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Phosphatase, Alkaline from Escherichia coli

buffered aqueous glycerol solution, 20-50 units/mg protein (in glycine buffer)

Orthophosphoric-monoester phosphohydrolase (alkaline optimum)
CAS Number:
Enzyme Commission number:
EC Number:
MDL number:

biological source

Escherichia coli

Quality Level


buffered aqueous glycerol solution

specific activity

20-50 units/mg protein (in glycine buffer)

foreign activity

DNase, RNase, none detected

storage temp.


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Alkaline phosphatase is used for conjugation to antibodies and other proteins for ELISA, Western blotting, and histochemical detection. It may be used for protein labeling when high sensitivity is required. Product P4069 is provided as a buffered aqueous glycerol solution.
Phosphatase, Alkaline from Escherichia coli has been used:
  • in fluorometric assay to determine its enzyme activity
  • in the dephosphorylating enzyme cocktail for dephosphorylation of peptides
  • in treating the nerve and HL60 cell lysate for β-hydroxy β-methylglutaryl-Coenzyme A (HMG-CoA) reductase activity

Biochem/physiol Actions

Alkaline phosphatase is a model enzyme for understanding phosphomonoesterase. It is used in various biochemical methods and enzyme linked immunosorbent assay (ELISA).
Alkaline phosphatase, from Escherichia coli, is a dimeric, non-glycosylated protein which mainly reside in the periplasmic space. Three known isoforms exist. The enzyme requires zinc, and is activated by magnesium. E. coli akaline phosphatase has a broad specificity for phosphate esters.


Alkaline phosphatase in 5 mM EDTA, pH 8, will be irreversibly heat inactivated at 75°C for 10 minutes.

Unit Definition

One unit will hydrolyze 1.0 μmole of p-nitrophenyl phosphate per min at pH 10.4 at 37 °C.

Physical form

Solution in 5 mM Tris-HCl, pH 7.4, 0.5 mM MgCl2, 0.5 mM ZnCl2, 50% (w/v) glycerol

Analysis Note

Protein determined by biuret.

Storage Class Code

13 - Non Combustible Solids



Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Certificate of Analysis

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Certificate of Origin

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