Allen J M, Engenolf S, Allen S K
Department of Chemistry, Indiana State University, Terre Haute 47809, USA.
Biochem Biophys Res Commun. 1995 Jul 26;212(3):1145-51. doi: 10.1006/bbrc.1995.2088.
The reaction of singlet molecular oxygen (1O2) with p-aminobenzoic acid (PABA) is quite rapid. The rate constant for reaction of 1O2 with PABA was measured in buffered aqueous solution by the method of competition kinetics and found to be 8.9 x 10(8) M-1 sec-1. The results of a Stern-Volmer analysis indicate that additional loss of 1O2 does not occur through physical quenching by PABA. Although illuminated PABA solutions are known to form 1O2, it appears that PABA is also a very efficient sink for 1O2.
单线态分子氧（1O2）与对氨基苯甲酸（PABA）的反应相当迅速。采用竞争动力学方法在缓冲水溶液中测定了1O2与PABA反应的速率常数，结果为8.9×10(8) M-1秒-1。斯特恩-沃尔默分析结果表明，PABA不会通过物理猝灭导致1O2额外损失。虽然已知光照下的PABA溶液会生成1O2，但PABA似乎也是1O2的一个非常有效的消耗剂。
