Silk Fibroin The resource and characteristics of silk fibroin:With the adoption of modern bio-technology, silk essence, unglued from silk, derives from the hydrolyzation of fibroin protein, which creates polypeptide and amino acid. Multiple amino acid and dipeptide, tripeptide are extracted from natural silk. With abundance of 18 kinds of amino acid, namely, glycin, alanine, alpha-amino-beta- ...