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• W2024574064 abstract "The fluorescence parameters, lifetime, relative quantum yield, maximum and mean wavelength, half-width, and polarization, of bovine serum albumin (BSA) were measured at 15°C in aqueous solutions containing varying concentrations of different chemical perturbants, glycerol, Cu2+ ions, guanidine hydrochloride, and urea. By considering a quenching mechanism as being either dynamic or static, depending upon whether the quenching is or is not accompanied by a change in the fluorescence lifetime, we were able to correlate the changes produced in the various fluorescence parameters by the different chemical perturbants with changes in macromolecular structure as the concentration of perturbant was gradually increased. The addition of glycerol and of Cu2+ ions indicated that in aqueous BSA both tryptophan residues are below the surface of the macromolecule, out of contact with solvent water, and, as a consequence, they are statically quenched. “Ultra-Pure” guanidine hydrochloride at 2.4 M or more caused a drastic conformation change, which resulted in the emergence of a visible tyrosine peak at 304 nm in the BSA fluorescence spectrum when either 260- or 270-nm excitation was employed. With the same excitation, the enhancement of BSA tyrosine fluorescence by 6–8 M ultra-pure urea produced only a shoulder near 304 nm in the BSA fluorescence spectrum. We have introduced the use of a new relative quantum yield for protein fluorescence, q′, referenced to the quantum yield of unquenched free tryptophan, which eliminates the quenching action of water from the reference." @default.
• W2024574064 created "2016-06-24" @default.
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• W2024574064 date "1975-02-01" @default.
• W2024574064 modified "2023-10-15" @default.
• W2024574064 title "Static and dynamic quenching of protein fluorescence. I. Bovine serum albumin" @default.
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• W2024574064 doi "https://doi.org/10.1002/bip.1975.360140208" @default.
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