期刊
JOURNAL OF CHROMATOGRAPHY A
卷 1217, 期 17, 页码 2768-2775出版社
ELSEVIER
DOI: 10.1016/j.chroma.2010.02.054
关键词
Solid/liquid phase microextraction; Multi-walled carbon nanotube; Hollow fiber; Echinacea purpurea; Caffeic acid; HPLC
资金
- Payame Noor University of Iran
A new design of hollow fiber solid-liquid phase microextraction (HF-SLPME) was developed for the determination of caffeic acid in medicinal plants samples as Echinacea purpure. The membrane extraction with sorbent interface used in this research is a three-phase supported liquid membrane consisting of an aqueous (donor phase), organic solvent/nano sorbent (membrane) and aqueous (acceptor phase) system operated in direct immersion sampling mode. The multi-walled carbon nanotube dispersed in the organic solvent is held in the pores of a porous membrane supported by capillary forces and sonification. It is in contact with two aqueous phases: the donor phase, which is the aqueous sample, and the acceptor phase, usually an aqueous buffer. All microextraction experiments were supported using an Accurel Q3/2 polypropylene hollow fiber membrane (600 mu m I.D., 200 mu m wall thicknesses, and 0.2 mu m pore size). The experimental setup is very simple and highly affordable. The hollow fiber is disposable, so single use of the fiber reduces the risk of cross-contamination and carry-over problems. The proposed method allows the very effective and enriched recuperation of an acidic analyte into one single extract. In order to obtain high enrichment and extraction efficiency of the analyte using this novel technique, the main parameters were optimized. Under the optimized extraction conditions, the method showed good linearity (0.0001-50 mu g/L), repeatability, low limits of detection (0.00005 mu g/L) and excellent enrichment (EF = 2108). (C) 2010 Elsevier B.V. All rights reserved.
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