(b) Skim milk contains a very small amount of milkfat and most of the
(2) Curds and whey. If milk sours, it will eventually separate into curds and
(a) Curd contains most of the milkfat, casein, and fat-soluble vitamins.
(b) Whey contains most of the water, lactose, whey protein, and the
The water-soluble vitamins are vitamin B complex and vitamin C.
a. Vitamin B Complex. The vitamin B complex includes the following:
(1) Thiamine, whose absence from the diet causes nervousness and
eventual paralysis in humans.
(2) Riboflavin (vitamin B2 or G), which is necessary for body growth.
(3) Pyridoxine (vitamin B6), which prevents cracking of the lips and corners of
(4) Niacin, which is necessary for body growth and is normally one of the
vitamins recommended in certain cases of pellagra (dermatitis).
(5) Biotin, necessary for normal skin and intestinal development.
(6) Folic acids, which prevent anemia.
(7) Vitamin B12, which is essential for normal fat metabolism.
b. Vitamin C. This vitamin, which is also called ascorbic acid, prevents certain
diseases and skin disorders, such as scurvy.
Enzymes are protein-like substances that have the ability to speed or retard
chemical changes without themselves being altered in the reaction. There are seven
important enzymes in milk: phosphatase and lipase (the two most important), catalase,
peroxidase, lactase, amylase, and galactase.