Abstract
Mussel-inspired polymers have emerged as attractive candidates for the synthesis of injectable hydrogels with tissue-adhesive properties. In these systems, polymer crosslinking occurs via the oxidative coupling of catechol groups grafted on the polymer backbone, performed in the presence of an enzyme or a chemical oxidant. Here, we show that catechol-modified hyaluronic acid (HA-CA) can self-crosslink in physiological conditions without any requirement of oxidizing reagents. A careful rheological analysis of gelation of HA-CA solutions indicated that both the degree of substitution and the molar mass of HA-CA are key parameters controlling the gelation kinetics. Interestingly, the gelation time could be dramatically lowered by photo-oxidation of catechol using visible light in the presence of eosin Y as a photosensitizer. This strategy can be advantageously used to manage viscosity and gelation kinetics during injection, which paves the way for various biomedical applications of HA-CA including wound closure and healing as well as drug delivery.
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Acknowledgements
This work was financially supported by a Grant-in-Aid for JSPS Fellows KAKENHI (Grant No. 265612). We are grateful to Prof. M. R. Block for the cell viability testing of the HA-CA hydrogels. We thank Eric Bayma-Pecit for his technical help in the rheological experiments.
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Sato, T., Aoyagi, T., Ebara, M. et al. Catechol-modified hyaluronic acid: in situ-forming hydrogels by auto-oxidation of catechol or photo-oxidation using visible light. Polym. Bull. 74, 4069–4085 (2017). https://doi.org/10.1007/s00289-017-1937-y
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DOI: https://doi.org/10.1007/s00289-017-1937-y