P8787
o-Phenylenediamine dihydrochloride
chromogenic, tablet
Synonym(s):
1,2-Phenylenediamine tablet, OPD, OPD Tablet
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About This Item
Linear Formula:
C6H4(NH2)2·2HCl
CAS Number:
Molecular Weight:
181.06
NACRES:
NA.83
PubChem Substance ID:
UNSPSC Code:
12352204
MDL number:
Beilstein/REAXYS Number:
3912045
Product Name
o-Phenylenediamine dihydrochloride, tablet, 4 mg substrate per tablet
InChI
1S/C6H8N2.2ClH/c7-5-3-1-2-4-6(5)8;;/h1-4H,7-8H2;2*1H
SMILES string
Cl[H].Cl[H].Nc1ccccc1N
InChI key
RIIWUGSYXOBDMC-UHFFFAOYSA-N
form
tablet
mp
258 °C (dec.) (lit.)
storage temp.
2-8°C
Quality Level
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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.
Application
o-Phenylenediamine dihydrochloride has been used as a substrate for horseradish-peroxidase-conjugated secondary antibodies in enzyme-linked immunosorbent assay (ELISA).
Preparation Note
Dissolve one tablet in 0.05 M phosphate-citrate buffer, pH 5.0, to the desired concentration (typically an OPD concentration of 0.4 mg/ml is used). Add 40 μl of fresh 30% hydrogen peroxide per 100 ml of substrate buffer solution, immediately prior to use. Tablets are individually packaged in foil packets.
signalword
Warning
hcodes
Hazard Classifications
Aquatic Chronic 2 - Carc. 2 - Muta. 2 - Skin Sens. 1
Storage Class
11 - Combustible Solids
wgk
WGK 3
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