The Circular dichroism(CD) spectrum of spider silk fibroin of Araneus Ventricosus major ampullate glands was measured,which indicated that the molecular conformations of spider silk in solution were primarily random coils and β-sheets.The Raman spectra were recorded for dragline silks next to the spigot and spun by a dropping spider.The results showed thatrandom coils were transformed into α-helix in the spider spinning process,andthat β-sheet orientation in dragline silk of a dropping spider was better than that of at the spigot because of dragging in air.The multiplicity of molecularstructures contributed excellent mechanical properties of dragline silk.%利用圆二色光谱测定大腹园蛛的丝蛋白,结果显示蜘蛛丝溶液中的构象最初是无规卷曲和β折叠,同时用拉曼光谱对蜘蛛吐丝口附近的牵引丝及垂直下落的蜘蛛牵引丝进行比较,结果表明在蜘蛛纺丝过程中无规卷曲转变为α螺旋,并且垂直下落的蜘蛛牵引丝由于受到空气中的拉伸其β折叠取向比吐丝口附近的牵引丝好.这些分子结构的多样性决定了蜘蛛牵引丝优异的机械性能.
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