Low amounts of dietary fibre increase in vitro production of short-chain fatty acids without changing human colonic microbiota structure.

Low amounts of dietary fibre increase in vitro production of short-chain fatty acids without changing human colonic microbiota structure.
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DOI:
10.1038/s41598-017-18877-8
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发表时间:
2018-01-11
期刊:
影响因子:
4.6
通讯作者:
Osawa R
Osawa R
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Sasaki D;Sasaki K;Ikuta N;Yasuda T;Fukuda I;Kondo A;Osawa R

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本研究以每人每天摄入6克益生元(占膳食摄入量的0.2%)的剂量,研究了各种益生元(难消化糊精、α - 环糊精和葡聚糖)对人体结肠微生物群的影响。我们使用了一种基于粪便接种物进行分批发酵的体外人体结肠微生物群模型。细菌16S rRNA基因序列分析表明,添加0.2%的益生元并没有改变结肠微生物群的多样性和组成。这一发现与一项临床研究的结果相符,该临床研究显示,在七天内摄入6克益生元后,人类粪便样本的微生物群组成没有变化。然而,与不添加益生元相比,在体外系统中添加益生元降低了pH值,并增加了乙酸和丙酸的产生。因此,即使在如此相对较低的量下,益生元似乎也能够激活结肠微生物群的代谢。
This study investigated the effect of various prebiotics (indigestible dextrin, α-cyclodextrin, and dextran) on human colonic microbiota at a dosage corresponding to a daily intake of 6 g of prebiotics per person (0.2% of dietary intake). We used an in vitro human colonic microbiota model based on batch fermentation starting from a faecal inoculum. Bacterial 16S rRNA gene sequence analysis showed that addition of 0.2% prebiotics did not change the diversity and composition of colonic microbiota. This finding coincided with results from a clinical study showing that the microbiota composition of human faecal samples remained unchanged following administration of 6 g of prebiotics over seven days. However, compared to absence of prebiotics, their addition reduced the pH and increased the generation of acetate and propionate in the in vitro system. Thus, even at such relatively low amounts, prebiotics appear capable of activating the metabolism of colonic microbiota.
寡营养和富营养分批发酵系统中肠道微生物群对相同益生元配方的不同反应
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