Animal Nutrition Group, Wageningen University , P.O. Box 338, 6700 AH Wageningen, The Netherlands.
J Agric Food Chem. 2013 Sep 18;61(37):8821-8. doi: 10.1021/jf4019855. Epub 2013 Sep 5.
Currently, the use of maize dried distillers grain with solubles (DDGS) as protein source in animal feed is limited by the inferior protein quality and high levels of non-starch polysaccharides (NSP). Processing technologies and enzymes that increase NSP degradability might improve digestive utilization of DDGS, enhancing its potential as a source of nutrients for animals. The effects of various combinations of processing technologies and commercial enzyme mixtures on in vitro digestion and subsequent fermentation of DDGS were tested. Wet-milling, extrusion, and mild hydrothermal acid treatment increased in vitro protein digestion but had no effect on NSP. Severe hydrothermal acid treatments, however, effectively solubilized NSP (48-78%). Addition of enzymes did not affect NSP solubilization in unprocessed or processed DDGS. Although the cell wall structure of DDGS seems to be resistant to most milder processing technologies, in vitro digestion of DDGS can be effectively increased by severe hydrothermal acid treatments.
目前，玉米干酒糟及其可溶物（DDGS）作为动物饲料中的蛋白质来源，其蛋白质质量较差且非淀粉多糖（NSP）含量较高，因而受到限制。提高 NSP 降解率的加工技术和酶可以改善 DDGS 的消化利用率，从而提高其作为动物营养来源的潜力。本研究测试了不同组合的加工技术和商业酶混合物对 DDGS 体外消化和随后发酵的影响。湿磨、挤压和温和的湿热酸处理增加了体外蛋白质消化，但对 NSP 没有影响。然而，剧烈的湿热酸处理可有效溶解 NSP（48-78%）。添加酶对未经处理或处理后的 DDGS 中的 NSP 溶解没有影响。尽管 DDGS 的细胞壁结构似乎对大多数较温和的加工技术具有抗性，但剧烈的湿热酸处理可以有效地增加 DDGS 的体外消化。
