Hi everyone,

After going through various questions and comments here on ResearchGate about issues with low absorbance in the cell-free Griess assay (using sodium nitroprusside), I want to share the conditions we’ve used in our lab (see the attached file) to achieve the highest absorbance for the positive control (SNP + buffer).

Here are the common details:

  • All samples were incubated for 60 minutes.
  • The Griess reagent was freshly prepared as a 1:1 mixture of:

-2% (w/v) sulfanilamide in 5% (v/v) H₃PO₄ (prepared in distilled water) -0.1% (w/v) NED in distilled water

Best regards,

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