The Journal of Silk Science and Technology of Japan
Online ISSN : 1881-1698
Print ISSN : 1880-8204
ISSN-L : 1880-8204
Development of Soft Silk Fibroin Film
Yutaka KawaharaKeiko FurukawaTakeshi YamamotoMiwa MasudaTsutomu Furuzono
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2006 Volume 15 Pages 3-6


Silk fibroin cast film was prepared using a ternary solvent system of CaCl2/CH3CH2OH/H2O (1/2/8 in mole ratio). A drying temperature at casting influenced crysta1 structure of fibroin. When a drying temperature was set at 4 centigrade, the cast film became amorphous. When a drying temperature was set higher than 60 centigrade, a fibroin film of silk-II crystal was obtained. A fibroin film of silk-I crystal was obtained in the temperature range from 10 to 50 centigrade. Also, silk-I crystal was generated from random coil through exposure of an amorphous film to water vapor at 20 centigrade. As for the crysta1 transformation from silk-I into silk-II, the treatment with a glycerol solution was effective. In the course of the treatment a film showed self-thinning and self-expanding. The expansion ratio exceeded 30 % at maximum. The film produced accompanying self-expansion was ductile in nature. L929 cells were cultivated in MEMAM containing extracts from silk fibroin films. The extracts did not inhibit the multiplication of L929 cells.

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© 2006 by The Japanese Society of Silk Science and Technology
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