Analysis, separation and physico-chemical characterization of peptide hormones by capillary electrophoresis

I 11 CoNcr,usroNs The work bas demonstrated that capinary zone elechophoresis and micelrar electokinetic cbromatography are high-perfomrance and high-sensitive methods for qualitative and quantitative anďysis and for physico-chemicď characÚerization ofpeptide hormones. using the strategy for the rational selection of experimental conditions for cE analysis and separations ofpeptides, ionogenic peptides were separated as cations in the classical and isoelectric buffers in the acidic region, pH 2- 2'5, and as anions in amphoteric buffer in weakry arkaline conditions, pH = 8'1. Non-ionogenic peptides were analyzed by miceilar electrokinetic chromatography with micelrar phase consisting of anionic detergent sodium dodecylsulphate in alkaline conditions, pH 8.8. The experimental conditions were selected with the aim to avoid the adsorption of peptides on the capillary wall, which was particularly reached with suppression of dissociation of si'anol gÍoups on the imer capillary wall in the acidic pH region and with electrostatic repursion negatively charged peptides from negatively charged dissociation silanol groups on the inner capillary wall in the alkaline pH region. The pH values of background electrolýes were chosen in the region, where the biggest differences in calculated specific charges of analyzed..