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To explore the effect of  Portulaca oleracea  polysaccharides (POP) in regulating intestinal microflora in aged rats  in vitro , its intestinal microbial composition was analyzed by 16 S rDNA high-throughput sequencing, and the level of short-chain fatty acids in fermentation broth was determined by LC-MS. POP significantly upregulated the relative abundance of  Lactobacillus ,  Eggerthella , and  Paraprevotella  and significantly downregulated  Escherichia_Shigella ,  Bacteroides , and  Eubacterium nodatum  groups. The pH value and ammonia nitrogen level decreased significantly in the POP-treated group, resulting in a more short-chain fatty acid consumption which changed the acid–base environment of the fermentation broth. In conclusion, POP is beneficial to aged rats because it can regulate intestinal flora, promote the growth of probiotics, and inhibit the reproduction of pathogenic bacteria.

Portulaca oleracea Polysaccharides Modulate Intestinal Microflora in Aged Rats in vitro