[Secretion-fiber transformation in fibroin of the natural silk by polarization-optical methods].

Structural changes in fibroin molecules upon transformation of the secret into a fiber were studied by the methods of birefringence in a longitudinal hydrodynamic field, optical rotatory dispersion, and circular dichroism. Fibroin fibers were obtained by drawing out the secret from the silk-secreting gland of silkworm moth Bombux mori. In this process, the formation of a longitudinal hydrodynamic field inside the gland was observed. The experimental data obtained make it possible to assess the degree of orientation and unfolding of macromolecules, as well as the conditions of the alpha-beta structural transition in fibroin chains.

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