The main source of enzymes that cleave disaccharides into monosaccharides is

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The enzymes that cleave disaccharides (such as sucrose, lactose, and maltose) into monosaccharides (such as glucose, fructose, and galactose) are located on the luminal membrane (facing the small intestine) of epithelial cells. These enzymes include sucrase, lactase, and maltase. The pancreas secretes enzymes (such as pancreatic amylase) that break down other types of carbohydrates, but not disaccharides specifically. The liver and salivary glands also do not play a significant role in disaccharide digestion. Gastric secretory cells produce enzymes that help break down proteins, but not carbohydrates.

The Main Source of Enzymes That Cleave Disaccharides into Monosaccharides