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Modeling the electrophoresis of highly charged peptides: Application to oligolysines
Author(s) -
Wu Hengfu,
Allison Stuart A.,
Perrin Catherine,
Cottet Herve
Publication year - 2012
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.201100873
Subject(s) - poisson–boltzmann equation , ionic strength , chemistry , electrophoresis , capillary electrophoresis , electrostatics , phosphate , static electricity , chromatography , chemical physics , thermodynamics , analytical chemistry (journal) , computational chemistry , ion , aqueous solution , organic chemistry , physics , quantum mechanics
The “coarse‐grained” bead modeling methodology, BMM, is generalized to treat electrostatics at the level of the nonlinear Poisson–Boltzmann equation. This improvement makes it more applicable to the important class of highly charged macroions and highly charged peptides in particular. In the present study, the new nonlinear Poisson–Boltzmann, NLPB‐BMM procedure is applied to the free solution electrophoretic mobility of low molecular mass oligolysines (degree of polymerization 1–8) in lithium phosphate buffer at pH 2.5. The ionic strength is varied from 0.01 to 0.10 M) and the temperature is varied from 25 to 50°C. In order to obtain quantitative agreement between modeling and experiment, a small amount of specific phosphate binding must be included in modeling. This binding is predicted to increase with increasing temperature and ionic strength.