For quantitative determination of free and total sialic acid (NANA) and evaluation of drug effects on its metabolism. Key Features: Sensitive and accurate. Use as little as 10 µ L samples. Linear detection range in 96-well plate: 0.02 to 1 mM sialic acid for colorimetric assays and 2 to 100 µ M for fluorimetric assays. Simple and convenient. Can detect free sialic acid by addition of a single working reagent and incubation for 60 min at room temperature or total sialic acid by pre-treating samples with a 60 min hydrolysis step. Method: OD570nm, or FL530/585nm. Samples: Biological. Species: All. Procedure: Assay takes 2 hrs. Kit size: 100 tests. Detection limit: OD, FL: 20, 2 µ M.