Protein w/ no Trp quantitation: help!!!

R. Bryan Sutton sutton at
Sat Feb 17 01:32:51 EST 1996

You can try the BCA assay from Pierce.  However, since both Tris and DTT 
are contraindicated for this assay, you can TCA/deoxycholate precipitate 
the protein first. This works very well for me.  It correlates amazingly 
well with both Bradford assay and A280 estimates.  It's also about 10% 
from the value of an amino acid analysis (if you consider that method 

Bryan Sutton
University of Texas Southwestern Medical Center
email: sutton at

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