Viscoelastic properties of biopolymer hydrogels determined by Brillouin spectroscopy: A probe of tissue micromechanics.

Viscoelastic properties of biopolymer hydrogels determined by Brillouin spectroscopy: A probe of tissue micromechanics.
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DOI:
10.1126/sciadv.abc1937
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发表时间:
2020-10
期刊:
影响因子:
13.6
通讯作者:
Palombo F
Palombo F
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Bailey M;Alunni-Cardinali M;Correa N;Caponi S;Holsgrove T;Barr H;Stone N;Winlove CP;Fioretto D;Palombo F

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Gelatin hydrogels cover a wide range of microenvironments that are relevant for bioapplications of Brillouin elastography. Many problems in mechanobiology urgently require characterization of the micromechanical properties of cells and tissues. Brillouin light scattering has been proposed as an emerging optical elastography technique to meet this need. However, the information contained in the Brillouin spectrum is still a matter of debate because of fundamental problems in understanding the role of water in biomechanics and in relating the Brillouin data to low-frequency macroscopic mechanical parameters. Here, we investigate this question using gelatin as a model system in which the macroscopic physical properties can be manipulated to mimic all the relevant biological states of matter, ranging from the liquid to the gel and the glassy phase. We demonstrate that Brillouin spectroscopy is able to reveal both the elastic and viscous properties of biopolymers that are central to the structure and function of biological tissues.
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