It is also possible to standardize the casein fraction, not just the total protein content. (dairyprocessinghandbook.com)
Gluten proteins, which represent about 75 percent of the total protein content of wheat grain, are known to be the primary triggers of the immune response in celiac disease. (sciencedaily.com)
Amino acid spiking is essentially the practise of dumping high amounts of the cheapest, least valuable amino acids into the powder in order to cut costs while keeping the total protein content elevated. (seannal.com)