Dopamine-Initiated Photopolymerization for a Versatile Catechol-Functionalized Hydrogel

Hoang Linh Bui, Cao Tuong Vi Nguyen, Wen Ya Lee, Shao Chuan Huang, Po Fan Chen, Ming Ying Lan, Chun Jen Huang

Research output: Contribution to journalArticlepeer-review

Abstract

Biomimetic catechol-functionalized hydrogels have attracted substantial attention due to their potential in a variety of biomedical applications, such as tissue repair and regeneration, drug delivery, and antimicrobial and antifouling applications. In this study, a one-pot strategy for fabrication of functional catecholic hydrogels using dopamine as a photoinitiator was developed. Under UV irradiation in an acidic solution, dopamine generates free radicals, likely semiquinone radicals, to trigger the addition polymerization, following pseudo-first-order kinetics. The dopamine-initiated photopolymerization provides a straightforward and facile approach and, in addition, prevents the undesirable oxidation to catecholic groups. Superhydrophilic sulfobetaine methacrylate (SBMA) was applied for developing biocompatible hydrogels. 1H nuclear magnetic resonance, UV-vis spectroscopy, gel permeation chromatography, and rheological studies were conducted to explore the polymerization mechanism and optimal experimental conditions in terms of pH, UV doses, and the concentration of dopamine. The unique properties of the resultant catechol-functionalized pSBMA hydrogels were demonstrated by enhanced mechanical properties through metal-catechol complexation, self-healing and injectable capability, high adhesiveness, and fouling resistance. Consequently, the synthetic strategy to design catecholic hydrogels can leverage the use of dopamine in a variety of applications.

Original languageEnglish
Pages (from-to)6268-6279
Number of pages12
JournalACS Applied Bio Materials
Volume4
Issue number8
DOIs
StatePublished - 16 Aug 2021

Keywords

  • antifouling property
  • dopamine-initiated photopolymerization
  • medical adhesive
  • metal-catechol complexation
  • mussel-inspired polymer

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