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Anal Chim Acta

Title:		Homogeneous ionic liquid microextraction of the active constituents from fruits of Schisandra chinensis and Schisandra sphenanthera
Author(s):		Xiao Y; Zhang H;
Address:		"College of Chemistry, Jilin University, Changchun, PR China"
Journal Title:		Anal Chim Acta
Year:		2012
Volume:		20111123
Issue:
Page Number:		78 - 84
DOI:		10.1016/j.aca.2011.11.033
ISSN/ISBN:		1873-4324 (Electronic) 0003-2670 (Linking)
Abstract:		"Homogeneous ionic liquid microextraction (HILME) was developed for the extraction of schizandrin, schisantherin A and deoxyschizandrin from Schisandra chinensis and Schisandra sphenanthera. 1-Butyl-3-methylimidazolium tetrafluoroborate ([C(4)MIM][BF(4)]) aqueous solution was used as extraction solvent, and ammonium hexafluorophosphate ([NH(4)][PF(6)]) was used as ion-pairing agent. 1-Butyl-3-methylimidazolium hexafluorophosphate ([C(4)MIM][PF(6)]), which is barely soluble in water, was formed in situ, and was used as sample solution. High-performance liquid chromatography (HPLC) was employed for separation and determination of the analytes. The calibration curve showed good linear relationship (r>0.9998). The recoveries were between 69.71% and 88.33% with RSDs lower than 4.86%. External standard method was adopted in the proposed method, and internal standard method was applied for the evaluation of the proposed method. The two methods were compared and the results indicated that the proposed method was acceptable and simple. The HILME is free of volatile organic solvents, and represents lower expenditures of sample, extraction time and solvent, compared with ultrasonic and Soxhlet extraction. There was no obvious difference in the extraction yields of active constitutions obtained by the three extraction methods"
Keywords:		"*Chromatography, High Pressure Liquid Cyclooctanes/chemistry/isolation & purification Dioxoles/chemistry/isolation & purification Fruit/chemistry Imidazoles/chemistry Ionic Liquids/*chemistry Lignans/chemistry/isolation & purification Polycyclic Compounds;"
Notes:		"MedlineXiao, Yao Zhang, Hanqi eng Netherlands 2011/12/20 Anal Chim Acta. 2012 Jan 27; 712:78-84. doi: 10.1016/j.aca.2011.11.033. Epub 2011 Nov 23"