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This paper reports an on-line sample preconcentration by a sweeping technique based on the surface complexation between TiO 2 (titania) nanoparticles and phosphate groups in the capillary electrophoresis (CE) analysis of phosphopeptides. It is well-known that titania particles can trap phosphopeptides under an acidic condition, while under an alkaline condition they are eluted from the titania surfaces. In the sweeping via solid phase extraction using the titania nanoparticles, a phosphopeptidedoi:10.15583/jpchrom.2016.013 fatcat:gjtrqrq6kbe7jdg6wchhieg74y