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Sorghum as a renewable feedstock for production of fuels and industrial chemicals

Eastern Regional Research Center, Agricultural Research Service, U.S. Department of Agriculture, Wyndmoor, Pennsylvania, 19038 USA

Considerable efforts have been made in the USA and other countries to develop renewable feedstocks for production of fuels and chemicals. Among these, sorghum has attracted strong interest because of its many good characteristics such as rapid growth and high sugar accumulation, high biomass production potential, excellent nitrogen usage efficiency, wide adaptability, drought resistance, and water lodging tolerance and salinity resistance. The ability to withstand severe drought conditions and its high water usage efficiency make sorghum a good renewable feedstock suitable for cultivation in arid regions, such as the southern US and many areas in Africa and Asia. Sorghum varieties include grain sorghum, sweet sorghum, and biomass sorghum. Grain sorghum, having starch content equivalent to corn, has been considered as a feedstock for ethanol production. Its tannin content, however, may cause problems during enzyme hydrolysis. Sweet sorghum juice contains sucrose, glucose and fructose, which are readily fermentable by Saccharomyces cerevisiae and hence is a good substrate for ethanol fermentation. The enzyme invertase, however, needs to be added to convert sucrose to glucose and fructose if the juice is used for production of industrial chemicals in fermentation processes that employ microorganisms incapable of metabolizing sucrose. Biomass sorghum requires pretreatment prior to enzymatic hydrolysis to generate fermentable sugars to be used in the subsequent fermentation process. This report reviews the current knowledge on bioconversion of sorghum to fuels and chemicals and identifies areas that deserve further studies.
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1. Dale E and Holtzapple M (2015) The needs for biofuels. Chem Eng Prog 111: 36–44.

2. 2014 World Fuel Ethanol Production, Renewable Fuels Association (RFA) (2014) Available from: http://ethanolrfa.org/pages/World-Fuel-Ethanol-Production.

3. Connor M, Liao J (2009) Microbial production of advanced transportation fuels in non-natural hosts. Curr Opin Biotechnol 20: 307–315.    

4. Kumar M, Gayen K (2011) Development in biobutanol production: New insights. Appl Energy 88: 1999–2012.    

5. Ni Y, Sun Z (2009) Recent progress in industrial fermentative production of acetone-butanol-ethanol by Clostridium acetobutylicum in China. Appl Microbiol Biotechnol 83: 415–423.    

6. Mattam A, Yazdani S (2013) Engineering E. coli strain for conversion of short chain fatty acids to bioalcohols. Biotechnol Biofuel 6: 128.

7. Werpy T, Petersen G (2004) Top Value Added Chemicals from Biomass, Volume 1 – Results of screening for potential candidates from sugars and synthesis gas. U. S. Department of Energy.

8. Nghiem N, Donnelly M, Millard C, et al. (1999) Method for the production of dicarboxylic acids, U. S. Patent 5,869,301.

9. Donnelly M, Sanville-Millard C, Nghiem N (2004) Method to produce succinic acid from raw hydrolysates. U. S. Patent 6,743,610.

10. Nghiem N, Davison B, Donnelly M, et al. (2001) An integrated process for the production of chemicals from biologically derived succinic acid. In: J.J. Bozell (Ed), Chemicals and Materials from Renewable Resources, ACS Symposium Series 784, Washington: American Chemical Society, 160–173.

11. De Guzman D (2014) More bio-succinic acid commercialization milestones. Green Chemicals Blog. Available from: http://greenchemicalsblog.com/2014/10/07/more-bio-succinic-acid-commercialization-milestones/.

12. Almodares A, Sepahi A (1996) Comparison among sweet sorghum cultivars, lines and hybrids for sugar production. Ann Plant Physiol 10: 50–55.

13. Almodares A, Sepahi A, Dalilitajary H, et al. (1994) Effect of phonological stages on biomass and carbohydrate contents of sweet sorghum cultivars. Ann Plant Physiol 8: 42–48.

14. Bean B, Bronson K, Schwartz R, et al. (2008) Nitrogen requirements of sorghums for biofuel feedstock production in the southern high plains. Proc Great Plains Soil Fertility Conf, Denver, CO, 15–18.

15. Reddy B, Ramesh S, Reddy P, et al. (2005) Sweet sorghum—A potential alternate raw material for bio-ethanol and bio-energy. Int Sorghum Millets Newslett 46: 79–86.

16. Tesso T, Claflin L, Tuinstra M (2005) Analysis of stalk rot resistance and genetic diversity among drought tolerant sorghum genotypes. Crop Sci 45: 645–652.    

17. Vasilakoglou I, Dhima K, Karagiannidis N, et al. (2011) Sweet sorghum productivity for biofuels under increased soil salinity and reduced irrigation. Field Crops Res 120: 38–46.

18. Shoemaker C, Bransby D (2010) The role of sorghum as a bioenergy feedstock. Proc Sustainable Feedstocks for Advance Biofuels Workshop, Atlanta, GA, 149–159.

19. Almodares A, Hadi M (2009) Production of bioethanol from sweet sorghum: A review. African J Ag Res 4: 772–780.

20. Ratnavathi C, Chakravarthy S, Komala V, et al. (2011) Sweet sorghum as feedstock for biofuel production: A review. Sugar Tech 13: 399–407.    

21. Serna-Saldivar S, Chuck-Hernandez C, Perez-Carrillo E, et al. (2012) Sorghum as a multifunctional crop for the production of fuel ethanol: Current status and future trends. In: M.A.P. Lima (Ed), Bioethanol, Rijeka, Croatia, 51–74.

22. Whitfield M, Chinn M, Veal M (2012) Processing of materials derived from sweet sorghum for biobased products. Ind Crops Products 37: 362–375.    

23. Eggleston G, Cole M, Andrzejewski B (2013) New commercially viable processing technologies for the production of sugar feedstocks from sweet sorghum (Sorghum bicolor L. Moench) for manufacture of biofuels and bioproducts. Sugar Tech 15: 232–249.

24. Wu X, Zhao R, Bean S, et al. (2007) Factors impacting ethanol production from grain sorghum in the dry-grind process. Cereal Chem 84: 130–136.    

25. 2014 Annual Report, United Sorghum Checkoff Program. (2015) Available from: http://sorghumcheckoff.com/wp-content/uploads/2015/02/2015_AnnualReportFinaSM.pdf.

26. 2015 Ethanol Industry Outlook, Renewable Fuels Association. (2015) Available from: http://ethanolrfa.3cdn.net/c5088b8e8e6b427bb3_cwm626ws2.pdf.

27. Wang D, Bean S, McLaren J, et al. (2008) Grain sorghum is a viable feedstock for ethanol production. J Ind Microbiol Biotechnol 35: 313–320.    

28. Zhao R, Bean S, Wang D, et al. (2009) Small-scale mashing procedure for predicting ethanol yield of sorghum grain. J Cereal Sci 49: 230–238.    

29. Butler L, Riedl D, Lebryk D, et al. (1984) Interaction of proteins with sorghum tannin: Mechanism, specificity and significance. J Am Oil Chem Soc 61: 916–920.    

30. Corredor D, Bean S, Schober T, et al. (2006) Effect of decorticating sorghum on ethanol production and composition of DDGS. Cereal Chem 83: 17–21.    

31. Awika J, McDonough C, Rooney L (2005) Decorticating sorghum to concentrate healthy phytochemicals.J Agric Food Chem53: 6230–6234.

32. Reichert R, Fleming S, Schwab D (1980) Tannin deactivation and nutritional improvement of sorghum by anaerobic storag