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- W2080851965 abstract "Polarographic and oscillopolarographic investigation of the effects of ő≥-radiation on an aqueous solution of alloxantin showed the formation of alloxan, parabanic acid and oxaluric acid. In addition an unidentified product X was observed, exhibiting cathodic wave at E 1 2 ‚Čą-1 V on polarography in acetate buffer of pH 3ŠĻ°6. This product is due probably to a higher oxidation state of alloxan and undergoes polarographic reduction at more negative potentials than parabanic acid. Whereas the conversion of alloxan to parabanic acid via alloxanic acid is unlike our case, since the pH of irradiated aqueous solution of alloxantin is substantially < 7, product X is considered as an intermediate of the radiation-induced oxidation of alloxan to parabanic acid. E.S.R. signals have been observed in ő≥-irradiated polycrystalline alloxantin-dihydrate, alloxan-monohydrate, dialuric acid and parabanic acid. The G -values for the formation of the radicals responsible for these signals have been determined. Signals were also observed from organic free radicals formed through the reactions of electrons induced in irradiated H 2 SO 4 ices containing alloxantin and alloxan. L'investigation polarographique et oscillopolarographique des effets de l'irradiation gamma sur les solutions aqueuses d'alloxantine a montr√© la formation d'alloxane, d'acide parabanique et d'acide oxalurique. En outre on a observ√© la formation d'un produit non identifi√© X produisant une onde cathodique √† E 1 2 ‚Čą-1 V au cours de la polarographie en tampon d'ac√©tate √† pH 3,6. Ce produit correspond probablement √† un degr√© d'oxydation plus √©lev√© d'alloxane et est soumis √† la r√©duction polarographique √† des potentiels plus n√©gatifs que l'acide parabanique. Puisqu'une conversion d'alloxane en acide parabanique en passant par l'acide alloxanique est invraisemblable dans notre cas car le pH des solutions aqueuses irradi√©es d'alloxantine est d'environ 7, le produit X est consid√©r√© comme un interm√©diaire de l'oxydation d'alloxane en acide parabanique, induite par l'irradiation. On a observ√© des signaux de R.P.E. dans le dihydrate polycristallin d'alloxantine, le monohydrate d'alloxane, l'acide dialurique et l'acide parabanique irradi√©s par le rayonnement gamma, et d√©termin√© les valeurs de G pour la formation des radicaux responsables de ces signaux. On a aussi observ√© des signaux de radicaux libres organiques form√©s par r√©action des √©lectrons dans les glaces de H 2 SO 4 irradi√©es et contenant de l'alloxantine et de l'alloxane. –üo–Ľ—Źpo–≥pa—Ą–ł…•ec–ļoe –ł oc—Ü–ł–Ľ–Ľo–Ņo–Ľ—Źpo–≥pa—Ą–ł…•ec–ļoe –łcc–Ľ;e–īoba–Ĺ–łe –īe–Ļc—āb–ł—Ź –≥a–ľ–ľa o–Ī–Ľy…•e–Ĺ–ł—Ź –Ĺa bo–ī–Ĺ—če pac—ā–Ĺop—č a–Ľ–Ľo–ļca–Ĺ—ā–Ĺa –Ņo–ļa–∑oba–Ņo –Īpa–∑oba–Ĺ–łe a–Ľ–Ľo–ļca–Ĺa, –łapa–Īa–Ĺobo–Ļ –ł o–ļca–Ľypobo–Ļ –ļ–łc–Ľo—ā. –öpo–ľe —āo–≥o –Ĺa–Ī–Ľ—é–īa–Ľ–ł o–Īpa–∑oba–Ĺ–łe –Ĺe–ł–īe–Ĺ—ā–ł—Ą–ł—Ü–łpoba–Ĺ–Ĺo–≥o –Ņpo–īy–ļ—āa X , –ļo—āop—č–Ļ –īaba–Ľ –ļa—āo–ī–ł…•ec–ļy—é bo–Ľ–Ĺy –Ņp–ł E 1 2 o–ļo–Ľo -1 bo–Ľ—Ć—āa –Ņp–ł –Ņo–Ľ—Źpo–≥pa—Ą–łpoba–Ĺ–ł–ł b a—Üe—āa—ā–Ĺo–ľ –Īy—Ąep–Ĺo–ľ pac—ābope pH 3,6. –≠—āo—ā –Ņpo–īy–ļ—ā bepo—Ź—ā–Ĺo –Ņp–ł–Ĺa–ī–Ľe–∂–ł—ā –Īo–łee b–łee b—čco–ļo–≥ c—āe–Ņe–Ĺ–ł o–ļ–łc–Ľe–Ĺ–ł—Ź a–Ľ–Ľo–ļca–Ĺa –ł –Ņo–ībep–≥ae—āc—Ź –Ņo–Ľ—Źpo–≥ ae—āc—Ź –Ņo–Ľ—Źpo–≥pa—Ą–ł…•ec–ļo–Ļ pe–īy–ļ—Ü–ł–ł –Ņp–ł –Ņp–ł –Ņo—āe–Ĺ—Ü;–ła–Ľa—á –Īo–Ľee –Ĺe–≥a—ā–łb–Ĺ—č—á …•e–ľ –Ņapa–Īa–Ĺoba—Ź –ļ–łc–Ľ—āa. b —āo bpe–ľ —Ź –ļa–ļ –ļo–Ĺbepc–ł—Ź a–ł–ło–ļca–Ĺa –Ĺa –Ņapa–Īa–Ĺo- by—é –ļ–łc–Ľo—āy …•epe–∑ a–Ľ–Ľo–ļca–Ĺoby—é –ļ–łc–Ľo—āy –≤ –Ĺa—Če–ľ c–Ľ…• ae –Ĺe —Źb–Ľ—Źe—āc—Ź bepo—Ź—ā–Ĺo–Ļ, —āa–ļ –ļa–ļ pH o–Ī–Ľy…•e–Ĺ–Ĺo–≥o bo–ī–Ĺo–≥o pac—ābopa a–Ľ–Ľo–ļca–Ĺ—ā–ł–Ĺa cy—Čec—ābe–Ĺ–Ĺo < 7, –Ņpo–īy–ļ—ā X c…•–ł—āa—é—ā –Ņpo–ľe—Čy- —āo…•–Ĺ—č–ľ –Ņpo–īy–ļ—āo–ľ pa–ī–ła—Ü–łpoba–Ĺ–Ĺo–≥o o–ļ–łc–Ľe–Ĺ–ł—Ź a–Ľl cy;o–ļca–Ĺa –Ĺa –Ņapa–Īa–Ĺoby—é –ļ–łc–Ľo—āy. E.C.P. c–ł–≥–Ĺa–Ľ—č –Ĺa–Ī–Ľ—é–īa–Ľ–łc—Ć b –≥a–ľ–ľa o–Ī–ły…•e–Ĺo–ľ –Ņo–Ľ–ł–ļ p–łc—āa–Ľ–Ľ–ł…•ec–ļo–ľ a–Ľ–Ľo–ļca–Ĺ—ā–ł–Ĺ- –ī–ł–≥–ł–īpa–≥e, a–Ľ–Ľo–ļca–Ĺ - –ľo–Ĺo–≥–ł–īpa–īe, –ī–ła–Ľypobo–Ļ –ļ–łc–Ľo—ā e –ł –Ņapa–Īa–Ĺobo–Ļ –ļ–łc–Ľo—āe. O–Ņpe–īe–Ľe–Ĺ—č –∑–Ĺa…•e–Ĺ–ł—Ź –≥ –ī–Ľ—Ź o–Īpa–∑o–Īa–Ĺ–ł—Ź pa–ī–ł–ļa–Ľob –∑a —ć—ā–ł; c–ł–≥–Ĺa–ł—č. Ha–Ī–Ľ—é–īa–Ľ–łc—Ć —āa–ļ–∂e c–ł–≥–Ĺa–Ľ—č op–≥a–Ĺ…•ec–ļ–ł—á cbo–Īo–ī–Ĺ—č—á pa–ī–ł–ļa–Ľob, –ļo—āop—č e bo–∑–Ĺ–ł–ļa–Ľ–ł pea–ļ—Ü–łe–Ļ —ć–Ľe–ļ—āpo–Ĺob b o–Ī–Ľy…•e–Ĺ–Ĺ—é—á H 2 SO 4 -c—āe–ļ–Ľa—á co–īep–∂a—Č–ł—á a–ł–ło–ļca–Ĺ—ā–ł;–Ĺ –ł a–Ľ–Ľo–ļca–Ĺ. Polarographische und oszillopolarographische Untersuchung der Einwirkung einer gamma-Bestrahlung auf w√§ssrige L√∂sungen von Alloxantin hat die Bildung von Alloxan, Parabans√§ure und Oxalurs√§ure aufgewiesen. Ausserdem wurde ein nicht identifiziertes Produkt beobachtet, welches beim Polarographieren in Azetatpuffer von pH 3,6 eine kathodische Stufe bei E 1 2 ‚Čą -1 V liefert. Dieses Produkt X entspricht wahrscheinlich einer h√∂heren Oxydationstufe des Alloxans und wird polarographisch bei negativeren Potenzialen als die Parabans√§ure reduziert. Da die Umwandlung des Alloxans in Parabans√§ure √ľber Alloxans√§ure in unserem Falle unwahrscheinlich ist, da das pH der bestrahlten w√§ssrigen L√∂sungen von Alloxantin bei 7 liegt, wird das Produkt X als ein Zwischenprodukt der durch Bestrahlung eingeleiteten Oxydation des Alloxans zur Parabans√§ure betrachtet. In gamma-bestrahlten polykrystallinischen Alloxantin-Dihydrat, Alloxan-Monohydrat, Dialurs√§ure, und Parabans√§ure wurden E.S.R. Signale beobachtet, und die G -Werte f√ľr die Bildung der f√ľr diese Signale verantwortlichen Radikale bestimmt. In bestrahtlem H 2 SO 4 -Eis enthalten Alloxantin und Alloxan wurden auch Signale von organischen freien Radiakle beobachtet, die durch Reaktionen von durch die Bestrahlung freigesetzten Elektronen gebildet wurden." @default.
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- W2080851965 title "Some effects of γ-radiation on alloxantin: polarographic, oscillopolarographic and electron spin resonance studies" @default.
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