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The almost degraded silk fibers show deformed infrared spectra compared with that of reference silk fibers. In this report, the polarized micro infrared spectroscopy was used to clarify the reason for the deformation of spectrum. Since the polarized light is sensitive to the change in the secondary structure of fibroin molecules, the change in the crystallinity and the peak intensity ratio of spectrum of degraded silk fibers were evaluated. At first, the axis of single silk fiber was set parallel to the polarized light of 90°, and the spectra was measured successively by changing the angle of diamond cell until the final position of 0°, namely perpendicular to the axis of single silk fiber. As a result of the experiments, it was found that the crystallinity increases with progress in degradation. Furthermore, the crystallinity is higher in the direction for 90° compared with that for 0°. Furthermore, the peak intensity ratio, Amide I / Amide II, was adopted as the measure of degradation. The measured value was generally higher compared with that of reference silk fibers. The correlation between the crystallinity and Amide I / Amide II ratio was also investigated.

The Evaluation of Degraded State of Archaeological Silk Fibers Using Polarized Infrared Micro Spectroscopy