o-Phenylenediamine is a peroxidase substrate suitable for use in ELISA procedures. The substrate produces a soluble end product that is orange-brown in color and can be read spectrophotometrically at 450 nm. The OPD reaction may be stopped with 3 N HCl or 3 M H2SO4 and read at 492 nm.
J H Bovaird; T T Ngo; H M Lenhoff. Optimizing the o-phenylenediamine assay for horseradish peroxidase: effects of phosphate and pH, substrate and enzyme concentrations, and stopping reagents. Clinical Chemistry.1982, 28 (12), 2423-2426.
G Wolters; L Kuijpers; J Kacaki; A Schuurs.Solid-phase enzyme-immunoassay for detection of hepatitis B surface antigen. Journal of Clinical Pathology. 1976, 29 (10), 873-879.
Hazard Statements: H301-H312-H332-H319-H317-H341-H351
Toxic if swallowed. Harmful in contact with skin. Harmful if inhaled. Causes serious eye irritation. May cause an allergic skin reaction. Suspected of causing genetic defects. Suspected of causing cancer.
Precautionary Statements: P201-P261-P301+P310a-P305+P351+P338-P405-P501a
Obtain special instructions before use. Avoid breathing dust/fume/gas/mist/vapours/spray. IF SWALLOWED: Immediately call a POISON CENTER/doctor IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. Store locked up. Dispose of contents/container in accordance with local/regional/national/international regulations.