Substance obtained by acidic, alkaline, or enzymatic hydrolysis of Bombyx mori cocoon composed primarily of amino acids, peptides, and proteins. It may contain impurities consisting chiefly of carbohydrates and lipids along with smaller quantities of miscellaneous substances of biological origin.composed primarily of amino acids, peptides, and proteins. It may contain impurities consisting chiefly of carbohydrates and lipids along with smaller quantities of miscellaneous substances of biological origin.