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Unpasteurized Whey Protein

Whey protein is one of the nonfat solids in milk. It is available as a protein supplement in powdered form and can be added to smoothies and shakes. Body builders and athletes often use whey protein as part of their training programs. Unpasteurized whey protein is isolated from milk that has not been treated with heat or sterilized through the process of pasteurization. Most of the whey protein on the market is from dairy cows, however there is also goat milk whey. Soy and almond milks do not contain whey proteins. Always check with your health professional before trying alternative diets and nutritional supplements.

Milk contains two types of protein: casein and whey. These are complex, long chains of amino acids that twist and fold when the amino acids interact with each other. Casein proteins are not as complex as whey and therefore stay intact during the pasteurization process. Whey proteins are more complex and twisted in structure. Whey proteins are made up of immunoglobulins, proteose peptone, bovine serum albumin, alpha lactalbumin and beta lactoglobulin. They are very sensitive to the heat of pasteurization -- 145 to 160 degrees Fahrenheit -- and begin to unravel and become denatured, according to the Raw-Milk-Facts website.

Unpasteurized milk, or raw milk, is not sterilized or heated to kill potential bacteria, such as E.coli, listeria and salmonella. In the U.S., about half the states do not allow raw milk to be sold; it is considered unsafe by the U.S. Food and Drug Administration and the Centers for Disease Control and Prevention. For those states where it is illegal to sell raw milk, some people have found ways to still obtain it for personal use, usually by owning a cow or through a co-op. Raw milk contains unpasteurized whey proteins that have not been denatured.

Whey protein is isolated during the process of making cheese. Enzymes are added to milk, causing it to curdle. The curds are separated from the liquid whey and used to make cheese. The whey is then dried into a powder and sold as a protein supplement. It contains all the essential amino acids and the branch-chained amino acid leucine, which may stimulate muscle synthesis, according to The National Dairy Council. Whey powders mix easily with liquids and are used to enhance exercise recovery and reduce muscle loss with aging.

Some companies claim to offer a raw whey protein powder that has been processed only with low heat instead of high temperature pasteurization. In this process, the milk is heated to 145 degrees Fahrenheit and held for 30 minutes to meet legal requirements, according to "The Sportsman-Review." Companies sell these whey protein powders as nondenatured raw milk proteins that have not undergone high temperature pasteurization. Whey proteins denature rapidly at temperatures above 158 degrees Fahrenheit, according to Harold E. Swaisgood of the University of North Carolina, Department of Food Science.

Article reviewed by Connie Bye Last updated on: Jul 3, 2012

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