Hello,

what is the correct molarity of a stop solution for a peroxidase using o-Phenylenediamine dihydrochloride (OPD)? I am getting all sorts of molarities, from fractional up to 3 M according to the website.

From ThermoFisher I got:

"Stop Solution is 0.16M sulfuric acid for use with the ELISA substrate 3,3’,5,5’ - tetramethylbenzidine (TMB)".

Is this the molarity also for OPD?

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