Factors impacting ethanol production from grain sorghum in the dry-grind process.

ABSTRACT The goal of this research is to understand the key factors affecting ethanol production from grain sorghum. Seventy genotypes and elite hybrids with a range of chemical compositions and physical properties selected from ≈1,200 sorghum lines were evaluated for ethanol production and were used to study the relationships of composition, grain structure, and physical features that affect ethanol yield and fermentation efficiency. Variations of 22% in ethanol yield and 9% in fermentation efficiency were observed among the 70 sorghum samples. Genotypes with high and low conversion efficiencies were associated with attributes that may be manipulated to improve fermentation efficiency. Major characteristics of the elite sorghum genotypes for ethanol production by the dry-grind method include high starch content, rapid liquefaction, low viscosity during liquefaction, high fermentation speed, and high fermentation efficiency. Major factors adversely affecting the bioconversion process are tannin content, l...

[1]  X. Sun,et al.  Ethanol and lactic acid production as affected by sorghum genotype and location , 2003 .

[2]  A. Pell,et al.  Analysis of condensed tannins: a review , 2001 .

[3]  L. Rooney,et al.  Starch properties as affected by sorghum grain chemistry , 2001 .

[4]  L. Butler,et al.  A critical evaluation of the vanillin reaction as an assay for tannin in sorghum grain , 1978 .

[5]  B. Hamaker,et al.  Discovery of grain sorghum germ plasm with high uncooked and cooked in vitro protein digestibilities , 1998 .

[6]  C. Parsons,et al.  Nutritional value of a highly digestible sorghum cultivar for meat-type chickens. , 2002, Journal of Agricultural and Food Chemistry.

[7]  P. Seib,et al.  Low-input wet-milling of grain sorghum for readily accessible starch and animal feed , 1995 .

[8]  P. Seib,et al.  Laboratory Wet‐Milling of Grain Sorghum With Abbreviated Steeping to Give Two Products , 2002 .

[9]  Bruce R. Hamaker,et al.  OVERVIEW: SORGHUM PROTEINS AND FOOD QUALITY , 2003 .

[10]  Donghai Wang,et al.  Ethanol production from pearl millet using Saccharomyces cerevisiae , 2006 .

[11]  Y. Pomeranz,et al.  Enzyme-resistant starch. II, Differential scanning calorimetry studies on heat-treated starches and enzyme-resistant starch residues , 1990 .

[12]  D. K. Salunkhe,et al.  Interactions of Tannic Acid and Catechin with Legume Starches , 1982 .

[13]  L. Lee,et al.  Relationship Between Rheological Properties and Microstructural Characteristics of Nondeveloped, Partially Developed, and Developed Doughs , 2001 .

[14]  Trust Beta,et al.  Genetic and environmental variation in sorghum starch properties , 2001 .

[15]  L. Rooney,et al.  Factors affecting starch digestibility with special emphasis on sorghum and corn. , 1986, Journal of animal science.

[16]  Charlotte K. Williams,et al.  The Path Forward for Biofuels and Biomaterials , 2006, Science.

[17]  C. Parsons,et al.  Condensed Tannins Are Only Partially Responsible for Variations in Nutrient Digestibilities of Sorghum Grain Cultivars , 1996 .

[18]  B. Hamaker,et al.  A highly digestible sorghum mutant cultivar exhibits a unique folded structure of endosperm protein bodies. , 2000, Proceedings of the National Academy of Sciences of the United States of America.

[19]  Donghai Wang,et al.  Effects of amylose, corn protein, and corn fiber contents on production of ethanol from starch-rich media. , 2006 .

[20]  W. R. Morrison.  Starch lipids and how they relate to starch granule structure and functionality , 1995 .

[21]  Paul A. Seib,et al.  Wet milling of grain sorghum using a short steeping period , 1996 .

[22]  S. Serna-Saldívar,et al.  Effect of fiber degrading enzymes on wet milling and starch properties of different types of sorghums and maize , 1999 .

[23]  W. M. Ingledew,et al.  Improved ethanol yields through supplementation with excess assimilable nitrogen , 1991, Journal of Industrial Microbiology.

[24]  Kerry C. Huber,et al.  Channels of maize and sorghum starch granules , 2000 .

[25]  K. Duodu,et al.  Effects of endosperm texture and cooking conditions on the in vitro starch digestibility of sorghum and maize flours , 2005 .

[26]  J. D. Wilson,et al.  Rapid Isolation of Sorghum and Other Cereal Starches Using Sonication , 2006 .

[27]  E. Mertz,et al.  Pepsin digestibility of proteins in sorghum and other major cereals. , 1984, Proceedings of the National Academy of Sciences of the United States of America.

[28]  K. G. Duodua,et al.  Factors affecting sorghum protein digestibility , 2003 .

[29]  S. Serna-Saldívar,et al.  Effect of Protease Addition on Starch Recovery from Steeped Sorghum and Maize , 2004 .

[30]  J. Oltjen,et al.  Effect of variety of sorghum grain on digestion and availability of dry matter and starch in vitro , 1990 .

[31]  B. Hamaker,et al.  Improving the in vitro protein digestibility of sorghum with reducing agents. , 1987, Proceedings of the National Academy of Sciences of the United States of America.

[32]  B. Hamaker,et al.  Low α-amylase starch digestibility of cooked sorghum flours and the effect of protein , 1998 .

[33]  Andrew D. Jones,et al.  Supporting Online Material for: Ethanol Can Contribute To Energy and Environmental Goals , 2006 .

[34]  Donald B. Thompson,et al.  Initial Heating Temperature and Native Lipid Affects Ordering of Amylose During Cooling of High-Amylose Starches , 1999 .

[35]  Xiuzhi Susan Sun,et al.  Ethanol production from supercritical-fluid-extrusion cooked sorghum , 2006 .

[36]  Donghai Wang,et al.  Effect of Decortication of Sorghum on Ethanol Production and Composition of DDGS , 2005 .