Journal
ELECTROPHORESIS
Volume 27, Issue 21, Pages 4295-4302Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elps.200600254
Keywords
capillary electrokinetic chromatography; microchip electrophoresis; nitroaromatic and nitramine explosives; sol-gel
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Microchip-based CEC of nitroaromatic and nitramine explosives with UV absorbance detection is described. The stationary phase was deposited in the microchip using the sol-gel process. Unique to this work, is the exclusive use of alkylated-trimethoxysilane precursors in the gel solution. Using alkylated precursors allows for the synthesis of a hydrophobic stationary phase in a single step. Three sol-gel formulations of increasing hydrophobicity and suitable for the separation of explosives are established from methyl- and ethyl-trimethoxysilane precursors. Increasing the alkyl-chain length improved the resolution significantly, allowing for the separation of up to seven analytes. Direct injection onto the head of the stationary phase for long injection times, results in sub-mg/L detection limits with little effect on separation efficiency.
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