Biomaterial Database

Viable starter culture, beta-galactosidase activity, and lactose in duodenum after yogurt ingestion in lactase-deficient humans. 1989

P Pochart, and O Dewit, and J F Desjeux, and P Bourlioux

Laboratoire de Microbiologie, Faculté de Pharmacie, Université Paris XI, Châtenay-Malabry, France.

Ten lactose malabsorbers were intubated and given fresh or heated yogurt to which polyethylene-glycol (PEG) and spores of Bacillus stearothermophilus (SBS) had been added as internal standards. In duodenal samples taken after fresh yogurt ingestion, viable starter culture was detected for 60 min in 6 of 7 subjects and the ratio of microbial beta-galactosidase activity to SBS remained similar during this period to its value in the preingested yogurt. In the two groups ingesting fresh and heated yogurt respectively, ratios of lactose to PEG remained similar to preingested values for 90 min and duodenal pH remained less than 5.1. In vitro, at pH 5.0, beta-galactosidase activity in yogurt dropped by 80%. These data clearly show that after fresh yogurt ingestion, viable starter culture reaches the duodenum and contains beta-galactosidase activity. However, the buffering capacity of the yogurt that protects bacteria from acidic gastric secretion also prevents microbial beta-galactosidase from hydrolyzing lactose in the duodenum.

UI	MeSH Term	Description	Entries
D007778	Lactobacillus	A genus of gram-positive, microaerophilic, rod-shaped bacteria occurring widely in nature. Its species are also part of the many normal flora of the mouth, intestinal tract, and vagina of many mammals, including humans. Lactobacillus species are homofermentative and ferment a broad spectrum of carbohydrates often host-adapted but do not ferment PENTOSES. Most members were previously assigned to the Lactobacillus delbrueckii group. Pathogenicity from this genus is rare.
D007785	Lactose	A disaccharide of GLUCOSE and GALACTOSE in human and cow milk. It is used in pharmacy for tablets, in medicine as a nutrient, and in industry.	Anhydrous Lactose,Lactose, Anhydrous
D007787	Lactose Intolerance	The condition resulting from the absence or deficiency of LACTASE in the MUCOSA cells of the GASTROINTESTINAL TRACT, and the inability to break down LACTOSE in milk for ABSORPTION. Bacterial fermentation of the unabsorbed lactose leads to symptoms that range from a mild indigestion (DYSPEPSIA) to severe DIARRHEA. Lactose intolerance may be an inborn error or acquired.	Lactose Malabsorption,Alactasia,Dairy Product Intolerance,Hypolactasia,Milk Sugar Intolerance,Intolerance, Lactose,Malabsorption, Lactose
D008297	Male		Males
D003611	Dairy Products	Raw and processed or manufactured milk and milk-derived products. These are usually from cows (bovine) but are also from goats, sheep, reindeer, and water buffalo.	Dairy Product,Product, Dairy,Products, Dairy
D004386	Duodenum	The shortest and widest portion of the SMALL INTESTINE adjacent to the PYLORUS of the STOMACH. It is named for having the length equal to about the width of 12 fingers.	Duodenums
D005260	Female		Females
D005696	Galactosidases	A family of galactoside hydrolases that hydrolyze compounds with an O-galactosyl linkage. EC 3.2.1.-.	Galactosidase
D006358	Hot Temperature	Presence of warmth or heat or a temperature notably higher than an accustomed norm.	Heat,Hot Temperatures,Temperature, Hot,Temperatures, Hot
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man