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Intestinal bacteria Bifidobacterium

The ability to hydrolyze the peptide bond in conjugated bile acids (Fig. 1) is widely distributed among intestinal bacteria. Conjugated bile acid hydrolase (CBH) (EC 3.5) activity has been detected in members of the genera Bacteroides, Bifidobacterium, Fusobacterium, Clostridium, Lactobacillus, Peptostreptococcus and Streptococcus [13-17]. However, there is considerable variation in occurrence of this enzymatic activity among species and strains. [Pg.333]

HSDH activities are found rather widely distributed among intestinal bacteria including members of the genera Bacteroides, Eubacterium, Clostridium, Bifidobacterium and Escherichia [25-29]. In the human intestinal microflora, 7a-HSDH appears to be much more widely distributed than 3a-HSDH or 12a-HSDH [17]. Individual species may contain from 1 to 3 different stereospecific HSDHs. However, there is considerable variation between strains regarding the presence and extent of HSDH activity. [Pg.335]

Aries and Hill (58), during the course of their investigations of degradation of steroids by intestinal bacteria, prepared partially purified extracts of several microorganisms, such as Clostridium, Bacteroides, Bifidobacterium, and Enterobacterium, possessing enzymatic activity catalyzing the oxido-reduction of the la- and 12a-hydroxy groups in bile acids, as well as the 7-... [Pg.269]

Salazar, N., Gueimonde, M., Hemandez-Barranco, A. M., Ruas-Madiedo, P., Clara, G. (2008). Exopolysaccharides produced by intestinal Bifidobacterium strains act as fermentable substrates for human intestinal bacteria. Applied and Environmental Microbiology, 74(15), 4737-4745. [Pg.37]

Bifidobacterium Fermentation. A unique form of lactic fermentation has been observed in members of the genus Bifidobacterium. These anaerobic bacteria are commonly found in the intestinal tract and feces of human infants and adults, as well as many animal species. Most Bifidobacterium spp. can acidify milk, and they produce acetic and lactic acids in an approximate 3 2 molar ratio when growing on glucose (Buchanan and Gibbons 1974). The Bifidobacterium fermentation (Fig-... [Pg.670]

The normal balance of intestinal flora may be maintained or restored to normal from an unbalanced state by a well-balanced diet or by oral bacteriotherapy. Oral bacteriotherapy, using intestinal strains of lactic acid bacteria (LAB), such as Lactobacillus and Bifidobacterium, can restore normal intestinal balance and produce beneficial effects. [Pg.261]

CLA can also be synthesised in the human colon. Some bacterial strains normally present in the human large intestine (Lactobacillus, Propionibacterium and Bifidobacterium species and some Clostridium-like bacteria) have been found to metabohse linoleic acid and form CLA that is converted further to trans-1118 1 in vitro. Vaccenic acid may be also a precursor of rumenic acid (cis-9,trans-ll CLA) in human tissues (Devillard, McIntosh, Duncan, Wallace, 2007). [Pg.77]


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