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Phytochem Anal

Title:		Dynamic ultrasonic nebulisation extraction coupled with headspace ionic liquid-based single-drop microextraction for the analysis of the essential oil in Forsythia suspensa
Author(s):		Yang J; Wei H; Teng X; Zhang H; Shi Y;
Address:		"Department of Chemistry, Jilin University, Changchun, 130012, P.R. China"
Journal Title:		Phytochem Anal
Year:		2014
Volume:		20131218
Issue:		2
Page Number:		178 - 184
DOI:		10.1002/pca.2490
ISSN/ISBN:		1099-1565 (Electronic) 0958-0344 (Linking)
Abstract:		"INTRODUCTION: Ionic liquids have attracted much attention as an extraction solvent instead of traditional organic solvent in single-drop microextraction. However, non-volatile ionic liquids are difficult to couple with gas chromatography. Thus, the following injection system for the determination of organic compounds is described. OBJECTIVE: To establish an environmentally friendly, simple, and effective extraction method for preparation and analysis of the essential oil from aromatic plants. METHODS: The dynamic ultrasonic nebulisation extraction was coupled with headspace ionic liquid-based single-drop microextraction(UNE-HS/IL/SDME)for the extraction of essential oils from Forsythia suspense fruits. After 13 min of extraction for 50 mg sample, the extracts in ionic liquid were evaporated rapidly in the gas chromatography injector through a thermal desorption unit (5 s). The traditional extraction method was carried out for comparative study. RESULTS: The optimum conditions were: 3 muL of 1-methyl-3-octylimidazolium hexafluorophosphate was selected as the extraction solvent, the sample amount was 50 mg, the flow rate of purging gas was 200 mL/min, the extraction time was 13 min, the injection volume was 2 muL, and the thermal desorption temperature and time were 240 degrees C and 5 s respectively. Comparing with hydrodistillation (HD), the proposed method was environment friendly and efficient. CONCLUSION: The proposed method is environmentally friendly, time saving, with high efficiency and low consumption. It would extend the application range of the HS/SDME and would be useful especially for aromatic plants analysis"
Keywords:		"Forsythia/*chemistry Fruit/chemistry Gas Chromatography-Mass Spectrometry/*methods Imidazoles Ionic Liquids Liquid Phase Microextraction/*methods Octanes Oils, Volatile/analysis/*isolation & purification Solvents Temperature Time Factors Ultrasonics Volat;"
Notes:		"MedlineYang, Jinjuan Wei, Hongmin Teng, Xiane Zhang, Hanqi Shi, Yuhua eng England 2013/12/19 Phytochem Anal. 2014 Mar-Apr; 25(2):178-84. doi: 10.1002/pca.2490. Epub 2013 Dec 18"