A new Ca2+-alginate hydrogel with improved physical stability is prepared by covalent tethering of catechols. Ionic to covalent bond transition spontaneously occurs in physiological conditions. It is found that the kinetics of leaching out of Ca2+ ions from the chelated carboxylates and oxidative intercatechol cross-linking is similar, successfully maintaining the original physical shapes without conventionally performed treatment of cationic polymers on the surface Ca2+-alginate hydrogels.
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Hong et al. (2015) studied this question.
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