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What is the chemical composition of milk?

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Quick Answer

Milk is primarily composed of water, comprising 85.5 to 89.5 percent of milk. The average percent of water in milk is 87 percent. The rest is composed of dissolved solids such as fat, carbohydrates and protein.

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Full Answer

Milk fat composes, on average, four percent of milk. Milk fat consists of over 10 different fats, but 98 percent of milk fat consists of triacyl glycerides. Lactose content averages 4.8 percent of milk. Lactose is a carbohydrate consisting of glucose and galactose, which are both sugars. Milk proteins comprise 3.4 percent of milk. Caseins comprise approximately 80 percent of those milk proteins, while whey accounts for approximately 19 percent. Milk salts and vitamins such as A, B. C, D, E and K are also present in trace amounts.

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