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Protein assay/ protein concentration

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Given data from a protein assay with Coomassie blue dye solution taken and graphed at ABS @ 595 nm with BSA concentrations (ug/ml); 1000, 500, 250, 125, 62.5, 31.5....etc what might explain why the ABS vs BSA concentration data is linear at the lower BSA concentration and non-linear at higher [BSA]?

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The expert examines protein assays and protein concentration.

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The most likely reason for the non-linearity of the standard curve is the fact that the assay is based on the binding of the dye reagent to the protein (BSA). This binding ...

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