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The conformational transformation of a 30-residue peptide H(Ala-Gly-Ser-Gly-AIa-Gly)5OH, i.e., (AGSGAG)5, extracted from highly crystalline region of Bombyx mori (B. mori) silk fibroin was described by using the high resolution solid state 13^C NMR, and CD spectroscopies. Based on the conformation-dependent 13^C NMR chemical shifts of the Ala, Gly and Ser residues and the line-shape analysis of the conformation sensitive Ala Cβ resonance, the peptide revealed a strong preference for silk Ⅱ structural form, i,e,, an antiparallel fl-sheet structure (φ= - 140±20°and ψ= 135±20°) in solid state. On the contrary, the CD spectra of this peptide in the two non-native hexafluorinated fibre spinning solvents, hexafluoroisopropanol (HFIP) and hexafluoroacetone (HFA), exhibited the existence of an unusual tightly-folded conformation resembling 310-helix (φ=- 60±20° and ψ=-30±20°), as judged from the R ratio of [θ]222/[θ]203 in HFIP solution, whereas a dynamically averaged unordered structure in HFA, Taken together, the information inclined to hypothesis that the primary structure of the highly crystalline regions of B. mori silk fibroin may be easily accessible to the large conformational changes, which in turn may be critical for facilitating the structural transformation from unprocessed silk fibroin (silk I form) to processed silk fiber (silk Ⅱform). 相似文献
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桑蚕丝素蛋白的结构、形态及其化学改性 总被引:4,自引:0,他引:4
通过对桑蚕吐丝机构的描述,着重从高分子科学的角度介绍桑蚕丝和蚕丝素蛋白大分子的组成、形态及各种化学、物理性质,讨论了蚕丝素蛋白的纤维化机理,并简述了丝索蛋白纤维的化学接枝改性及其应用。 相似文献
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QiongCHENG TuZhiPENG XiaoBoHU CatherineF.YANG 《中国化学快报》2004,15(12):1473-1476
A novel fibroin modified electrode with ion recognition was reported. The membrane with isoelectric point of pH 4.5, was modified on graphite and carbon fiber electrodes. The pH-responsive ion recognition of the modified electrode was investigated by use of some neurocompounds. The fibroin carbon fiber electrode has been used for in-vivo determination. 相似文献
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纤维及织物因具有良好的柔性、透气性以及适宜的力学性能而成为人们日常生活必不可少的材料。随着柔性电子器件的快速发展,纤维及织物在其自身优势的基础上,开始被人们赋予智能化特征,使得智能纤维和织物逐渐在可穿戴领域占据一席之地。天然蚕丝具有产量大、机械性能优异和生物可降解的优势。近年来,面向智能应用的蚕丝基纤维与织物逐渐发展,被用于传感、致动、光学器件、能量收集和储能等领域。本文将首先介绍天然蚕丝的层级结构和性能,并介绍各种形貌结构的再生蚕丝材料;然后根据其在智能纤维及织物中应用领域的不同,详细阐述蚕丝基智能纤维及织物的制备方法、性能及工作机制;最后讨论进一步发展所面临的挑战与机会,并对未来前景进行展望。 相似文献
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在特定实验条件下, 蚕丝蛋白对细胞色素c表现出选择性吸附. 以蚕丝蛋白微填充柱为载体, 在流动系统中建立了细胞色素c的分离富集方法, 以分光光度法在410 nm处检测分离富集过程. 在进样流速低于10 μL/s时, 2 mL样品溶液(pH=5.6的水溶液)中5 μg/mL的细胞色素c可被蚕丝蛋白微柱完全吸附, 而在洗脱流速低于15 μL/s时, 200 μL NaCl溶液(1.0 mol/L)可将吸附的细胞色素c完全洗脱, 分离富集系数为10. 用本方法测定细胞色素c的线性范围为1.0~10.0 μg/mL, 检出限为0.33 μg/mL, 精密度RSD为2.5%(5 μg/mL, n=9). 此外, 还采用本文方法对人全血中的蛋白质进行了分离富集, 并用SDS-聚丙烯酰胺凝胶电泳验证了分离后蛋白的纯度. 相似文献
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