Journal
ANALYTICAL SCIENCES
Volume -, Issue -, Pages -Publisher
SPRINGERNATURE
DOI: 10.1007/s44211-023-00456-9
Keywords
Microchip electrophoresis; On-line sample preconcentration; LVSEP; FASI; Y-form channel
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This study eliminates complicated voltage controls in highly sensitive microchip electrophoresis (MCE) analyses by combining two online sample preconcentration techniques, large-volume sample stacking with an electroosmotic flow (LVSEP) and field-amplified sample injection (FASI). The cross-channel microchips and multichannel high-voltage power supply are replaced by Y-channel chips and a conventional power supply designed for capillary electrophoresis. By simple switching of the electric circuit, the focused analytes can be separated during anodic migration in a separation channel. The method achieves significant sensitivity enhancement and baseline separation in the analysis of fluorescein and oligosaccharides.
To eliminate complicated voltage controls for highly sensitive microchip electrophoresis (MCE) analyses on the basis of combining two online sample preconcentration techniques, large-volume sample stacking with an electroosmotic flow (EOF) pump (LVSEP) and field-amplified sample injection (FASI), cross-channel microchips and a multichannel high-voltage power supply were replaced to Y-channel chips and a conventional power supply designed for capillary electrophoresis, respectively. By simple switching of the electric circuit after the LVSEP-FASI sample enrichments, the focused analytes could be separated during anodic migration in a separation channel. In the LVSEP-FASI analysis of fluorescein using the Y-channel microchip, the maximum sensitivity enhancement factor (SEF) of 7400 was achieved, resulting in a 30-fold detectability increase compared to the conventional LVSEP. The developed method was applied to the oligosaccharide analysis in MCE. As a result, the SEF for maltotriose was improved from 450 to 2300 and the baseline separation of the oligosaccharides was achieved without any complicated voltage control in LVSEP-FASI on the Y-channel chips.
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