5-Bromo-4-chloro-3-indolyl phosphate

BCIP
Names
	Preferred IUPAC name 5-Bromo-4-chloro-1H-indol-3-yl dihydrogen phosphate
	Other names BCIP
Identifiers
CAS Number	38404-93-2 ;
3D model (JSmol)	Interactive image;
ChemSpider	58873 ;
PubChem CID	65409;
UNII	BZ64NZV99J ;
CompTox Dashboard (EPA)	DTXSID40191744 ;
	InChI InChI=1S/C8H6BrClNO4P/c9-4-1-2-5-7(8(4)10)6(3-11-5)15-16(12,13)14/h1-3,11H,(H2,12,13,14) Key: QRXMUCSWCMTJGU-UHFFFAOYSA-N ; InChI=1/C8H6BrClNO4P/c9-4-1-2-5-7(8(4)10)6(3-11-5)15-16(12,13)14/h1-3,11H,(H2,12,13,14) Key: QRXMUCSWCMTJGU-UHFFFAOYAN;
	SMILES C1=CC(=C(C2=C1NC=C2OP(=O)(O)O)Cl)Br;
Properties
Chemical formula	C8H6BrClNO4P
Molar mass	326.47 g·mol−1
Appearance	Colorless
Solubility in water	soluble in water (sodium salt)
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

5-Bromo-4-chloro-3-indolyl phosphate (BCIP, X-phosphate, XP) is an artificial chromogenic substrate used for the sensitive colorimetric detection of alkaline phosphatase activity. It is, for example, used in immunoblotting, in situ hybridization, and immunohistochemistry, often in combination with nitro blue tetrazolium chloride (NBT).^[1]^[2] 5-bromo-4-chloro-3-indoxyl is oxidized by atmospheric oxygen to form the blue dye 5,5′-dibromo-4,4′-dichloro-indigo. It is also oxidized by nitroblue tetrazolium (NBT), which forms an insoluble dark blue diformazan precipitate after reduction. Alkaline phosphatase is commonly conjugated to secondary antibodies.

References

^ "5-Bromo-4-chloro-3-indolyl phosphate disodium salt". Millipore Sigma.
^ Alkaline phosphatase hydrolyses BCIP to 5-bromo-4-chloro-3-indoxyl<JP Horwitz J. Med. Chem., 1966, 9 (3), pp 447–447 and inorganic phosphate

[1] "5-Bromo-4-chloro-3-indolyl phosphate disodium salt". Millipore Sigma.

[2] Alkaline phosphatase hydrolyses BCIP to 5-bromo-4-chloro-3-indoxyl<JP Horwitz J. Med. Chem., 1966, 9 (3), pp 447–447 and inorganic phosphate

[1]

[2]