Q: What constitutes a good whey protein supplement?
A: Contrary to those ubiquitous ads, the type of whey processing, whether filtration or ion exchange, has little to do with the ultimate quality of the supplement. All changes in PH levels or exposure to high temperatures affect protein quality by promoting denaturation, the permanent breakdown of the natural protein structures. You want to maintain the native structure of the various protein fractions contained in whey as much as possible. You're after biologically active proteins, and you want to avoid denaturing them because it would minimise their biological activity and, therefore, their value to customers. The manufacturers who supply the raw protein material vary in their processing techniques, so in many factories each batch of protein may differ in quality from the next. Even the way the cows are fed has an effect on protein quality. All things being equal, the factory supplying the whey determines the quality of the finished product. Some factories use harsher processing techniques that destroy the delicate whey protein fractions. You cannot, however, completely avoid denaturation because of the necessity of killing existing bacteria before filtering the whey. That involves pasteurisation, or the use of heat, which unavoidably alters some protein. As a consumer you want to look for a company that actively does everything it can to preserve the vital whey protein fractions. Some companies don't bother to analyse the batches of whey they receive and often get their whey from various sources. You also want to look for whey that contains the greatest amounts of those important whey protein fractions. Generally, whey protein concentrate contains more lactoferrin than whey protein isolates. In fact, the concentrates contain double the amount of health-promoting immunoglobulins than isolates have. In addition, the concentrates are less expensive. Thus, from both growth promoting and health standpoints whey protein concentrates may be best for bodybuilding purposes.
http://www.extremenutrition.co.uk/ne...nding-whey.php
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