Contribution a l'étude de l'action du rayonnement gamma sur l'amidon. Partie 2. Évolution de certaines caractéristiques biochimiques du grain d'amidon en fonction des conditions d'irradiation

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Abstract
Studies on the action of γ‐irradiation on starch. Part 2. Development of certain biochemical characteristics of the starch granule as a function of the irradiation conditions. Corn starch and potato starch were γ‐irradiated at different hydrations with largely varying irradiation dosis. After having outlined before the development of certain physicochemical properties of the starch granule, we have now examined the aspect of the radio‐chemical degradation of the units starch is composed off. The products generating 5 HMF, the COOH groups and the distribution of the modified anhydro‐glucose units in the alcohol‐soluble and the water‐soluble fractions were determined. The results show that the amount of modified anhydro‐glucose units, capable to form 5 HMF upon the action of acid, increases proportionnally to the irradiation dosis but independently on the water content of the irradiated sample. On the other hand, the development of the amount of COOH groups provides evidence for the important protecting role that the water plays in this kind of alteration. When the alcohol‐soluble fraction is expressed as a function of the water‐soluble fraction, but insoluble in alcohol, a linear relationship is obtained, which is independent on the irradiation dosis, on the hydration of the sample and the origin of the treated starch.