Erben-Russ M, Michel C, Bors W, Saran M
Institut für Strahlenbiologie, GSF München, Neuherberg, F.R.G.
Free Radic Res Commun. 1987;2(4-6):285-8. doi: 10.3109/10715768709065293.
The sulfite radical anion (SO3.-) is the first intermediate in the autoxidation of sulfite to sulfate. Using competition kinetics, its reactivities with the nucleic acid bases and the corresponding nucleosides were investigated. The second order rate constants were found to be rather low, k less than or equal to 1 x 10(6) dm3mol-1s-1 at pH 7. As a competitor, the carotenoid crocin was used, which was found to be bleached very efficiently by SO3.- (k = 1.0 x 10(9) dm3mol-1 s-1).
亚硫酸根阴离子（SO3.-）是亚硫酸盐自氧化为硫酸盐过程中的首个中间体。采用竞争动力学方法，研究了其与核酸碱基及相应核苷的反应活性。发现二级反应速率常数相当低，在pH 7时k≤1×10(6) dm3mol-1s-1。作为竞争剂，使用了类胡萝卜素藏红花素，发现它能被SO3.-非常有效地漂白（k = 1.0×10(9) dm3mol-1 s-1）。
