Objectives of this study were to compare ethanol production between normal and waxycorn using a cold-fermentation process and to understand effects of starch structures and properties on the ethanol production. Ethanol yields positively correlated (p<0.01) with starch contents of kernels of the normal and waxycorn. The average starch-ethanol conversion efficiency of the waxycorn (93.0%) was substantially greater than that of the normalcorn (88.2%). waxycornstarch consisted of very little amylose and mostly amylopectin that had a shorter average branch-chain-length than the normalcorn amylopectin. Regression analyses showed that average amylopectin branch-chain-lengths and the percentage of long branch-chains (DP>37) of waxycornstarch negatively correlated with the starch-hydrolysis rate and the ethanol yield. These results indicated that starch structures and properties of the normal and waxycorn had significant effects on the ethanol yield using a cold-fermentation process.
(Yangcheng et al. 2012)
Yangcheng H, Jiang H, et al. (2012). Characterization of normal and waxy corn starch for bioethanol production. J. Agric. Food Chem. 61 (2): 379-86.