For quantitative determination of L-arginine in food, beverage, biological samples (e.g. serum, cell lysate, etc) . Simple. Using our internal standard method and robust reagents, no sophisticated sample pretreatment is required. Sensitive and accurate. Use as little as 10 µ L samples. Linear detection range in 96-well plate: 0.066 to 3 mM for colorimetric assays. High-throughput. Can be readily automated to assay thousands of samples per day. Method: OD450nm; Samples: Food, beverage, and biological samples (e.g. serum, cell lysate, etc) ; Procedures: 90 min