Published September 1983
| Version v1
Journal article
Free radical mechanisms for the oxidation of substituted ascorbates. A pulse radiolysis study of L-ascorbic acid-2-sulfate
Description
The oxidations of L-ascorbate 2-sulfate by Br2- and OH radicals generated in aqueous solutions (pH 4.5 to 9.5) were studied by pulse radiolysis. The (2-SO4A).- radical, generated in an electron transfer reaction between Br2- and the parent compound, loses sulfate (tau approx. 500 μsec) to give ascorbate free radical (A.-) with a G(A.-) = 2.0. The oxidation of L-ascorbate 2sulfate by OH radicals is complex, yielding both (2-SO4A)- and OH radical adducts. Some of these transients subsequently yield A.-. HPLC studies corroborate the overall mechanism postulated for the oxidation of L-ascorbate 2-sulfate by OH radicals
Additional details
Publishing Information
- Journal Title
- Radiat. Res.
- Journal Volume
- 95
- Journal Issue
- 3
- Series
- Radiat. Res.
- Journal Page Range
- 530-540
- ISSN
- 0033-7587
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 15020620
- Subject category
- S38: RADIATION CHEMISTRY, RADIOCHEMISTRY AND NUCLEAR CHEMISTRY;
- Descriptors DEI
- ABSORPTION SPECTRA; AQUEOUS SOLUTIONS; ASCORBIC ACID; BROMINE; HYDROXYL RADICALS; OXIDATION; PH VALUE; RADIOLYSIS; SULFATES
- Descriptors DEC
- CHEMICAL RADIATION EFFECTS; CHEMICAL REACTIONS; DECOMPOSITION; DISPERSIONS; ELEMENTS; HALOGENS; HOMOGENEOUS MIXTURES; MIXTURES; NONMETALS; OXYGEN COMPOUNDS; RADIATION EFFECTS; RADICALS; SOLUTIONS; SPECTRA; SULFUR COMPOUNDS; VITAMINS