Microextraction in a tetrabutylammonium bromide/ammonium sulfate aqueous two-phase system and electrohydrodynamic generation of a micro-droplet

Microextraction of methyl orange in the aqueous two-phase system (ATPS) formed by dissolving tetrabutylammonium bromide (TBAB) and ammonium sulfate (AS) is reported. Methyl orange was transported from the AS-rich phase to TBAB-rich phase across the interface of the two immiscible phases. The electro...

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Bibliographic Details
Published in:Journal of Chromatography A 2007-08, Vol.1162 (2), p.180-186
Main Authors: Song, Young Soo, Choi, Young Hoon, Kim, Do Hyun
Format: Article
Language:English
Subjects:
Ammonium Sulfate - chemistry
Analytical chemistry
Aqueous two-phase system (ATPS)
Azo Compounds - chemistry
Azo Compounds - isolation & purification
Chemistry
Droplet generation
Electrochemistry - instrumentation
Electrochemistry - methods
Electrodes
Electrohydrodynamic instability
Exact sciences and technology
General, instrumentation
Hydrogen-Ion Concentration
Microextraction
Polyethylene Glycols - chemistry
Quaternary Ammonium Compounds - chemistry
Water - chemistry
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Summary:Microextraction of methyl orange in the aqueous two-phase system (ATPS) formed by dissolving tetrabutylammonium bromide (TBAB) and ammonium sulfate (AS) is reported. Methyl orange was transported from the AS-rich phase to TBAB-rich phase across the interface of the two immiscible phases. The electrohydrodynamic effect on the shape of the interface of two immiscible flows was also observed by applying dc voltage at the T-junction of the microchannel and the generation of a droplet of AS-rich phase was observed when the potential difference between positive and negative electrodes exceeds a threshold voltage. The minimum voltage necessary for the droplet generation depends on pH due to the degree of dissociation and charge accumulation.
ISSN:0021-9673
DOI:10.1016/j.chroma.2007.06.032