Sweet whey is generated as a dilute liquid by-product of cheese making. It contains lactose, proteins and minerals. Sweet whey can be fractionated using membranes.
The most common product using this process is a liquid stream that contains at least 34% dry matter protein. The concentrated form is spray dried into a powder, often referred to as 34, or 34% whey protein concentrate (WPC).
This product is the same as WPC 34, except that it contains at least 80% dry matter protein and requires additional membranes and a technique called diafiltration.
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