a Dadkhah - Laboratory of Dendrimers and Biopolymers, Faculty of Chemistry, University of Tabriz. Tabriz, PO Box: ۵۱۶۶۶, Iran
H Namazi

Recently considerable effort has gone in to the development of bionanoparticles from the biopolymers. Some of the polysaccharides such as starch, are a potential renewable sources of nano sized state. It is well known that the native starch granules contain more or less concentric growth ring or shells or layers that are readily visible by optical or electron microscopy. Molecular chain of amylose almost perpendicular to these growth rings and to the surface of the granules. This onion-like structure has been attributed to the chemical differences between the layers, differences in the density of deposition of molecules of starch, and differences in crystallinity. And aqueous acids can be employed to hydrolyze the amorphous sections found in these naturally occurring polysaccharides and released, resulting in individual mono crystalline bionanoparticles. . The object of this treatment is to dissolve away regions of low lateral order so that the water insoluble in to a stable suspension by subsequent vigorous mechanical shearing action. In the course of our research, the new graft copolymer with having well defined structure based on starch nanoparticles and ε-caprolactone (CL) via ROP graft polymerization was synthesized. This method not only offers an effective and safe way for chemical modification but also could develop fully biodegradable material with potential application in medical applications