Determination of sulfite radical (SO 3 ? ?) reaction rate constants by means of competition kinetics
- 1 December 1987
- journal article
- research article
- Published by Springer Nature in Radiation and Environmental Biophysics
- Vol. 26 (4) , 289-294
- https://doi.org/10.1007/bf01221974
Abstract
The sulfite radical anion (SO 3 ⋅ −) was found to react rapidly with the flavonoid quercetin (k = 2.5 × 108 dm3mol−1 s−1) and the carotenoids crocin (k = 1.0 × 109 dm3mol−1 s1−) and crocetin (k = 1.5 × 109 dm3mol1− s1−). The reactions can easily be monitored due to the strong absorptions of the substrates and, in the case of quercetin, the formation of a strongly absorbing transient species. Using these substances, we determined by means of competition kinetics rate constants of SO 3 ⋅ − reactions with nucleic acid components, polyunsaturated fatty acids, and glutathione.Keywords
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