Abstract
This paper reports the photoinduced chemiluminescence (PCL) of a methyl cypridina luciferin analogue (MCLA) in a flow injection system using phthalocyanine derivatives as photosensitizers. The photoexcited phthalocyanine produces singlet molecular oxygen (1O2) in air-saturated solutions. Subsequently 1O2 reacts with MCLA to initiate chemiluminescence. The MCLA-dependent chemiluminescence method would thus potentially provide an easy way for determination of 1O2. Under the optimum conditions, the increase in PCL intensity was proportional to the MCLA concentration ranging from 0.1 to 1.0 µM. The assay was sensitive and reproducible (the relative standard deviation was 6.3%, n = 10). The method has successfully been applied to compare the ability of 1O2 generation of tetra(potassium) salt and tetra(tetrabutylammonium) salt of tetra sulfonated phthalocyanine zinc, which have similar structures and spectra.
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