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• W2094896922 endingPage "287" @default.
• W2094896922 startingPage "273" @default.
• W2094896922 abstract "Peptide mapping by capillary electrophoresis (CE) with UV detection is problematic for the characterization of proteins that can only be obtained at low micromolar concentrations. Dilution of peptide fragments during digestion of the protein can further reduce the detection sensitivity in peptide mapping to the point where analysis at sub-micromolar concentrations is not possible. A remedy to this problem is preconcentration (sample enrichment) of the proteolytic digest by solid-phase extraction (SPE). To minimize non-specific adsorptive losses during sample handling, on-line SPE-CE is preferred. However, packed-inlet SPE-CE is not always feasible due to either instrument or sample limitations. We describe here a simple method of preconcentration by discontinuous on-line SPE-CE, specifically applied to peptide mapping in low-pH separation buffer after protein digestion in a solid-phase enzyme microreactor. The SPE-CE system does not require application of a low pressure during electrophoretic separation to overcome reversed electroosmotic flow because the preconcentrator device is disconnected from the separation capillary before the electric field is applied. Up to a 500-fold preconcentration factor can be achieved with this device, which can be reused for many samples. Parameters such as the volume of desorption solution, the adsorption/desorption (chromatographic) process, reproducibility of packing the SPE preconcentrator and effects of sample concentration on the peptide map are investigated." @default.
• W2094896922 created "2016-06-24" @default.
• W2094896922 creator A5044690619 @default.
• W2094896922 creator A5058795992 @default.
• W2094896922 date "1999-12-01" @default.
• W2094896922 modified "2023-10-18" @default.
• W2094896922 title "Characterization of a solid-phase extraction device for discontinuous on-line preconcentration in capillary electrophoresis-based peptide mapping" @default.
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• W2094896922 doi "https://doi.org/10.1016/s0378-4347(99)00472-7" @default.
• W2094896922 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/10677008" @default.
• W2094896922 hasPublicationYear "1999" @default.
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