The Amplite® Fluorimetric Nitrite Quantification Assay Kit is a highly sensitive and reliable method for measuring nitrite levels in biological samples, including cell culture supernatants and serum. Nitrite is a crucial precursor in the nitrate-nitrite-nitric oxide (NO) pathway, which plays a significant role in vasodilation, immune responses, and cellular signaling. Accurate quantification of nitrite is essential for researchers studying NO metabolism and its implications in various physiological and pathological processes.​ This assay employs a fluorescence-based detection method, wherein nitrite reacts with a developer reagent to produce a fluorescent signal. The fluorescence intensity is directly proportional to the nitrite concentration, allowing for precise quantification using a fluorescence microplate reader. The kit includes optimized reagents for efficient and reproducible results, featuring a simple protocol with minimal hands-on time. Its high compatibility with various biological samples makes it an excellent tool for researchers investigating nitric oxide production and its role in health and disease.