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Lactose is a sugar like glucose or fructose and so cannot be denatured as can enzymes, which are proteins. However, if you heat lactose long enough it will caramelize (oxidize), like the sugar in sweetened condensed milk does when super heated.

Heating lactose-free milk does denature the enzyme it contains to digest lactose, lactase, and inhibit it from working further.

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14y ago

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