Plant-inspired adhesive and tough hydrogel based on Ag-Lignin nanoparticles-triggered dynamic redox catechol chemistry

Donglin Gan, Wensi Xing, Lili Jiang, Ju Fang, Cancan Zhao, Fuzeng Ren, Liming Fang, Kefeng Wang and Xiong Lu ()
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Donglin Gan: Southwest Jiaotong University
Wensi Xing: Southwest Jiaotong University
Lili Jiang: Xihua University
Ju Fang: Southern University of Science and Technology, Shenzhen
Cancan Zhao: Southern University of Science and Technology, Shenzhen
Fuzeng Ren: Southern University of Science and Technology, Shenzhen
Liming Fang: South China University of Technology
Kefeng Wang: Sichuan University
Xiong Lu: Southwest Jiaotong University

Nature Communications, 2019, vol. 10, issue 1, 1-10

Abstract: Abstract Adhesive hydrogels have gained popularity in biomedical applications, however, traditional adhesive hydrogels often exhibit short-term adhesiveness, poor mechanical properties and lack of antibacterial ability. Here, a plant-inspired adhesive hydrogel has been developed based on Ag-Lignin nanoparticles (NPs)triggered dynamic redox catechol chemistry. Ag-Lignin NPs construct the dynamic catechol redox system, which creates long-lasting reductive-oxidative environment inner hydrogel networks. This redox system, generating catechol groups continuously, endows the hydrogel with long-term and repeatable adhesiveness. Furthermore, Ag-Lignin NPs generate free radicals and trigger self-gelation of the hydrogel under ambient environment. This hydrogel presents high toughness for the existence of covalent and non-covalent interaction in the hydrogel networks. The hydrogel also possesses good cell affinity and high antibacterial activity due to the catechol groups and bactericidal ability of Ag-Lignin NPs. This study proposes a strategy to design tough and adhesive hydrogels based on dynamic plant catechol chemistry.

Date: 2019
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DOI: 10.1038/s41467-019-09351-2

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