Naphthol AS-TR Phosphate disodium is a water-soluble dye commonly used as an enzymatic substrate in various biochemical assays to detect alkaline phosphatase activity. Naphthol AS-TR Phosphate disodium has unique chemical properties that allow it to be hydrolyzed by alkaline phosphatase, forming a colored product that can be detected spectrophotometrically. This makes it a useful tool for monitoring enzyme activity in biological samples such as serum or urine.

Providing storage is as stated on the product vial and the vial is kept tightly sealed, the product can be stored for up to 24 months.
Wherever possible, you should prepare and use solutions on the same day. However, if you need to make up stock solutions in advance, we recommend that you store the solution as aliquots in tightly sealed vials at -20°C. Generally, these will be useable for up to one month. Before use, and prior to opening the vial we recommend that you allow your product to equilibrate to room temperature for at least 1 hour.