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A method for solid-phase detection of phospholipase A₂ (PLA₂) was developed. The method uses 1-octanoyloxynaphthalene-3-sulfonic acid, which was found to be a good substrate of PLA₂. The substrate is hydrolyzed by PLA₂ into 1-naphthol-3-sulfonic acid, which is spontaneously coupled with coexisting diazonium salt to form a red-purple azo dye. Streptomyces(More)
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