Nanoscale Swelling Heterogeneities in Type I Collagen Fibrils

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• 作者：Eike-Christian Spitzner ; Stephanie R枚per ; Mario Zerson ; Anke Bernstein ; Robert Magerle
• 刊名：ACS Nano
• 出版年：2015
• 出版时间：June 23, 2015
• 年：2015
• 卷：9
• 期：6
• 页码：5683-5694
• 全文大小：833K
• ISSN：1936-086X

文摘

The distribution of water within the supramolecular structure of collagen fibrils is important for understanding their mechanical properties as well as the biomineralization processes in collagen-based tissues. We study the influence of water on the shape and the mechanical properties of reconstituted fibrils of type I collagen on the nanometer scale. Fibrils adsorbed on a silicon substrate were imaged with multiset point intermittent contact (MUSIC)-mode atomic force microscopy (AFM) in air at 28% relative humidity (RH) and in a hydrated state at 78% RH. Our data reveal the differences in the water uptake between the gap and overlap regions during swelling. This provides direct evidence for different amounts of bound and free water within the gap and overlap regions. In the dry state, the characteristic D-band pattern visible in AFM images is due to height corrugations along a fibril鈥檚 axis. In the hydrated state, the fibril鈥檚 surface is smooth and the D-band pattern reflects the different mechanical properties of the gap and overlap regions.