Objective To prepare chitosan nanocomposite gene vector and investigate its physico-chemical property,cytotoxicity,stability and in vitro transfection efficiency.Methods Chitosan nanoparticles entrapping complexes of polyethylenimine(PEI)/DNA were prepared by a complex coacervation method,and measured for size and Zeta potential by nanoparticle size analyser,observed for morphology by transmission electron microscopy,and determined for cytotoxicity by MTT method.The prepared chitosan nanocomposite gene vect...