Department of Polymer Materials, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
guifeili@shu.edu.cn (G.F.L.)
jbyin@oa.shu.edu.cn (J.B.Y.)
收稿:2020-07-14,
修回:2020-8-28,
录用:2020-8-31,
网络首发:2020-10-15,
纸质出版:2021-01-02
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Shi, Z.; Wang, Q.; Li, G. F.; Shou, Y. F.; Zong, H. J.; Yan, S. F.; Zhang, K. X.; Yin, J. B. Preparation and characterization of attractive poly(amino acid) hydrogels based on 2-ureido-4[1, H,]-pyrimidinone. Chinese J. Polym. Sci. 2021, 39, 327–336
Zhen Shi, Qi Wang, Gui-Fei Li, et al. Preparation and Characterization of Attractive Poly(amino acid) Hydrogels Based on 2-Ureido-4[1
Shi, Z.; Wang, Q.; Li, G. F.; Shou, Y. F.; Zong, H. J.; Yan, S. F.; Zhang, K. X.; Yin, J. B. Preparation and characterization of attractive poly(amino acid) hydrogels based on 2-ureido-4[1, H,]-pyrimidinone. Chinese J. Polym. Sci. 2021, 39, 327–336 DOI: 10.1007/s10118-021-2498-y.
Zhen Shi, Qi Wang, Gui-Fei Li, et al. Preparation and Characterization of Attractive Poly(amino acid) Hydrogels Based on 2-Ureido-4[1
Self-healing hydrogels with the shear-thinning property are novel injectable materials and are superior to traditional injectable hydrogels. The self-healing hydrogels based on 2-ureido-4[1
H
]-pyrimidinone (UPy) have recently received extensive attention due to their dynamic reversibility of UPy dimerization. However
generally
UPy-based self-healing hydrogels exhibit poor stability
cannot degrade
in vivo
and can hardly be excreted from the body
which considerably limit their bio-application. Here
using poly(
l
-glutamic acid) (PLGA) as biodegradable matrix
branching
α
-hydroxy-
ω
-amino poly(ethylene oxide) (HAPEO) as bridging molecule to introduce UPy
and ethyl acrylate polyethylene glycol (MAPEG) to introduce double bond
the hydrogel precursors (PMHU) are prepared. A library of the self-healing hydrogels has been achieved with well self-healable and shear-thinning properties. With the increase of MAPEG grafting ratio
the storage modulus of the self-healing hydrogels decreases. The self-healing hydrogels are stable in solution only for 6 h
hard to meet the requirements of tissue regeneration. Consequently
ultraviolet (UV) photo-crosslinking is involved to obtain the dual crosslinking hydrogels with enhanced mechanical properties and stability. When MAPEG grafting ratio is 35.5%
the dual crosslinking hydrogels can maintain the shape in phosphate-buffered saline solution (PBS) for at least 8 days. Loading with adipose-derived stem cell spheroids
the self-healing hydrogels are injected and self-heal to a whole
and then they are crosslinked
in situ via
UV-irradiation
obtaining the dual crosslinking hydrogels/cell spheroids complex with cell viability of 86.7%±6.0%
which demonstrates excellent injectability
subcutaneous gelatinization
and biocompatibility of hydrogels as cell carriers. The novel PMHU hydrogels crosslinked by quadruple hydrogen bonding and then dual photo-crosslinking of double bond are expected to be applied for minimal invasive surgery or therapies in tissue engineering.
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