Chitosan is an antimicrobial, biodegradable and biocompatible natural polymer, commercially derived from the partial deacetylation of chitin. Currently modified chitosan has occupied a major part of scientific research. Modified chitosan has excellent biotic characteristics like biodegradation, antibacterial, immunological, metal-binding and metal adsorption capacity and wound-healing ability. Chitosan is an excellent candidate for drug delivery, food packaging and wastewater treatment and is also used as a supporting object for cell culture, gene delivery and tissue engineering. Modification of pure chitosan via grafting improves the native properties of chitosan. Chitosan grafted copolymers exhibit high significance and are extensively used in numerous fields. In this review, modifications of chitosan through several graft copolymerization techniques such as free radical, radiation, and enzymatic were reported and the properties of grafted chitosan were discussed. This review also discussed the applications of grafted chitosan in the fields of drug delivery, food packaging, antimicrobial, and metal adsorption as well as dye removal.

壳聚糖是一种抗菌，可生物降解和生物相容的天然聚合物，可从甲壳素的部分脱乙酰化获得。目前，改性壳聚糖已经占据了科学研究的主要部分。改性壳聚糖具有优异的生物特性，如生物降解，抗菌，免疫，金属结合和金属吸附能力以及伤口愈合能力。壳聚糖是药物递送，食品包装和废水处理的极佳候选者，也被用作细胞培养，基因递送和组织工程的支持对象。通过接枝改性纯壳聚糖可改善壳聚糖的天然特性。壳聚糖接枝共聚物显示出很高的意义，并广泛用于许多领域。在这篇评论中 通过自由基，辐射和酶等几种接枝共聚技术对壳聚糖的改性进行了报道，并讨论了接枝壳聚糖的性能。这篇综述还讨论了接枝的壳聚糖在药物输送，食品包装，抗菌和金属吸附以及染料去除领域的应用。