3. While the binding of Coomassie blue to proteins can lead to accurate measurements of protein concentration, there are situations where the absorbance values could be misleading. For example, detergents are often used in the purification of proteins. Certain detergents mixed in with the dye could lead to incorrect determinations of protein concentration. Take a look at the spectrum of the detergent polysorbate 80, above. If you had used this detergent to purify the protein in part c above, would you expect it to interfere with your concentration calculations? Why or why not?

Biochemistry
9th Edition
ISBN:9781305961135
Author:Mary K. Campbell, Shawn O. Farrell, Owen M. McDougal
Publisher:Mary K. Campbell, Shawn O. Farrell, Owen M. McDougal
Chapter5: Protein Purification And Characterization Techniques
Section: Chapter Questions
Problem 28RE: REFLECT AND APPLY An amino acid mixture consisting of phenylalanine, glycine, and glutamic acid is...
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3
Acra
Alrich
TOI
NOF
200
250
300
350
Wavelength (nm)
UV/Vis spectrum of four brands of polysorbate 80, a common detergent used in protein purification. From
Wuelfin, et al., "Polysorbate 80 UV/vis spectral and chromatographic characteristics-defining boundary
conditions for use of the surfactant in dissolution analysis."
3. While the binding of Coomassie blue to proteins can lead to accurate measurements of
protein concentration, there are situations where the absorbance values could be misleading.
For example, detergents are often used in the purification of proteins. Certain detergents mixed
in with the dye could lead to incorrect determinations of protein concentration. Take a look at
the spectrum of the detergent polysorbate 80, above. If you had used this detergent to purify
the protein in part c above, would you expect it to interfere with your concentration
calculations? Why or why not?
Absorbance (AU)
Transcribed Image Text:3 Acra Alrich TOI NOF 200 250 300 350 Wavelength (nm) UV/Vis spectrum of four brands of polysorbate 80, a common detergent used in protein purification. From Wuelfin, et al., "Polysorbate 80 UV/vis spectral and chromatographic characteristics-defining boundary conditions for use of the surfactant in dissolution analysis." 3. While the binding of Coomassie blue to proteins can lead to accurate measurements of protein concentration, there are situations where the absorbance values could be misleading. For example, detergents are often used in the purification of proteins. Certain detergents mixed in with the dye could lead to incorrect determinations of protein concentration. Take a look at the spectrum of the detergent polysorbate 80, above. If you had used this detergent to purify the protein in part c above, would you expect it to interfere with your concentration calculations? Why or why not? Absorbance (AU)
Expert Solution
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Proteins absorb strongly at 280 nm due to the presence of aromatic amino acids (Phenyl alanine, tyrosine and tryptophan). The peptide bonds found in the amino acids also can absorb at 205 nm. The quantitation of the proteins by absorbance assay is usually performed by measuring the absorbance at 280 nm. 

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