The __________ method is commonly used for measuring protein concentration in solutions and is based on the reaction of proteins with the Folin-Ciocalteu reagent.

The Lowry method is commonly used for measuring protein concentration in solutions and is based on the reaction of proteins with the Folin‑Ciocalteu reagent. In this assay, proteins reduce the reagent, producing a blue color that is measured at 750 nm. The intensity of the blue color is proportional to the protein amount, so a standard curve with known protein concentrations is used for quantification. For example, if a sample yields a color intensity that matches a 1 mg/mL standard, the sample is determined to contain 1 mg/mL of protein. This method is popular because it is relatively sensitive and can be used with many different protein types.