High-performance liquid chromatography of amino acid peptides and proteins |
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Authors: | M T W Hearn A N Hodder P G Stanton M I Aguilar |
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Institution: | (1) Department of Biochemistry, Monash University, 3168 Clayton, Victoria, Australia |
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Abstract: | Summary The retention behaviour of seven globular proteins ranging in molecular weight from 12,000 to 69,000 was investigated using
Mono-Q anion-exchange resin as the stationary phase and sodium chloride as the displacer salt. In particular the influence
of changes in ionic strength and mobile phase pH on the isocratic retention properties was assessed. Several proteins were
found to have significant retention when the pH of the mobile phase was below the reported pl values of the proteins. This
behaviour results from the non-uniform charge distribution on the protein surface, which allows interaction with the charged
stationary phase even though the protein net charge is equal to or greater than zero. The influence of pH and ionic strength
on experimentally observed bandwidths was also investigated. The dependence of the effective reduced plate height on solute
capacity factor was found to vary significantly with the mobile phase pH, a behaviour consistent with the interplay of complex
multisite binding kinetics. These results provide a basis for further detailed investigations into the mechanism of interaction
of proteins not only with charged surfaces associated with adsorptive chromatographic media but also with other macromolecules.
For Part LXXXII, see ref. 27]. |
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Keywords: | Anion-exchange chromatography Proteins Retention and bandwidth relationship |
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