Department of Food Science and Human Nutrition, Center for Crops Utilization Research, 2312 Food Science Building, Iowa State University, Ames, IA 50011, USA.
Bioresour Technol. 2011 Oct;102(19):9199-205. doi: 10.1016/j.biortech.2011.06.071. Epub 2011 Jun 29.
The feasibility of using soy skim, a co-product of the aqueous processing of soybeans, in ethanol production from corn was evaluated. Specific growth rates were compared when Saccharomyces cerevisiae was grown in soy skim and peptone-yeast extract media supplemented with glucose. Such soy skim was proved to be a good nitrogen source for yeast growth. Next, fermentation of dry-ground corn to ethanol using soy skim as the media was simulated on 1.5-L scale. Replacing water with soy skim increased the initial ethanol production rates by 4-32% while final ethanol yield was about 39 g/100 g dry corn, similar to the result when water was used. Solid and protein contents in the finished beer increased with the addition of soy skim. Thus, replacing water in corn-ethanol fermentation with soy skim is feasible, and may improve the economics of both aqueous soybean processing and corn ethanol fermentation.
评估了利用大豆脱脂粉（大豆水加工的副产物）生产乙醇的可行性，大豆脱脂粉可以代替葡萄糖补充的蛋白胨酵母提取物来培养酿酒酵母。实验结果表明，大豆脱脂粉可以为酵母的生长提供良好的氮源。接下来，以大豆脱脂粉为发酵培养基，在 1.5L 规模上对干磨玉米进行发酵生产乙醇。用大豆脱脂粉代替水可以使初始乙醇生成速率提高 4%到 32%，而最终乙醇产率约为 39g/100g 干玉米，与使用水的结果相近。随着大豆脱脂粉的添加，成品啤酒的固形物和蛋白质含量增加。因此，用大豆脱脂粉代替玉米乙醇发酵中的水是可行的，这可能会提高水法大豆加工和玉米乙醇发酵的经济性。
