BCA-Protein-Quantification: Time Drive?

Christoph Peter deleteme_cpeter at zedat.fu-berlin.de
Fri Aug 7 03:03:24 EST 1998

Hi all!

I use the bicinchoninic-acid-assay in a 96well format to
determine/estimate protein concentrations. I always have a
standard-dilution-row on every plate.

When I tried to determine the concentration of a simple yeast-extract,
I noted the following:

- the slope of the calibration-line (mg as a function of A550)
decreases with time (15min to 3hrs)

- the concentration of my extract also decreases with time!!!!
(calculated with corresponding slope!)

As the assay is designed to be read after 30min and 30degrees C - when
do I get the _correct_ concentration?????????????????


Christoph Peter
PhD Student (Biotechnology)
cpeter at zedat dot fu-berlin dot de

>Alles wird gut!<(Beate)

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