Construction of collagen gel with high viscoelasticity and thermal stability via combining cross-linking and dehydration
Construction of collagen gel with high viscoelasticity and thermal stability via combining cross-linking and dehydration
复制标题
交联脱水相结合构建高粘弹性和热稳定性的胶原凝胶
DOI：
10.1002/jbm.a.36956
复制
发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Guoying Li
中科院分区：
文献类型：
--
作者：
Zhenhua Tian;Lirui Shen;Wentao Liu;Guoying Li
Collagen gel is widely used in tissue engineering due to excellent biological properties and swollen three‐dimensional network structure. To improve viscoelasticity and thermal stability, collagen gels consisting of fibrils were cross‐linked with glutaraldehyde and sequentially dehydrated via ethanol or heating (named as EGC or HGC, respectively). For EGC, ethanol replaced free and loosely bound water and then combined with tightly bound water, inducing the increase in hydrogen bonds and molecular interactions. Therefore, the thermal transition temperature (Tt) and storage modulus (G′) obviously increased from 47.3 ± 0.5°C and 0.1 kPa to 92.7 ± 0.8°C and 7.8 kPa, respectively. Unfortunately, the high deformation (γ> 60%) and low recovery percentage (R< 15%) reflected the poor anti‐deformation of gels due to the volatility of ethanol. For HGC, the entanglement and rigidity of fibrils increased owing to the contraction of cross‐linked fibrils and cohesive action of denatured collagen. As a result, HGC were more resistant to deformation and exhibited more elasticity than native collagen gel, accompanied by the fact thatG′ andRincreased to 28.8 kPa and 90.0% ± 0.7%. Additionally, HGC exhibited higherTt(121.4 ± 0.5°C) due to lower water content and higher collagen concentration.
