AIM To develop a rapid and sensitive method of protein quantification assay. METHODS Protein content of bovine serum albumin (BSA) and mice liver homogenate was determinated by microplate colormetric (MPC) in which coomassie brilliant blue (CBB) is used as color reagent. RESULTS Detecting limit of MPC was lower (0.63 μg) than that of macro colormetric (MC). MPC had advantage of rapidity and lesser volume of sample (a few microliter). CONCLUSION MPC is a method of simplicity, rapidity and sensitivity fo...