广东费飘职业故本学院 Guangdong Inatitute of Textile Technology Structure Fibroin protein polymer a chain of amino acids forming a protein called fibroin composed of 15-18 different amino acids. Glycine alanine and serine occupy 86% of the polymer The side groups of the above 3 amino acids are small compared with those in wool 日 glycine:R=H 口 alanin e:r=-cha 口 Serine:R=-CH2OH Crystallize readily:70-75%Structure  Fibroin protein polymer ◼ A chain of amino acids forming a protein called fibroin composed of 15-18 different amino acids. ◼ Glycine, alanine and serine occupy 86% of the polymer ◼ The side groups of the above 3 amino acids are small compared with those in wool:  glycine: R = H  alanine: R = -CH3  Serine: R = -CH2OH ◼ Crystallize readily: 70-75%