Amylopectin irradiation

Properties of Granular Potato Starch, Amylose, and Amylopectin after Irradiation with High-Energy Electrons"... 

For the irradiation of amylose it has been shown that the solvent may stabilize the irradiated matrix. Thus the scission of amylose in dimethyl sulfoxide is almost 15 times lower than that in water.92 Irradiation of the solution simultaneously containing amylose and amylopectin separated resulted in their grafting.93 Thus the results of irradiation depend on whether starch is radiolyzed in the solid, paste,... 

Zhai et al. ° studied PVA/starch hydrogels. Starch is composed of amylopec-tin and amylose and the effect of irradiation on both components is very different. Gel fraction decreases with increasing starch content. One starch fraction is physically entrapped in PVA gel while another fraction is chemically grafted on PVA chains. Further analysis showed that amylopectin is not intermiscible with PVA and could not react with PVA. On the contrary, amylose could be blended homogeneously with PVA and grafting reaction could occur. 

Dextrins obtained on y-irradiation of starch have been found to contain appreciable proportions of unidentified carbonyl residues. The properties of starch for starch-gel electrophoresis were improved by y-irradiation. The decreases in viscosity and iodine-absorption values, as well as the increased reducing properties, indicated that amylose and amylopectin are degraded by y-irradiation in the same way as native starches. Although each of the amylose and amylopectin components of amylomaize starch in y-irradiated and untreated samples was hydrolysed by a-amylase to the same extent, y-irradiated amylose had a low p-amylolysis limit. /-Irradiated amylomaize and com starches were hydrolysed to greater extents by a-amylase as the radiation dose was increased, and differences were detected in the products of enzymic degradation of amylomaize and corn starches following y-radiolysis. The water-soluble dextrins formed on y-irradiation of maize starch have been examined. ... 

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