emissions and as oxygenate substitute for methyl-butyl ether (MTBE). Concerns regarding groundwater contamination prohibit the use of MTBE in gasoline [1]. Since conventional cars produced from the late 1970’s can run on gasoline with ethanol amounts of up to 10 percent by volume (E10), ethanol industry has grown at a phenomenal rate. Over 20 million barrels of oil, accounting for two-thirds of the U.S daily oil consumption, are required just to fuel over 272 million vehicles in America. The U.S annual production capacity drastically rose from about 2 billion gallons per year in 2000 to nearly 7 billion gallon per year in 2007, with an additional 6 billion gallon per year capacity expected to come in line by the end of 2008 [2]
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