Abstract
A sensitive fluorometric assay for the determination of dihydroxyacetone phosphate (DHAP) is reported here. DHAP is reduced to l-glycerol-3-phosphate with NADH-dependent α-glycerophosphate dehydrogenase. DHAP recycling is provided by oxidation reaction catalysed by α-glycerophosphate oxidase to release hydrogen peroxide. The reaction of hydrogen peroxide with Amplex® Red reagent under horseradish peroxidase catalysis leads to the fluorescent product resorufin. The limit of detection of DHAP is estimated at 1pmol which is roughly 2250 fold more sensitive than the usual DHAP assay based on the detection of NADH by spectrophotometry. This assay is ready-to-use for automated medium-throughput screening.
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