Bifidobacteria play an important role in maintaining human health, and suppress harmful bacteria by controlling the pH of the large intestine. About 14 strains of the Bifidobacteria have been isolated from the faeces ...Bifidobacteria play an important role in maintaining human health, and suppress harmful bacteria by controlling the pH of the large intestine. About 14 strains of the Bifidobacteria have been isolated from the faeces of infants nursed exclusively from the maternal milk （their ages less than 5 months） from commercial French yoghurt （active bifidus] and from milk （celia bifidus） on MRS medium （containing 0.05% cysteine-HC1, with nalidixic acid 2 mg rel）. A total of six strain are strict anaerobic and gram-positive Bifidobacteria, identified as, B. longum （60% of the samples） was the most frequently found species, followed by B. bifidum （21.0%）, B. breve （19%）. These strains were evaluated for potential use as probiotics based on their adhesion to intestinal epithelial cells, resistance towards acidic （resistance to low pH） and bile conditions, pH values ranging from 6.5 to 7, however, these strains are sensitive to the pH 8, Bifidobacterium are mesophiles with optimal growth at 36℃ to 41℃. All isolates studied have a fast growth in glucose.展开更多
Bifidobacteria represent the largest group of human intestinal bacteria. They have an important place in human health and represent the dominant group microflora of the newbom breast-fed. Following the behavior of str...Bifidobacteria represent the largest group of human intestinal bacteria. They have an important place in human health and represent the dominant group microflora of the newbom breast-fed. Following the behavior of strains of Bifidobacteria isolated from the breast-fed infants and from saline rehydration solution was considered in order to develop therapeutic fermented milk. Samples from newborn infants aged 10 months, or from a saline rehydration solution （Celia/Develop ORS） containing Bifidobacteria sold was used and isolated strains belonged to breve and longum species. Those strains showed preferences to neutral pH. They are mesophilic and tolerate high temperatures （42 ℃）. Glucose was commonly carbohydrate used in selective media for Bifidobacteria. Production of titratable acidity and therefore lowering the pH varies from one strain to another.展开更多
文摘Bifidobacteria play an important role in maintaining human health, and suppress harmful bacteria by controlling the pH of the large intestine. About 14 strains of the Bifidobacteria have been isolated from the faeces of infants nursed exclusively from the maternal milk （their ages less than 5 months） from commercial French yoghurt （active bifidus] and from milk （celia bifidus） on MRS medium （containing 0.05% cysteine-HC1, with nalidixic acid 2 mg rel）. A total of six strain are strict anaerobic and gram-positive Bifidobacteria, identified as, B. longum （60% of the samples） was the most frequently found species, followed by B. bifidum （21.0%）, B. breve （19%）. These strains were evaluated for potential use as probiotics based on their adhesion to intestinal epithelial cells, resistance towards acidic （resistance to low pH） and bile conditions, pH values ranging from 6.5 to 7, however, these strains are sensitive to the pH 8, Bifidobacterium are mesophiles with optimal growth at 36℃ to 41℃. All isolates studied have a fast growth in glucose.
文摘Bifidobacteria represent the largest group of human intestinal bacteria. They have an important place in human health and represent the dominant group microflora of the newbom breast-fed. Following the behavior of strains of Bifidobacteria isolated from the breast-fed infants and from saline rehydration solution was considered in order to develop therapeutic fermented milk. Samples from newborn infants aged 10 months, or from a saline rehydration solution （Celia/Develop ORS） containing Bifidobacteria sold was used and isolated strains belonged to breve and longum species. Those strains showed preferences to neutral pH. They are mesophilic and tolerate high temperatures （42 ℃）. Glucose was commonly carbohydrate used in selective media for Bifidobacteria. Production of titratable acidity and therefore lowering the pH varies from one strain to another.
