Lactose is the sugar present in milk.
There are many people wh are lactose intolerant and will gain unpleasant digestive problems if they consume milk.
One Solution is to hydrolise* the lactose in milk which converts the diasaccharide lactose into the monosaccharides glucose and galactose.
(Industrially) This is carried out using the enzyme lactase.
Lactase can be immobilised in a gel, and milk is poured in a continous stream through a column containing beads of the immoblilised enzyme.
*Hydrolise = Breaking of the glycosidic bond by adding water
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