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