title: A biomimetic chitosan composite with improved mechanical properties in wet conditions.
abstract: Chitosan is one of the most widely used structural polymers for biomedical applications because it has many favorable properties. However, one of the most critical drawbacks regarding the use of chitosan as a biomedical material is its poor mechanical properties in wet conditions. Here, we designed a method to improve the mechanical properties of chitosan in wet conditions and minimized the swelling behavior of chitosan film due to water adsorption by mimicking the sclerotization of insect cuticles and squid beaks, that is, catechol-meditated crosslinking. The biomimetic chitosan composite film was prepared by mixing chitosan with L-3,4-dihydroxyphenylalanine (DOPA) as a catecholic crosslinker and sodium periodate as an oxidant. The catechol-meditated crosslinking provided a sevenfold enhancement in the stiffness in wet conditions compared to pure chitosan films and reduced the swelling behavior of the chitosan film. This strategy expands the possible applications for the use of chitosan composites as load-bearing biomaterials.
authors: POSTECH Ocean Science and Technology Institute, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, South Korea.
authors: Dongyeop X
authors: DX
authors: Oh
authors: Dong Soo
authors: DS
authors: Hwang
mesh_terms: D000818:Animals; D001000:Ants / Q000737:chemistry; D001672:Biocompatible Materials / Q000737:chemistry*; D001696:Biomechanical Phenomena; D048271:Chitosan / Q000737:chemistry*; D049832:Decapodiformes / Q000737:chemistry; D004295:Dihydroxyphenylalanine / Q000737:chemistry; D008422:Materials Testing; D010084:Oxidation-Reduction; D013718:Tensile Strength
chemical_list: D001672:Biocompatible Materials; D004295:Dihydroxyphenylalanine; D048271:Chitosan