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• W2040880839 abstract "We have applied a uniform, shear-driven flow field (Couette flow) to study the effect of shear on the structure and conformation of aqueous bovine insulin, in situ and in real time, using intrinsic Tyr fluorescence and circular dichroism (CD) spectroscopy. The morphology of post-shear insulin samples was analyzed using atomic force microscopy (AFM). Both fluorescence and CD data show a shear-dependent deformation of bovine insulin in Couette flow. The shear effect is more pronounced with increasing shear rate. AFM images show large aggregates for insulin samples sheared at 200 and 400 s−1, whereas samples sheared at 600 s−1 contained fibrillar forms. We hypothesize that helical segments unfold upon extensional strain in the deformation flow field, resulting in unstructured, aggregation-prone insulin molecules. The occurrence of rotational diffusion in the direction of flow facilitates the coalescence of deformed insulin molecules into oligomeric aggregates. The size of the insulin aggregates diminished with increasing shear rate. This shows that the deformation cycle in fast flow fields retards the formation of large aggregates and promotes the ordering of deformed insulin molecules into the more stable fibrillar forms." @default.
• W2040880839 created "2016-06-24" @default.
• W2040880839 creator A5030359969 @default.
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• W2040880839 date "2009-06-01" @default.
• W2040880839 modified "2023-09-27" @default.
• W2040880839 title "Shear-Induced Deformation of Bovine Insulin in Couette Flow" @default.
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• W2040880839 doi "https://doi.org/10.1021/jp903522e" @default.
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