Relationship Between Milk Lactose andHeat StabilityConflicting data exists as to the role of lactose in theheat stability of milk. Increasing the lactose contentto about 65 g/L reduces heat stability measured byHCT. Removal of lactose by enzyme hydrolysis with -galactosidase was found to increase heat stability.This effect is considered to be related to the higherlevel of reactivity of reducing monosaccharides toparticipate in Maillard reactions compared to reducingdisaccharides such as lactose. Replacement oflactose by sucrose, a nonreducing disaccharide, wasalso found to reduce heat stability. Seasonal variationof lactose in milk has been reported.
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