Hydration, charge, size, and shape characteristics of peptides from their CZE analyses

Abstract

A capillary zone electrophoresis model is presented for peptide characterization, on the base of well established physicochemical equations.The effective mobility is used as basic data in the model to estimate relevant peptide properties like, for instance, hydration, net and total electrical charge numbers, hydrodynamic size and shape, particle average orientation, and pH-microenvironment from the charge regulation phenomenon. Therefore 102 experimental effective mobilities of different peptides are studied and discussed in relation to previous works. An equation for the estimation of peptide hydration as a function of ionizing, polar and non polar amino acid residues is included in the model. It is also shown that the shape-orientation factor of peptides may be either lower or higher than one, and its value depends on a complex interplay among mainly charge number, molar mass, hydration and amino acid sequence.