B-Pak, is a straightforward and rapid procedure for determining the concentration of protein in solution. Thanks to an optimized Bradford reagent formulation, B-Pak gives precise determination of protein concentration even in the presence of detergent, allowing the use of this kit for transfection experiments. In addition, this kit can be used for all protein concentration measurement due to a superior linearity of response: from 0.5 to 1500µg / mL of protein. Ready-to-use and provided with detailed protocols, this kit does not require dilution, filtration or calculations: assay is processed in a few minutes. Convenient packaging of components answers to scientists needs in order to save space storage and time. With a low cost per assay (3 cents per sample in microassays), B-Pak is the most economical kit in this field.