![]() ![]() The ingested lactose is not absorbed in the small intestine, but instead is fermented by bacteria in the large intestine, producing uncomfortable volumes of carbon dioxide gas. When there is not enough lactase to digest the amount of lactose consumed, produce some uncomfortable symptoms. Lactase breaks down the lactose, milk sugar, into glucose and galactose that can then be absorbed into the bloodstream. This inability results from a shortage of the enzyme lactase, which is normally produced by the cells that line the small intestine. Lactose intolerance is the inability to digest significant amounts of lactose, the predominant sugar of milk. See details on the galactose page towards the bottom. To recognize galactose look for the upward projection of the -OH on carbon # 4. The galactose and glucose units are joined by an acetal oxygen bridge in the beta orientation. Lactose is made from galactose and glucose units. It is also a by product in the the manufacture of cheese. ![]() ![]() Lactose or milk sugar occurs in the milk of mammals - 4-6% in cow's milk and 5-8% in human milk.
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