... : ItemsRequirementAppearancePale yellow or brown powder, special odor, deliquescence in airAmino acids / Total nitrogen>75%Total nitrogen13.5% minWeight Loss on Drying6 ... is up to above 75%, and total free essential amino acids account for 40% in this product. 2. Silkworm Pupa ... and contains a variety of amino acids necessary for health, including 8 kinds of amino acids essential to human body. Up to ...