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Counter-pressure-assisted ITP with electrokinetic injection under field-amplified conditions for bacterial analysis
journal contribution
posted on 2023-05-18, 14:10 authored by Phung, SC, Nai, YH, Miroslav MackaMiroslav Macka, Shane PowellShane Powell, Rosanne Guijt, Michael BreadmoreMichael BreadmoreCounter-pressure was used to extend the duration of field-amplified sample injection in isotachophoresis (FASI-ITP) in order to improve the detection of bacterial cells. Using 0.51-μm negatively charged encapsulated fluorescent beads as a model, the counter-pressure, injection and separation voltages, and times were optimized. Using 6-min 8,963-Pa counter-pressure FASI-ITP injections at −12 kV followed by mobilization of the ITP band with continued injection at −6 kV, the limit of detection (LOD) for Escherichia coli was improved to 78 cells/mL, a factor of 4 when compared with FASI-ITP without counter-pressure.
History
Publication title
Analytical and Bioanalytical ChemistryVolume
407Issue
23Pagination
6995-7002ISSN
1618-2642Department/School
School of Natural SciencesPublisher
Springer-Verlag HeidelbergPlace of publication
Tiergartenstrasse 17, Heidelberg, Germany, D-69121Rights statement
Copyright 2015 Springer-Verlag Berlin HeidelbergRepository Status
- Restricted