Glassy state of native collagen fibril
Abstract
Our micromechanical experiments show that at physiological temperatures type I collagen fibril has several basic features of the glassy state. The transition out of this state [softening transition] essentially depends on the speed of heating v, e.g., for v=1 C/min it occurs around 70 C and is displayed by a peak of the internal friction and decreasing Young's modulus. The softening transition decreases by 45 C upon decreasing the heating speed to v=0.1 C/min. For temperatures 20-30 C the native collagen fibril demonstrates features of mechanical glassines at oscillation frequencies 0.1-3 kHz; in particular, the internal friction has a sharp maximum as a function of the frequency. This is the first example of biopolymer glassines at physiological temperatures, because well-known glassy features of DNA and globular proteins are seen only for much lower temperatures (around 200 K).
Keywords
Cite
@article{arxiv.1011.1070,
title = {Glassy state of native collagen fibril},
author = {S. G. Gevorkian and A. E. Allahverdyan and D. S. Gevorgyan and Chin-Kun Hu},
journal= {arXiv preprint arXiv:1011.1070},
year = {2015}
}
Comments
4 pages, 6 figures