product line BioReagent assay ≥97% form powder solubility H2O: soluble100 mg/mL suitability suitable for cell culture storage temp. −20°C Application Chromogenic substrate for the determination of acid and alkaline phosphatases.1,2 The reaction produces a soluble end product that is yellow in color. The reaction may be stopped with 3 N NaOH and read at 405 nm.