... , defatted soybean meal. Soybeans are processed into three kinds of proteins: soy flour, concentrates, and isolates, which are the starting materials ... breakfast cereals, pastas, and pet foods. Soy protein islate is the most refined form of soy protein and is mainly used in meat ... is a highly refined or purified form of soy protein with a minimum protein content of 90% on a moisture-free basis. ...