固体^<13>C NMRによる絹のアミノ酸組成とその物性 [in Japanese] Amino Acid Composition and Physical Properties of Silk with Solid-State ^<13>C NMR [in Japanese]
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To clarify the physical properties of silk yarns, cocoons and yarns of 12 different silk species were analyzed by solid-state <sup>13</sup>CNMR and their amino acid compositions and spin-lattice relaxation time (T<sub>1</sub>) were compared. The correlation between these values and physical values of yarns obtained by tensile strength measurements were discussed. Mole fraction of glycine (glycine⁄(glycine+alanine+serine+valine)) and T<sub>1</sub> of cocoons and yarns were different depending on the silk species. These values of cocoons in Japanese species scattered over a wide range and showed high correlation between them. On the other hand those of the Chinese species are in a narrow range , and T<sub>1</sub>'s are smaller than Japanese ones. Among them Shisensanmin, Kankokakuken and Ikoken showed extremely large mole fractions of glycine and small T<sub>1</sub>, meaning that these three species have excellent rigid but soft physical property. Mole fraction of glycine and T<sub>1</sub>'s of most of the Japanese species in yarns became larger than those of cocoons. Japanese species increased their flexibility by reeling, but Chinese and European species decreased it. Among them Matamukashi, Onichijira and Kankokakuken showed excellent rigid but soft physical property in yarns. Mole fraction of glycine showed high correlation with viscosity and T<sub>1</sub> showed high correlation with Young's modulus. In these correlations there are differences between Japanese and Chinese species.
- Sen-ito Kogyo
Sen-ito Kogyo 62(9), 191-198, 2006-09-10
The Society of Fiber Science and Technology, Japan