Iminoboronate Ester Cross-linked Hydrogels with Injectable, Self-healing and Multi-responsive Properties

Xiao-ya Ding; Yu Wang; Gao Li; Chun-sheng Xiao; Xue-si Chen

doi:10.11777/j.issn1000-3304.2019.19015

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Iminoboronate Ester Cross-linked Hydrogels with Injectable, Self-healing and Multi-responsive Properties

Research Article | 更新时间：2021-01-26

- Iminoboronate Ester Cross-linked Hydrogels with Injectable, Self-healing and Multi-responsive Properties
- Acta Polymerica Sinica Vol. 50, Issue 5, Pages: 505-515(2019)
- 作者机构：
  
  1.中国科学院长春应用化学研究所中国科学院生态环境高分子材料重点实验室　长春 130022
  2.中国科学技术大学应用化学与工程学院　合肥 230026
  3.吉林省生物医用高分子材料工程实验室　长春 130022
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2019.19015
  CLC：
- Published：2019-5，
  
  Published Online：4 April 2019，
  
  Received：22 January 2019，
  
  Revised：27 February 2019，
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Xiao-ya Ding, Yu Wang, Gao Li, Chun-sheng Xiao, Xue-si Chen. Iminoboronate Ester Cross-linked Hydrogels with Injectable, Self-healing and Multi-responsive Properties. [J]. Acta Polymerica Sinica 50(5):505-515(2019)
DOI：

Xiao-ya Ding, Yu Wang, Gao Li, Chun-sheng Xiao, Xue-si Chen. Iminoboronate Ester Cross-linked Hydrogels with Injectable, Self-healing and Multi-responsive Properties. [J]. Acta Polymerica Sinica 50(5):505-515(2019) DOI： 10.11777/j.issn1000-3304.2019.19015.

摘要

报道了一种基于亚胺硼酸盐和硼酸酯键的动态共价交联水凝胶. 该水凝胶是通过2-甲酰基苯基硼酸(2-FPBA)与超支化聚乙烯亚胺(PEI)末端的伯胺基团和海藻酸钠(SA)糖单元上的顺式二醇反应形成亚胺硼酸盐-硼酸酯交联结构制得. 该水凝胶制备过程简单，所需高分子材料无需事先进行化学修饰；成胶条件温和，在室温下混合即可快速形成水凝胶. 流变学实验表明，水凝胶力学强度随PEI、2-FPBA和SA中反应基团比例的变化而变化. 同时，由于成胶所用化学键—亚胺硼酸盐和硼酸酯键—均为动态共价键，所得水凝胶还具有良好的自修复和可注射性能，可用作3D打印的水凝胶“墨水”. 体外降解实验结果表明，水凝胶对pH值、H

以及多种生物分子(如半胱氨酸、谷胱甘肽以及果糖等)都具有响应性，可用作蛋白药物响应性释放的载体. 进一步体外细胞毒性实验表明，水凝胶对细胞没有明显的毒性，具有良好的生物相容性.

Abstract

Injectable self-healing hydrogels are fancy candidates for biomedical applications

especially in such areas as minimally invasive surgical procedures

interventional therapy

and 3D bio-printing. Herein

a general and robust synthetic route to injectable self-healing hydrogels was developed based on a facile three-component reaction between the primary amine groups in hyperbranched poly(ethylenimine) (PEI)

2-formylphenylboronic acid (2-FPBA)

and the

cis

-diols in sodium alginate (SA). Briefly

2-FPBA reacted with PEI at first to generate a PEI/2-FPBA conjugate through forming iminoboronate bonds. The residual boronic acid groups in PEI/2-FPBA conjugate further reacted with

cis

-diols in the sugar unite of SA to generate iminoboronate ester linkages

thereby yielding the target product of hydrogels. The formation of iminoboronate and boronic acid ester bonds in iminoboronate ester linkages was confirmed by

H- and

B-NMR spectra. Dynamic rheological measurements revealed that the storage modulus (

′) of hydrogels was dependent on the feeding molar ratios of primary amine groups in PEI

2-FPBA

and sugar units in SA. Moreover

the resulting hydrogels exhibited excellent self-healing and shear-thinning properties

given that both iminoboronate and boronic acid ester bonds are well known as dynamic covalent bonds. Based on these attributes

the hydrogels prepared were expected to have successful application in 3D printing by serving as a hydrogel " ink”. In addition

their responsiveness towards pH

cysteine (Cys)

glutathione (GSH)

and fructose allowed an accelerated degradation process in acidic medium or in the presence of H

Cys

GSH

or fructose; Scanning electron microscopy (SEM) observation further suggested a significant destruction of their porous structure after a period of degradation. As a result

these hydrogels proved quite applicable for the delivery of protein therapeutics with multi-responsive drug release properties. Their minimal cytotoxicity towards A549

HeLa

and L929 cells was also confirmed by the MTT assay. It is worth mentioning that with 2-FPBA functioning as the cross-linker

many other amine groups-rich polymers

even natural proteins

can be used to fabricate dynamic hydrogels with injectable

seal-healing

and multi-responsive properties. Therefore

hydrogels prepared from the strategy proposed in this study may hold tremendous potentials in tissue engineering

drug delivery

and 3D bio-printing.

关键词

亚胺硼酸盐键硼酸酯键自修复水凝胶可注射性多重响应性

Keywords

IminoboronateBoronic acid esterSelf-healing hydrogelInjectabilityMulti-responsiveness

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