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Silk protein aggregation kinetics revealed by Rheo-IR.

机译:Rheo-IR揭示的丝蛋白聚集动力学。

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摘要

The remarkable mechanical properties of silk fibres stem from a multi-scale hierarchical structure created when an aqueous protein "melt" is converted to an insoluble solid via flow. To directly relate a silk protein's structure and function in response to flow, we present the first application of a Rheo-IR platform, which couples cone and plate rheology with attenuated total reflectance infrared spectroscopy. This technique provides a new window into silk processing by linking shear thinning to an increase in molecular alignment, with shear thickening affecting changes in the silk protein's secondary structure. Additionally, compared to other static characterization methods for silk, Rheo-IR proved particularly useful at revealing the intrinsic difference between natural (native) and reconstituted silk feedstocks. Hence Rheo-IR offers important novel insights into natural silk processing. This has intrinsic academic merit, but it might also be useful when designing reconstituted silk analogues alongside other polymeric systems, whether natural or synthetic.
机译:丝纤维的显着机械性能源于当含水蛋白质“熔体”通过流动转化为不溶性固体时产生的多尺度分层结构。为了直接涉及丝蛋白的结构和功能,响应于流量,我们介绍了Rheo-IR平台的第一次应用,该平台与衰减的总反射率红外光谱耦合锥形和板流变。该技术通过将剪切稀疏连接到分子取向的增加,通过将剪切变薄连接到分子取向的增加,剪切增厚影响了丝蛋白的二级结构的变化来提供丝绸处理的新窗口。另外,与丝绸的其他静态表征方法相比,Rheo-IR在揭示了天然(天然)和重构的丝绸原料之间的内在差异特别有用。因此,Rheo-IR提供了对天然丝绸加工的重要洞察力。这具有内在的学术优点,但在设计与其他聚合物系统以及自然或合成的其他聚合物系统的重构丝绸类似物时,它也可能有用。

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