Bio-Rad Quick Start™ Bradford Protein Assay - Manual (Page 8)

With the Quick Start Bradford protein assay, dye
color development is significantly greater with
BSA than with most other proteins, including
gamma--globulin. Therefore, the BSA standard
would be an appropriate standard if the sample
contains primarily albumin, or if the protein being
assayed gives similar response to the dye. For a
color response that is typical of many proteins,
the gamma--globulin standard is appropriate.
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