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- W2410927532 abstract "The methylene blue-sensitized photooxidation of adrenochrome was studied by steady-state kinetics. The buffered, aqueous system was irradiated with light longer than 600 nm, wavelengths at which only the sensitizer absorbs. During irradiation, disappearance of adrenochrome and the formation of adrenochrome-melanin was observed. Calculated rate constants were determined on the basis of spectroscopic measurements. It was found that the observed transformation reaction steps are pH dependent. The participation of two types of photosensitized mechanism has been evidenced. Type II, singlet oxygen mechanism, predominates at pH below 9, whereas above pH 9, Type I applies. We observed the so-called isotope effect and a decrease of photooxidation rate in the presence of azide ion, a well-known singlet oxygen quencher, indicating the participation of singlet oxygen." @default.
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- W2410927532 date "1991-01-01" @default.
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- W2410927532 title "Photosensitized transformation of adrenochrome." @default.
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