Digestion of disaccharides occurs at ?
Mouth
Stomach
Small intestine
Large intestine
Ans. is 'c' i.e., Small intestine Digestion of disaccharides (maltose, sucrose and lactose) occurs by the enzymes present in brush border os small intestinal epithelial cells. Maltase (a-glucosidase) breaks 1: 4 linkages in maltose and maltotriose and releases glucose (two molecules of glucose from maltose and three molecules of glucose from maltotriose). Isomaltase (a-limit dextrinase) breaks 1 : 6 a linkages of alpha-limit dextrin and releases glucose. Isomaltase dextrinase) is the only enzyme that attacks 1 : 6a linkage. Sucrose is hydrolysed into fructose and glucose by sucrase (an enzyme present in brush border of intestinal epithelium). Lactose is hydrolysed into galactose and glucose by lactase ((3-glucosidase). Trehalase hydrolyzes trehelose (a 1:1 a - linked dimer of glucose) into two glucose molecules. Trehalose is found in mushrooms.