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首页> 外文期刊>Journal of Fiber Science and Technology >Changes in the Higher-Order Structure of Silk Fibers Obtained by Forcibly Spinning as Compared to Those Obtained by the Naturally Spinning System of the Bombyx mori Silkworm
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Changes in the Higher-Order Structure of Silk Fibers Obtained by Forcibly Spinning as Compared to Those Obtained by the Naturally Spinning System of the Bombyx mori Silkworm

机译：与家蚕自然纺丝系统相比，强力纺丝获得的丝纤维高级结构的变化

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Forcibly spinning was applied to fully grown Bombyx mori silkworm larvae, and the higher-order structure of the as-spun filaments was analyzed by Fourier-transform infrared spectroscopy (FT-IR) and wideangle X-ray diffraction (WAXD). The FT-IR spectra of the as-spun filaments were similar to those of naturally spun cocoon filaments. This indicated that the forcibly spun filaments were comprised of β -sheets. However, FT-IR spectra were obtained under ATR mode. Thus, the spectra basically reflected the structure of sericin layer as well as inside fibroin. In the WAXD diagram of forcibly spun filaments, 002 and 101 reflections of the silk-1 crystal were overlapped on the silk-2 crystal reflections, while only silk-2 crystal modification occurred in naturally spun ones. The preferential silk-2 crystal modification was disordered although the shear force loaded by the forcibly spinning on the liquid silk in the duct of a silkworm was thought to be high enough to allow modification for the preferred silk-2 crystal. In addition, the sericin layer of the forcibly spun filaments was so brittle that numerous cracks were generated perpendicular to the fiber axis when the filaments were slightly stretched, suggesting that molecular orientation in the sericin layer of the forcibly spun filaments was extremely low. These structural changes observed in the forcibly spun filaments are due to the interference of forcibly spinning with the naturally spinning system of a Bombyx mori silkworm. For further understanding the inherent spinning system of a Bombyx mori silkworm, the schematic representation was proposed based on the previous studies, and the structural changes observed in the forcibly spun filaments were discussed in relation to the fiber formation process.
机译：将强力纺丝应用于完全生长的家蚕幼虫，并通过傅立叶变换红外光谱（FT-IR）和广角X射线衍射（WAXD）分析初生丝的高阶结构。初纺长丝的FT-IR光谱与天然纺茧丝的相似。这表明强力纺丝由β-片组成。然而，FT-IR光谱是在ATR模式下获得的。因此，光谱基本上反映了丝胶蛋白层以及纤维蛋白内部的结构。在强力纺丝的WAXD图中，丝1晶体的002和101反射与丝2晶体反射重叠，而自然纺丝中仅丝2晶体发生了改性。尽管认为通过强力旋转在家蚕的导管中的液体丝上施加的剪切力足够高以允许对优选的silk-2晶体进行修饰，但是优选的silk-2晶体修饰无序。另外，强力纺丝的丝胶蛋白层太脆，以至于当细丝拉伸时，垂直于纤维轴的方向上产生许多裂纹，这表明强力纺丝的丝胶蛋白层中的分子取向极低。在强力纺丝中观察到的这些结构变化是由于强力纺纱与Bombyx mori蚕的自然纺丝系统的干扰所致。为了进一步了解家蚕的固有纺丝系统，在先前研究的基础上提出了示意图，并讨论了与纤维形成过程有关的强力纺丝中观察到的结构变化。

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