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5-Bromo-4-chloro-3-indolyl phosphate p-toluidine salt

≥95.0% (HPLC)

BCIP p-toluidine salt, X-phosphate p-toluidine salt
Empirical Formula (Hill Notation):
C8H6BrClNO4P · C7H9N
CAS Number:
Molecular Weight:
EC Number:
MDL number:
PubChem Substance ID:


≥95.0% (HPLC)



storage temp.


SMILES string




InChI key


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For the colorimetric detection of alkaline phosphatase-labeled molecules, 5-Bromo-4-chloro-3-indolyl phosphate (BCIP) and Nitro Blue Tetrazolium (NBT) are available. The BCIP/NBT substrate system is versatile and functions in a variety of applications, including Northern Southern, and Western blotting, in situ hybridization, and immunohistochemistry.
BCIP is provided in two salt forms: the disodium salt which is soluble in water and the p-toluidine form which is soluble in dimethylformamide. These salt forms may be used to prepare a stock solution that in combination with NBT and a reaction buffer, form a substrate solution for alkaline phosphatase. This substrate system, when incubated with alkaline phosphatase, produces an insoluble NBT diformazan product that is easily observable with its purple color. For added convenience, a mixture of BCIP and NBT is provided in an easily dissolvable tablet form or as a ready-to-use liquid.


100 mg in poly bottle
1, 5 g in poly bottle


Histochemical substrate for alkaline phosphatase.

Legal Information

BCIP is a registered trademark of Sigma-Aldrich Co. LLC

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

Certificate of Origin

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