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Abstract

The storage stability of peroxidase-reactive luminescent cocktails which employ chemiluminescent 2,3-dihydro-1,4-phthalazinediones, oxidants reactant therewith to cause light emission in peroxidase-mediated luminescent reactions, and phenolic sensitivity enhancers is improved by maintaining the pH of the cocktail prior to use at a value in the range of about 3 to about 6 and preferably at a pH of about 5. An analyte sample may be subjected to a reaction resulting in a peroxidase-containing phase, the peroxidase content of which is related to the quantity of analyte in the sample, and the peroxidase phase may then be combined with the thus-described cocktail and an aqueous alkaline organic buffer to raise the pH of the resulting reaction mixture to a value in the range of 7-9, favoring light emission.

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