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Preparation And Property Of Starch Nanoparticles Reinforced Aldehyde–hydrazide Covalently Crosslinked PNIPAM Hydrogels

Shanshan Li, Y. Xia, Y. Qiu, X. Chen, S. Shi
Published 2018 · Materials Science

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Injectable, de-crosslinkable, and thermosensitive hydrogels are obtained by hydrazide-functionalized poly(N-isopropylacrylamide) and aldehyde-functionalized dextrin through in situ crosslinked method. Natural based and degradable starch nanoparticles (SNPs) are used as fillers in order to improve mechanical property of hydrogels. Internal morphology, dynamic modulus, thermosensitivity property, de-crosslinking performance, drug release, and in vitro cytotoxicity of hydrogels are investigated. Results show that SNPs disperse well throughout hydrogel and have no significant influence on gelation time and de-crosslinking performance. Elasticity property of composite hydrogel prepared from 9.0 wt % precursors with 1.5 wt % fillers is improved significantly by SNPs and maximum storage modulus reaches 399.2 kPa, but 89.6 kPa of unreinforced hydrogels. Hydrogels exhibit good thermosensitive performance at alternating cyclic temperature of 25 and 37 °C. Doxorubicin hydrochloride-loaded hydrogels can release more than 25 days. No significant cytotoxicity to L929 fibroblast cells is observed through a CCK-8 assay for hydrogels, precursors, and SNPs. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 135, 45761.
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