The Easy Protein Assay Reagent provides a quick and simple method to measure protein concentrations. The assay is based on protein - Coomassie Blue binding and its light absorbance 595 nm. The assay is quick and easy: simply mix the diluted reagent with 1/10 volume of the protein solution and read the light absorbance at 595 nm. Standard clear 96- well plates or cuvettes can be used for absorbance reading.
The Easy Protein Assay Reagent (Catalog number EPA001) includes 100 ml of 5 x reagent. It is for 2500 assays using 96-well plate or 500 assays using 1 ml-cuvette.
PROTOCOL
(1) Diluted 1 ml of the reagent with 4 ml of water.
(2) Mix 200 µl of the diluted reagent with 20 µl of the protein solution for measurement using 96-well plates. For measurements using 1 ml- cuvettes, mix 1 ml of the diluted reagent with 0.1 ml of the protein solution.
(3) Read the light absorbance at 595 nm (A595).
Data Analysis
Plot the A595 and the protein concentration [Protein] to generate the linear standard curve.
A595 = a [Protein] + b
Where the A595values are from experimental data, the a and b values are from the linear fitting between the A595 values and the protein concentrations.
UNKNOWN SAMPLES
Follow the same procedure to measure the A595 values from the unknown samples. Calculate the protein concentrations in the unknown samples using the A595values from the unknown samples and the a and b values from the standard curve.