For sensitive and high-throughput phosphate determination. Key Features: Reagent very stable. Due to our innovative formulation, no precipitation of reagent occurs. Therefore no filtration of reagent is needed prior to assays, as is often required with other commercial kits. High sensitivity and wide detection range: detection of as little of 20 pmoles of phosphate and useful range between 0.4 µ M and 50 µ M phosphate. Fast and convenient: single reagent "mix-and-measure" assay allows quantitation of free phosphate within 30 minutes. Compatible with routine laboratory and HTS formats: assays can be performed in tubes, cuvettes or microplates, on spectrophotometers and plate readers. Robust and amenable to HTS: Z factors of 0.7 to 0.9 are observed in 96-well plates. Can be readily automated on HTS liquid handling systems Method: OD620nm (malachite green) . Samples: Enzyme reactions with free phosphate releases. Species: All. Procedure: Assay takes 30 min. Kit size: 500 tests. Detection limit: 0.4 µ M.