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Save time with the Quick Start Bradford protein assay and get fast, simple and accurate protein determination. Use the flexible Bio-Rad Bradford protein assay for all your assays from standard to low concentrations. All protein assays are subject to interference by certain substances under some conditions. Additionally, free amino acids and small peptides (<3 kDa) do not interfere with the assay.
For membrane preparations that have been solubilized with detergents, depending on the type of detergent and the concentration, it may be necessary to dilute the sample to reduce the concentration.
Bio-Rad Bradford protein assay kits include either of two different proteins, BSA or BGG, as standards to construct a standard curve for the relative quantitation of the proteins in the samples. If necessary, the accuracy of the standards can be increased by preparing the standard dilutions in the same buffer as the samples. Bio-Rad has a line of protein estimation kits, namely: Bradford Assay, Bio-Rad Protein Assay, DC Assay and RC DC Assay. The RC DC Assay is based on the principle of Lowry estimation, where protein reacts with alkaline copper and subsequently reduces the folin reagent and leads to color development. The RC DC Assay Kit comes with Reagent A (which contains alkaline copper tartarate solution), Reagent B (which contains a dilute folin reagent), Reagent S, RC reagent I, RC reagent II, and either bovine serum albumin (BSA) or bovine gamma globulin. First, 5 ul of Reagent S is added to 250 ul of Reagent A; each tube requires 127 ul of this reagent, which is called A’.
I would happily recommend this kit for all who perform 2DE as well as for anyone whose samples contain interfering, soluble chemicals. Worth buying if you are doing 2DE and working with solutions containing high concentrations of reducing agents, salts and other interfering agents.
If you are an educator at the high school or college level, visit our Education Discount Policy page to establish an education account number.
Use the Quick Start Bradford protein 1x dye reagent for one-step determination of protein concentration.
Many detergents and basic protein buffers interfere with the Bradford assay; interference may be caused by chemical-protein or chemical-dye interactions. Para enviar una copia de este producto, introduzca las direcciones de correo electronico de los destinatarios a continuacion. Copyright for any material contained in this wiki is reserved by the Author(s) or McMaster University, unless otherwise stated or credited. Protein Quantitation Curve Standard curve generated on the SmartSpec Plus spectrophotometer using the Lowry protein assay.


The SmartSpec™ Plus spectrophotometer has a wider range of features and functions than many other benchtop spectrophotometers, offering performance, stability, and functionality at an affordable price. A simple, menu-driven interface simplifies assays and provides answers to common sample computations at the touch of a button. At the end of an assay, a report can be printed that shows the user's identification, date, and results. The SmartSpec Plus spectrophotometer offers a complete solution for the quantitation of PCR products, nucleic acid preparations, or samples to be used in bacterial transfection protocols.
The SmartSpec Plus spectrophotometer also simplifies the quantitation of DNA and RNA oligonucleotides.
The SmartSpec Plus spectrophotometer has preprogrammed methods for quantitating proteins by the Bradford, Lowry, and BCA methods. Measurement of low Volume DNA Samples Using the Hellma TrayCell With the SmartSpec Plus Spectrophotometer, Rev A.
Get the speed, accuracy, and flexibility you need for all your protein determinations - from standard to low concentration, including microplate assays. 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.
One contains ready-to-use reagent and prediluted BSA or BGG standards for a simple and quick Bradford protein assay. The Bradford protein assay is quite robust and is compatible with many compounds commonly found in protein preparations.
If a quick Bradford protein assay kit with a ready-to-use Bradford reagent is used, detergents that interfere will need to be at a lower concentration in the sample than in the standard assay due to the high sample-to-dye ratio. For most determinations of protein concentration, relative values are generally sufficient.
Accurate estimation is necessary for assessing the levels of specific protein for Western blotting which has a sensitivity range from nano to picograms of protein.
The first two kits are based on the Bradford method and the other two are based on the Lowry method of protein estimation.
This color development is basically because of changes to tyrosine and tryptophan and to a lesser extent, cysteine and histidine. Previously, it would take 3?-4 hours to estimate the protein (when we performed TCA precipitation protocol), now it just takes 1-1? hour.
To support this effort, the company has implemented a discount policy that allows high school and college teaching laboratories to purchase kits, instruments, reagents, and other equipment at preferred prices.
Features built into each assay method facilitate data collection and present a complete analysis of assay results.


The absorbance at 595 nm is then read either in a spectrophotometer or a microplate reader and is directly proportional to the amount of protein bound. The other kit provides more flexibility with 5x concentrated reagent and lyophilized BSA or bovine-globulin standards, allowing the user to prepare reagent and standards at any concentration. Dilution may also be required in the presence of flavonoids and some basic buffers, as they can also interfere with Bradford protein assays.
BSA is the most commonly used standard for relative protein concentration determination in most laboratories, although the color response of γ-globulin is usually more representative of true concentration for samples that do not have a high albumin content. The selection of these kits depends on the concentration of specific chemicals in the sample, the availability of filters (for detection) in the lab and the amount of protein available for estimation.
When I started the estimation for the first time, the assay showed an odd result: all the tubes went out of range.
The instrument provides absorbance values, concentration, and purity values so you can proceed confidently with your downstream experiments.
The easy-to-follow menu guides you through the entire assay, ensuring that all standards and replicates are read.
The exact protein concentration of the sample is determined by interpolation from a standard curve made by measuring the absorbance of a dilution series of protein standards of known concentrations within the linear response range of the Bradford protein assay.
These two methods have been modified and kits are available allowing one to select the proper kit for the type of lysis solution (containing interfering agents) or protein solution one has.
Proteins commonly used as standards include bovine serum albumin (BSA) and bovine γ-globulin (BGG).
The DC Assay can be used with detergents, but cannot be used for samples containing reducing agents.
However, the RC DC Assay can be used for samples containing both reducing agents as well as detergents, which are the major interfering agents in protein estimation.
The supernatant is discarded completely (which contains soluble interfering agents) and 127 ul of A’ is added. After incubation at room temperature for 5 minutes, 1 ml of Reagent B is added to each tube.



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