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The Bradford protein assay (also known as the Coomassie protein assay) was developed by Marion M. Bradford in 1976. It is a quick and accurate spectroscopic analytical procedure used to measure the concentration of protein in a solution. The reaction is dependent on the amino acid composition of the measured proteins.
Protein Extraction & Protein estimation by Bradford method. Theory/Principle: The Bradford dye assay is based on the equilibrium between three forms of Coomassie Blue G dye. Under strongly acid conditions, the dye is most stable as a doubly-protonated red form.
Bradford assays are dye-binding assays for fast and simple protein quantification. The assay is performed at room temperature and no special equipment is required.
The Bradford protein assay is a dye-binding assay based on the differential color change of a dye in response to various concentrations of protein. The dye reagents are commonly purchased from Bio-Rad (Richmond, CA).
An assay originally described by Bradford (1) has become the preferred method for quantifying protein in many laboratories. This technique is simpler, faster, and more sensitive than the Lowry method.
The Bradford method is a quantitative protein assay method, based on the binding of a dye, Coomassie Brilliant Blue, to a protein sample, and comparing this binding to a standard curve generated by the reaction of known amounts of a standard protein, usually BSA.
The Bradford assay is very fast and uses about the same amount of protein as the Lowry assay. It is fairly accurate and samples that are out of range can be retested within minutes. The Bradford is recommended for general use, especially for determining protein content of cell fractions and assesing protein concentrations for gel electrophoresis.
The Bradford protein assay is a time-tested colorimetric assay. When the Bradford reagent (acidified Coomassie Brilliant Blue G-250) binds to proteins, the dye undergoes a color change in the visible spectrum, with the absorbance maximum moving from 470 to 595 nm.
The Quick Start Bradford protein assay is a simple and accurate procedure for determining the concentration of protein in solution. It provides ready-to-use convenience by supplying the dye reagent at 1x concentration and two protein assay standards at seven prediluted concentrations. The prediluted standards are conveniently packaged in
Bio-Rad's Bradford assays provide a simple and accurate method for determining protein concentrations. The binding of the Bradford reagent to proteins results in a color change which is measured with a spectrophotometer or a microplate reader. Choose the kit that meets your needs.
