Radiolysis study of the alloxan-dialuric acid couple. I. The reduction of alloxan by e/sub aq//sup -/ and COO/sup -/ radicals
Journal Article
·
· Radiat. Res.; (United States)
Reduction of alloxan (A) to dialuric acid (AH/sub 2/) by e/sub aq//sup -/ and COO/sup -/ has been studied by ..gamma.. and pulse radiolysis. By ..gamma.. radiolysis, the G-value for dialuric acid formation is equal to G(AH/sub 2/) = 4.7 +- 0.25 eq/100 eV = G/sub H/ + G/sub e//sub aq//sup -/ +G/sub OH/ - 2G/sub H/sub 2/O/, dialuric acid being oxidized by H/sub 2/O/sub 2/. Pulse radiolysis gives evidence for an intermediate AH formation which should be of a semiquinone type, and whose absorption spectrum has been characterized. Its production rate constants by reactions of e/sub aq//sup -/ and COO/sup -/ with alloxan were measured: k(e/sub aq//sup -/ + A) = (1.7 +- 0.02) x 10/sup 10/ M/sup -1/ sec/sup -1/; k(COO/sup -/ + A) = (3.7 +- 1.1) x 10/sup 7/ M/sup -1/ sec/sup -1/. AH disappears by disproportionation with a rate constant 2k = (1.6 +- 0.03) x 10/sup 8/ M/sup -1/ sec/sup -1/.
- Research Organization:
- Univ., Paris, France
- OSTI ID:
- 6903902
- Journal Information:
- Radiat. Res.; (United States), Journal Name: Radiat. Res.; (United States) Vol. 83:2; ISSN RAREA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
560111 -- Radiation Effects on Biochemicals-- In Vitro-- (-1987)
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ABSORPTION SPECTRA
ALLOXAN
AZINES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
DATA
DECOMPOSITION
DOSES
ELECTROMAGNETIC RADIATION
ELECTRON TRANSFER
EXPERIMENTAL DATA
GAMMA RADIATION
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
HYDROGEN PEROXIDE
INFORMATION
IONIZING RADIATIONS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXYGEN COMPOUNDS
PEROXIDES
PULSE TECHNIQUES
PYRIMIDINES
RADIATION CHEMISTRY
RADIATION DOSES
RADIATION EFFECTS
RADIATIONS
RADIOLYSIS
REACTION INTERMEDIATES
REDUCTION
SPECTRA
400600* -- Radiation Chemistry
560111 -- Radiation Effects on Biochemicals-- In Vitro-- (-1987)
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ABSORPTION SPECTRA
ALLOXAN
AZINES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
DATA
DECOMPOSITION
DOSES
ELECTROMAGNETIC RADIATION
ELECTRON TRANSFER
EXPERIMENTAL DATA
GAMMA RADIATION
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
HYDROGEN PEROXIDE
INFORMATION
IONIZING RADIATIONS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXYGEN COMPOUNDS
PEROXIDES
PULSE TECHNIQUES
PYRIMIDINES
RADIATION CHEMISTRY
RADIATION DOSES
RADIATION EFFECTS
RADIATIONS
RADIOLYSIS
REACTION INTERMEDIATES
REDUCTION
SPECTRA