期刊
CARBOHYDRATE POLYMERS
卷 250, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2020.116979
关键词
Dual-responsive; Injectable hydrogels; Shape-recovery; Self-healing; Dynamic recombination
资金
- National Key RD Plan [2018YFC1105900]
- Sichuan Province Key RD Program [2019YFS0007]
- Young Elite Scientists Sponsorship Program by CAST [2017QNRC001]
- Sichuan University Innovation Spark Project [2018SCUH0089]
In this work, 3, 3'-dithiobis (propanoic dihydrazide) modified and aldehyde-modified hyaluronic acid were respectively synthesized as precursor solutions to form redox and pH dual-responsive injectable hydrogels through dynamic acylhydrazone and disulfide linkages without exogenous stimulus conditions. The reversible sol-gel transition behavior of hydrogels could be repeated multiple times by adjusting DTT/H2O2 or HCl/TEA. Interestingly, the hydrogels shrank gradually when pH decreased, which improved significantly the storage modulus up to 8.4 times at pH 2. Furthermore, the hydrogel presented acid-switchable shape-recovery characteristics of self-healing by a dynamic recombination of acylhydrazone bonds. Moreover, the osmotic driving force derived from inner and outer concentration difference also affected the characteristic. The controlled release of bovine serum albumin (BSA) encapsulated in this hydrogel could be achieved in vitro under simulated pH/redox intracellular and intercellular microenvironment. This hydrogel could also promote chondrocytes proliferation.
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