| Molecular Fundaments of Mechanical Properties of Spider Silk |
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| 作者姓名： | 潘志娟 刘敏 李春萍 李栋高 盛家镛 |
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| 作者单位： | College of Material Engineering Suzhou University，Suzhou，215021，College of Material Engineering Suzhou University，Suzhou，215021，College of Material Engineering Suzhou University，Suzhou，215021，College of Material Engineering Suzhou University，Suzhou，215021，College of Material Engineering Suzhou University，Suzhou，215021 |
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| 摘 要： | Dragline, framework and cocoon silk fibers of Araneus Ventricosus were used for this study. To investigate the microstructure mechanisms of stress-strain behavior of spider silk, firstly, amino acid compositions were analyzed and molecular conformations and crystallinity were measured with Raman spectra and X-ray diffraction respectively. The results showed that there were more amino acids with large side groups and polar ones in spider silk than those of Bombyx silk, and the amino acid distribution varied with different spider silk. The molecular structures were mainlyα-helix and β-sheet, and random coil andβ-turn existed as well. The proportions and arrangement of these conformations of dragline silk were different from framework and cocoon silk fibers. Microstructure was one of important factors of excellent mechanical properties of spider silk. Crystallinity of spider silk was very low, which implied that the roles of crystal on spider silk were not as great as other protein fibers.
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Molecular Fundaments of Mechanical Properties of Spider Silk |
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| PAN Zhi-juan,LIU Min,LI Chun-ping,LI Dong-gao
SHENG Jia-yong
College of Material Engineering Suzhou University,Suzhou.Molecular Fundaments of Mechanical Properties of Spider Silk[J].Journal of Donghua University,2003,20(4). |
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| Authors: | PAN Zhi-juan LIU Min LI Chun-ping LI Dong-gao
SHENG Jia-yong
College of Material Engineering Suzhou University Suzhou |
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| Institution: | College of Material Engineering Suzhou University,Suzhou,215021 |
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| Abstract: | Dragline,framework and cocoon silk fibers of Araneus Ventricosus were used for this study.To investigate the microstructure mechanisms of stress-strain behavior of spider silk,firstly,amino acid compositions were analyzed and molecular conformations and crystallinity were measured with Raman spectra and X-ray diffraction respectively.The results showed that there were more amino acids with large side groups and polar ones in spider silk than those of Bombyx silk,and the amino acid distribution varied with different spider silk.The molecular structures were mainly α-helix and β-sheet,and random coil and β-turn existed as well.The proportions and arrangement of these conformations of dragline silk were different from framework and cocoon silk fibers.Microstructure was one of important factors of excellent mechanical properties of spider silk.Crystallinity of spider silk was very low,which implied that the roles of crystal on spider silk were not as great as other protein fibers. |
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| Keywords: | spider silk Raman spectrum X-ray diffraction amino acid mechanical property |
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