Browsing by Author "Jirathana, Poonsri"

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    Radiolysis of Pyrimidines in Aqueous Solutions: Part 2.—Product Formation in the Interaction of ea~, -H, -OH and C17- with
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1974, 70 (07), 1974) Infante, Gabriel A.; Jirathana, Poonsri; Fendler, Eleanor J.; Fendler, Janos H.
    Product yields in the reaction of e~, -H, -OH and Cl/ with uracil and uracil- have been determined quantitatively in 60Co y-irradiated aqueous uracil solutions in the presence of suitable scavengers. Good material balances between G(—uracil) and G(total products) have been obtained in all cases. The products determined were: uracil dimer, alloxan, alloxantin, uracil czj-glycol, uracil /ra/u-glycol, dialuric acid, isobarbituric acid, 5-hydroxydihydrouraciI, 6-hydroxydihydrouraciI, dihydrouracil, formylurea, 5-hydroxyhydantoin, parabanic acid, urea and alcohol adducts. Based on the yields of these products and the available literature, mechanisms are proposed and discussed.
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    Radiolysis of Pyrimidines in Aqueous Solutions: Part 3.’—Micellar Effects on Product Yields Formed in the Interaction of ea~, •H, -OH and Cl? with Thymine and Uracil
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1974, 70 (07), 1974) Fendler, Janos H.; Infante, A.; Jirathana, Poonsri; Fendler, Eleanor J.
    Micellar surfactants decrease the yield of products formed in the interaction of ea"q, -H, -OH and Cl2 with uracil and thymine far in excess of the decrease expected on the basis of simple competition of these species for the pyrimidines and the surfactants. Additionally, in the presence of micelles percentages of some of the radiolytic products of thymine, particularly the dimers, decrease at the expense of the glycols. Effects on uracil are smaller than those on thymine. These results are explicable in terms of interactions between the product-forming intermediate species with the micelles and the significance of this behaviour is discussed.