Journal
ELECTROPHORESIS
Volume 33, Issue 21, Pages 3166-3172Publisher
WILEY-BLACKWELL
DOI: 10.1002/elps.201200141
Keywords
Carboxylic acids; Fluorescence; Indirect detection; Isotachophoresis; Microfluidics
Funding
- Agilent Technologies, Waldbronn, Germany
- Australian Research Council [DP0984745]
- Grant agency of the Czech Republic [P206/12/G014, RVO: 68081715]
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ITP with indirect fluorescence detection (IFD) was introduced three decades ago. Despite this fact, the method has never become widely adopted. The main aim of this work was to utilize the ITPIFD for the separation of carboxylic acids by using a commercially available, portable, microfluidic chip electrophoresis system. On the 16.8-mm effective length separation channel, a maximum of eight carboxylic acids could be separated, with LOD values in a range from 0.12 to 0.4 mM. The commercial chips used for all experiments have multichannel structures important for analysis of more than one sample per a chip in case of standard use. This multichannel structure was used to investigate the possibility of multiple sample loading for ITP separation. Application of ITPIFD was investigated for analysis of benzoate in diet soft drinks and the results were in good agreement with results of a CE method.
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