Reductone Formation from Sugars and Ascorbic Acid in Solids and Aqueous Solutions by Gamma Radiation

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The formation of reductone from sugars and ascorbicacid in solids and aqueous solutions by 60Co gammaradiationwas examined by measuring both amounts of acireductoneand reductonate with dose (in range of total dose 1×104-1×108 R). Decomposition rate of these substances, color, changes of acidity, UV absorption spectra, paperchromatograms were also compared. It was found that aci-reductone was produced from sugar in the dose above 106 R in 0.1 M solution and 107 R in solid respectively. The maximum yield of acireductonein 0.1 M sugar solutions were 3.9×10-5, 1.7×10-4 and 6.4×10-3 M in 106, 107 and 108 R respectively.The production of reductonate was also similar to aci-reductone formation but the yield of the former wasmore higher than the latter. On the other hand, ascorbic acid was, in contrast to solid, rapidly decomposed by gamma-radiation in dilute solution (2×10-3M), and oxidized to dehydroascorbicacid and thereafter to 2, 3-diketogulonic acid.No other reductone was observed from the radiolysis of ascorbic acid. In view of the above facts it seems that in the dose range of food irradiation (less than 5×106 R)ascorbic acid was damaged inevitably but the quantity of reductone produced from sugar was very little and quality of food would not be affected by the reductone.
日本食品照射研究協議会の論文