Degradation of silk fibroin.

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  • HIRABAYASHI KIYOSHI
    Faculty of Technology, Tokyo University of Agriculture and Technology
  • YANAGI YOSHIKUNI
    Faculty of Technology, Tokyo University of Agriculture and Technology
  • KAWAKAMI SHOTARO
    Faculty of Technology, Tokyo University of Agriculture and Technology
  • OKUYAMA KENJI
    Faculty of Technology, Tokyo University of Agriculture and Technology
  • HU WEIJIN
    Faculty of Technology, Tokyo University of Agriculture and Technology

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Other Title
  • 絹フィブロインの分解
  • 絹フィブロインの分解〔英文〕
  • キヌ フィブロイン ノ ブンカイ エイブン

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Degradation of silk fibroin induced by UV-irradiation at a wavelength of 254nm and 365nm was studied by stress-strain measurements, thermal analysis, X-ray diffraction and amino acid analyses.<br>Fibroin was prepared by degumming of silk fabrics (HABUTAE, 16 Meauke) with potassium thiocyanate. The short wavelength (254nm) induced a larger decrease of the mechanical properties than the longer wavelength (365nm). The degradation temperature of silk fibroin was not related to UV irradiation. The weight loss of fibroin increased slowly with the irradiation time. The weight loss was mainly caused by the evolution of ammonia gas generated by the photochemical degradation of the amino acids composing fibroin.<br>In the first stages of irradiation, the decomposition of fibroin occured in the amorphous region and later extended to the crystalline region.

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