Fleming S E, Fitch M D, Chansler M W
Department of Nutritional Sciences, University of California, Berkeley 94720.
Am J Clin Nutr. 1989 Jul;50(1):93-9. doi: 10.1093/ajcn/50.1.93.
The effects of two sources of dietary fiber on the characteristics of cecal contents were assessed directly with miniature swine cannulated to facilitate frequent collections of cecal digesta. The short-chain fatty acid (SCFA) concentrations increased and the pH decreased at the same time that meal constituents entered the cecum; PEG was used as a dietary marker. The bean diet resulted in higher concentrations of acetate and total SCFA in cecal digesta, lower concentrations of butyrate, a larger SCFA pool size, and a more acidic pH than did the bran diet. Thus, we conclude that SCFA concentrations and acidity of the digesta are directly related and that dietary fibers can affect simultaneously several variables that are implicated as factors influencing colonic health.
通过对微型猪进行插管以方便频繁收集盲肠消化物，直接评估了两种膳食纤维来源对盲肠内容物特性的影响。当膳食成分进入盲肠时，短链脂肪酸（SCFA）浓度升高而pH值降低；聚乙二醇被用作膳食标记物。与麸皮日粮相比，豆类日粮使盲肠消化物中乙酸盐和总SCFA浓度更高，丁酸盐浓度更低，SCFA池更大，pH值更酸。因此，我们得出结论，消化物中SCFA浓度和酸度直接相关，膳食纤维可同时影响几个被认为是影响结肠健康的因素的变量。
