Prior to being assayed, this enzyme is reconstituted at a concentration of 1 mg/ml in cold 200 mM Tris-HCl buffer containing 294 mM Potassium Chloride, 0.54 mM Riboflavin 5'-monophosphate, and 0.025% (w/v) BSA, pH 7.5.
(Detailed information could be found in the enzymatic assay(link below):
https://www.sigmaaldrich.com/content/dam/sigma-aldrich/docs/Sigma/Enzyme_Assay/diaphorase.pdf)