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• W2060968906 abstract "Ultrasound assisted extraction (UAE) followed by dispersive liquid–liquid microextraction (DLLME) was used for extraction and preconcentration of volatile constituents of six tea plants. The preconcentrated compounds were analyzed by gas chromatography–mass spectrometry (GC–MS). Totally, 42 compounds were identified and caffeine was quantitatively determined. The main parameters (factors) of the extraction process were optimized by using a central composite design (CCD). Methanol and chloroform were selected as the extraction solvent and preconcentration solvent, respectively .The optimal conditions were obtained as 21 min for sonication time; 32 °C for temperature; 27 μL for volume of extraction solvent and 7.4% for salt concentration (NaCl/H2O). The determination coefficient (R2) was 0.9988. The relative standard deviation (RSD %) was 4.8 (n=5), and the enhancement factors (EFs) were 4.0–42.6." @default.
• W2060968906 created "2016-06-24" @default.
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• W2060968906 date "2013-03-01" @default.
• W2060968906 modified "2023-09-30" @default.
• W2060968906 title "Determination of volatile components of green, black, oolong and white tea by optimized ultrasound-assisted extraction-dispersive liquid–liquid microextraction coupled with gas chromatography" @default.
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• W2060968906 doi "https://doi.org/10.1016/j.chroma.2013.01.029" @default.
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