title: Efficacy of oral Bifidobacterium bifidum ATCC 29521 on microflora and antioxidant in mice.
abstract: This study aimed to examine whether Bifidobacterium bifidum ATCC 29521, a species of colonic microflora in humans, is involved in the intestinal tract of mice. This study was also conducted to determine the antioxidant activity of this species by evaluating different microbial populations and reactive oxygen species isolated from feces and intestinal contents for 28 days of oral administration. Microbial diversities were assessed through bacterial culture techniques, PCR-DGGE, and real-time PCR. This study showed that the intake of B. bifidum ATCC 29521 significantly (p < 0.05) improved the ecosystem of the intestinal tract of BALB/c mice by increasing the amount of probiotics (Lactobacillus intestinalis and Lactobacillus crispatus) and by reducing unwanted bacterial populations (Enterobacter, Escherichia coli). Antioxidative activities of incubated cell-free extracts were evaluated through various assays, including the scavenging ability of DPPH radical (64.5% and 67.54% (p < 0.05), respectively, at 21 days in nutrients and 28 days in MRS broth), superoxide anion, and hydroxyl radical (85% and 61.5% (p < 0.05), respectively, at intestinal contents in nutrients and 21 days in MRS broth). Total reducing power (231.5 μmol/L (p < 0.05), 14 days in MRS broth) and mRNA level of genes related to oxidative stress were also determined. Results indicated that B. bifidum ATCC 29521 elicits a beneficial effect on murine gut microbiota and antioxidant activities compared with the control samples. This species can be considered as a potential bioresource antioxidant to promote health. Bifidobacterium bifidum ATCC 29521 may also be used as a promising material in microbiological and food applications.
authors: a State Key Laboratory of Food Science and Engineering, Nanchang University, Nanchang, Jiangxi 330047, People's Republic of China.
authors: Bao-gui
authors: BG
authors: Wang
authors: b Tianjin Key Laboratory of Exercise Physiology and Sports Medicine, Department of Health and Exercise Science, Tianjin University of Sport, Tianjin 300381, People's Republic of China.
authors: Hai-bo
authors: HB
authors: Xu
authors: a State Key Laboratory of Food Science and Engineering, Nanchang University, Nanchang, Jiangxi 330047, People's Republic of China.
authors: Feng
authors: F
authors: Xu
authors: a State Key Laboratory of Food Science and Engineering, Nanchang University, Nanchang, Jiangxi 330047, People's Republic of China.
authors: Zhe-ling
authors: ZL
authors: Zeng
authors: a State Key Laboratory of Food Science and Engineering, Nanchang University, Nanchang, Jiangxi 330047, People's Republic of China.
authors: Hua
authors: H
authors: Wei
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000494:pharmacology*; D001644:Bifidobacterium; D000069196:Gastrointestinal Microbiome; D006801:Humans; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D009055:Mouth / Q000382:microbiology*; D018384:Oxidative Stress
chemical_list: D000975:Antioxidants
keywords: Bifidobacterium bifidum ATCC 29521; PCR en temps reel; PCR–DGGE; activité antioxydante; antioxidant activity; gastrointestinal microflora; microflore gastro-intestinale; real-time PCR