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• W2053120203 abstract "The reaction between alpha,alpha-dialkylated amino acids and amino acid N-carboxyanhydrides is slow leading to low concentrations of products (peptides). The detection by capillary electrophoresis of the analytes contained in such samples is therefore a challenging issue. In this work, on-line sample pre-concentration methods based on field-amplified sample stacking have been implemented and compared. Because of the high ionic strength present in the sample matrix, samples were diluted with an organic solvent prior to analysis to decrease the sample conductivity. Different modes of sample injection (field amplified sample injection (FASI), hydrodynamic normal sample stacking (NSS) or large volume sample stacking (LVSS)) were compared. Pre-concentration factors of 20 for FASI, about 30-40 for NSS and 60 for LVSS were obtained for the analysis of (l,l) dipeptide of valine in a large excess of isovaline and 0.2M of ionic strength. For LVSS application and resolution optimisation, a new non-covalent coating based on the partial modification of the capillary surface was used to tune the electroosmotic flow magnitude and to pump the sample matrix out of the capillary. This on-line sample pre-concentration step allowed confirming that oligopeptides including alpha,alpha-dialkylated amino acids are formed during the reaction between alpha,alpha-dialkylated amino acids and N-carboxyanhydride amino acids." @default.
• W2053120203 created "2016-06-24" @default.
• W2053120203 creator A5010675967 @default.
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• W2053120203 date "2009-07-01" @default.
• W2053120203 modified "2023-09-24" @default.
• W2053120203 title "On-line sample stacking of peptides in capillary electrophoresis for the study of prebiotic reactions between α,α-dialkylated amino acids and amino acid N-carboxyanhydrides" @default.
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• W2053120203 doi "https://doi.org/10.1016/j.chroma.2009.06.010" @default.
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