Constancy of glucose and starch fermentations by two different human faecal microbial communities.
Constancy of glucose and starch fermentations by two different human faecal microbial communities.
复制标题
两种不同的人类粪便微生物群落的葡萄糖和淀粉发酵的稳定性。
作者：
Weaver,GA;Krause,JA;Miller,TL;Wolin,MJ
在三年半的时间里，研究了两个受试者的粪便悬浮液发酵葡萄糖和玉米淀粉的情况。在此期间，每个受试者的底物专一性和粪便发酵产物相对稳定，且受试者之间存在显著差异。葡萄糖或淀粉发酵的主要可溶性终产物是醋酸酯、丙酸和丁酸盐。氢暂时积累，随后被两个受试者用于发酵。在受试者1的发酵中使用氢气，但在受试者2的发酵中使用氢气来生成甲烷。虽然两个受试者的葡萄糖发酵速度相似，但受试者1产生的丙酸摩尔比显著高于受试者2。受试者1的粪便悬浮液发酵淀粉的速度比受试者2快。受试者2的淀粉发酵中丁酸的摩尔比较大，而受试者1的丙酸的摩尔比较大。受试者之间在摩尔比、醋酸盐和丙酸的浓度以及粪便中丁酸的浓度方面存在显著差异。
The fermentation of glucose and corn starch by faecal suspensions from two subjects was examined over a three and a half year period. The substrate specificity and products of the faecal fermentations of each subject were relatively stable during this period and were significantly different between subjects. The major soluble end products of fermentation of glucose or starch were acetate, propionate, and butyrate. Hydrogen temporarily accumulated and was subsequently used in fermentations by both subjects. Hydrogen was used without methane production in fermentations of subject 1, but was used for methane formation in fermentations of subject 2. Although the rates of glucose fermentation were similar between both subjects; subject 1 produced a significantly greater molar ratio of propionate than did subject 2. The rate of fermentation of starch by faecal suspensions from subject 1 was faster than that of subject 2. The molar ratio of butyrate was greater for starch fermentations by subject 2, while the molar ratio of propionate was greater with subject 1. Significant differences were found between subjects in molar ratios and concentration of acetate and propionate and concentrations of butyrate in faeces.