Preparation of azidophenyl-low molecular chitosan derivative micro particles for enhance drug delivery.

Systems for delivering damaged tissue by immobilization of a bioactive substance or a protein drug for rapid recovery of a patient are being studied. To immobilize drugs using natural polymer, photo-immobilization method has been designed. Immobilization through photo-reaction is a new technology that stabilizes drugs or growth factors for sustained release. Introduction of photo-reactive functional groups into biocompatible natural polymers produces materials applicable to the medical field. Since chitosan is a natural polymer with stability and biocompatibility, this study attempts to use chitosan as a mediator of drug delivery. In addition, If the form of the immobilized biomaterial is made into a micro-sized particle, it can be utilized as an injectable material in addition to the stability of the photo-immobilization. In photo-immobilization in particle form, the probability of exposure to the enzyme in the body is lower than if it is injected into the body in the conventional free state. In addition, since it can be freely injected into a desired target site, it can be used for various medical applications. Therefore, it is expected that various effects of growth factors and drugs can be utilized and additional effects can be obtained by photo-immobilization together with various effects. (C) 2019 Elsevier B.V. All rights reserved.