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BradfordUltra

Detergent Compatible Protein Quantitation

BradfordUltra is a quick and ready-to-use Coomassie-binding, colorimetric method for total protein quantitation in an environment containing up to 1% detergent (1% high protein range, 0.1% low protein range)

When Coomassie dye binds protein in an acidic medium, an immediate shift in absorption maximum occurs from 465 nm to 595 nm with a concomitant color change from brown to blue. Protein concentrations are estimated by reference to absorbances obtained for a series of standard protein dilutions, which are assayed alongside the samples with unknown protein concentrations.

Expedeon’s BradfordUltra is an improvement over classical Bradford formulations which cannot tolerate detergent contamination of the protein samples. In addition, the BradfordUltra reagent shows excellent linearity for a defined range of protein concentrations and shows significantly less protein-to-protein variation than is observed with other Bradford-type Coomassie formulations.

Detergent Compatibility

Comparison of Expedeon’s BradfordUltra Assay with Pierce’s Coomassie Protein Assay. The graph shows the average blank corrected A595 measurements for detergents samples (no protein). When detergents are present in the sample, competitor Bradford assay solutions give high blank readings making accurate detection of the protein sample impossible. BradfordUltra is not affected by the detergents compared to Classic formulations and provides excellent signal to noise ratios and accurate determintation of the protein concentration regardless of the detergent presence.

Comparison of Expedeon’s BradfordUltra Assay with Pierce’s “Coomassie Protein Assay”. The graph shows the average blank corrected A595 measurements for detergents.
BradfordUltra is not affected by the detergents compared to Classic formulations which are subject to the high background noise at 595nm in the presence of detergents.
Standard curves obtained with BradfordUltra are unaffected by the presence of detergents. Standard curves obtained with classical Bradford formulation are significantly affected by the presence of detergents resulting in loss of sensitivity and inaccurate results.

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