Silk Fibroin Powder Silk Peptide Powder is a kind of water-soluble polypeptide substance by the degradation of silk fibroin protein, whose molecular weight is between 500 and 10000, which is white powder with good water-solubility, the ninhydrin reaction is positive. Prodcut Name: Silk Fibroin powder Specification:  90% Appearance:  White powder Mesh size: 80 Mesh                            Grade: Pharmaceuticals Ingredients Brand Name: LS-Herb Test …