Abstract
The oxygen consumption, vis-a-vis 1 O 2 production during irradiation of dyes such as rose bengal, merocyanine-540, and aluminum phthalocyaninetetrasulfonate, in the presence of salicylic acid was measured by electron spin resonance (ESR) oximetry. Concomitantly, formation of 2,5-dihydroxybenzoic acid (2,5-DHBA) in the same sample waS analyzed by HPLC-EC. Both O 2 consumption and 2,5-DHBA formation were stimulated by D 2 O, quenched by azide, unaffected in the presence of catalase, superoxide dismutase, and hydroxyl radical scavengers (ethanol, formate, etc.), and vastly diminished under N 2
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