Lactose is the natural carbohydrate source and prebiotic compound found in
the milk of mammals, but large variations in lactase activity in the small
intestines of adult populations carl cause problems with its use. The value
of lactose can be increased by hydrolysis, bur even more valuable products
can be made by changing the structure of lactose and preventing its absorp
tion in the gut. Some of these nonabsorbable lactose derivatives are alread
y used in medical and functional food applications.
Calcium phosphate precipitation to the heat-transfer surfaces is one of the
oldest problems of the dairy industry but if precipitation is carried out
in controlled conditions, the precipitate can be further processed to form
milk calcium powder: Milk calcium can be used as a natural source of calciu
m in calcium-fortified dairy products.
The mineral and salty taste of whey has reduced its Else as a food ingredie
nt. The use of modern membrane technology offers a means of producing whey
salt as a by-product of whey demineralization. These otherwise wasted miner
als can then be used as a natural( mineral salt. Especially interesting is
the possibility of recycling the whey, salt into cheese, improving its nutr
itional status.