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The paper follows the chemical modification of different sorts of starch after grafting and hydrolysis reactions. The grafting reaction of acrylonitrile on the starches from potato, wheat and rice, took place using Ce(SO4)2 in H2SO4 0.4 M, as initiator system. Even if the grafting reaction with this initiator system has been already discussed in the literature, this paper aims a comparison of the product characteristics as a function of starch source. The synthesis of water soluble polymers was performed by the basic hydrolysis of the grafted starches. The grafted and hydrolyzed copolymers were characterized by FT-IR and H-NMR spectroscopy, scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDAX).

Comparative chemical modification of starches as a function of their origin: synthesis and analysis