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Near infrared emission of singlet oxygen generated in the dark

✍ Scribed by Khan, Ahsan U.

Publisher: John Wiley and Sons
Year: 1989
Weight: 588 KB
Volume: 4
Category: Article
ISSN: 0884-3996
DOI: 10.1002/bio.1170040129

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✦ Synopsis

Singlet oxygen generation is reported from (1) enzymatic reaction and (2) electron transfer reactions of the superoxide anion measured directly with an ultrasensitive near-IR emission spectrophotometer by monitoring the Oz('A,) + O2 (32,-) transition at 1268nm. Near-IR emission spectra from the myeloperoxidase and lactoperoxidase enzymatic systems show only emission of singlet oxygen at 1268 nm. The lipoxygenase/Na-linoleate enzymatic reaction exhibits t w o emissions, 1268nm and 1288nm. The latter emission is identified as originating from a peroxy radical. Spectral and kinetic data giving evidence of singlet oxygen generation is obtained from the reaction of potassium superoxide solubilited by 18-crown-6-ether in acetonitrile with a series of organometallic coordination compounds.

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