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About This Item
Linear Formula:
C6H4(NH2)2·2HCl
CAS Number:
Molecular Weight:
181.06
Beilstein/REAXYS Number:
3912045
EC Number:
MDL number:
UNSPSC Code:
12352100
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assay
99%
mp
258 °C (dec.) (lit.)
SMILES string
Cl[H].Cl[H].Nc1ccccc1N
InChI
1S/C6H8N2.2ClH/c7-5-3-1-2-4-6(5)8;;/h1-4H,7-8H2;2*1H
InChI key
RIIWUGSYXOBDMC-UHFFFAOYSA-N
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General description
o-Phenylenediamine dihydrochloride (OPD) is a chromogenic substrate that can be used in enzyme-linked immunosorbent assay (ELISA) procedures as it utilizes horseradish peroxidase conjugates. The substrate produces a soluble end product that is orange-brown and can be read spectrophotometrically at 450 nm. The OPD reaction may be stopped with 3N HCl or 3M H2SO4 and read at 492 nm.
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