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A rapid and sensitive method for the quantitation of microgram quantities of protein
A N A L Y T I C A L BIOCHEMISTRY 72, 248-254 (1976)
A Rapid and Sensitive Method for the Quantitation of
Microgram Quantities of Protein Utilizing the
Principle of Protein-Dye Binding
Reproduction Research Laboratorirs, Department of Biochemistry,
University of Georgia, Athens, Georgia 30602
Received September 1 1 . 1975; accepted January 29. 1976
A protein determination method which involves the binding of Coomassie
Brilliant Blue G-250 to protein is described. The binding of the dye to protein
causes a shift in the absorption maximum of the dye from 365 to 595 nm. and
it is the increase in absorption at 595 nm which is monitored. This assay is
very reproducible and rapid with the dye binding process virtually complete in
approximately 2 min with good color stability for I hr. There is little or no
interference from cations such as sodium or potassium nor from carbohydrates
such as sucrose. A small amount of color is developed in the presence of
strongly alkaline buffering agents, but the assay may be run accurately by the
use of proper buffer controls. The only components found to give excessive
interfering color in the assay are relatively large amounts of detergents such as
sodium dodecyl sulfate, Triton X-100, and commercial glassware detergents.
Interference by small amounts of detergent may be eliminated by the use of
proper controls.
Laboratory practice in protein purification often requires a rapid and
sensitive method for the quantitation of protein. Methods presently
available partially fulfill the requirement for this type of quantitation.
The standard Lowry procedure (1) is subject to interference by com-
pounds such as potassium ion (2), magnesium ion (3), EDTA (4), Tris
(3) thiol reagents (2), and carbohydrates (5). The relatively insensitive
biuret reaction (6) is subject to interference by Tris (7), ammonia (8),
and glycerol (9). Even the modified procedure for eliminating problems
with the Lowry and biuret assays (10,
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