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Protein Protocols Protein Protocols

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14 Walker<br />

9. A comparison of the BCA, Lowry and Bradford assays for analyzing gylcosylated and<br />

non-glycosylated proteins have been made (6). Significant differences wee observed<br />

between the assays for non-glycosylated proteins with the BCA assay giving results closest<br />

to those from amino acid analysis. Glycosylated proteins were underestimated by the<br />

Bradford the method and overestimated by the BCA and Lowry methods. The results<br />

suggest a potential interference of protein glycosylation with colorimetric assays.<br />

10. A modification of this assay for analysis complex samples, which involves removing contaminants<br />

from the protein precipitate with 1 M HCl has been reported (7).<br />

References<br />

1. Smith, P. K., Krohn, R. I., Hermanson, G. T., Mallia, A. K., Gartner, F. H., Provenzano,<br />

M. D., Fujimoto, E. K., Goeke, N. M., Olson, B. J., and Klenk, D. C. (1985) Measurement<br />

of protein using bicinchoninic acid. Analyt. Biochem. 150, 76–85.<br />

2. Kessler, R. J. and Fanestil, D. D. (1986) Interference by lipids in the determination of<br />

protein using bicinchoninic acid. Analyt. Biochem. 159, 138–142.<br />

3. Hill, H. D. and Straka, J. G. (1988) <strong>Protein</strong> determination using bicinchoninic acid in the<br />

presence of sulfhydryl reagents. Analyt. Biochem. 170, 203–208.<br />

4. Morton, R. E. and Evans, T. A. (1992) Modification of the BCA protein assay to eliminate<br />

lipid interference in determining lipoprotein protein content. Analyt. Biochem. 204,<br />

332–334.<br />

5. Gates, R. E. (1991) Elimination of interfering substances in the presence of detergent in<br />

the bicinchoninic acid protein assay. Analyt. Biochem. 196, 290–295.<br />

6. Fountoulakis, M., Juranville, J. F., and Manneberg, M. (1992) Comparison of the coomassie<br />

brilliant blue, bicinchoninic acid and lowry quantitation assays, using nonglycosylated and<br />

glycosylated proteins. J. Biochem. Biophys. Meth. 24, 265–274.<br />

7. Schoel, B., Welzel, M., and Kaufmann, S. H. E. (1995) Quantification of protein in dilute<br />

and complex samples–modification of the bicinchoninic acid assay. J. Biochem. Biophys.<br />

Meth. 30, 199–206.

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