標題: On-line monitoring of Soxhlet extraction by chromatography and mass spectrometry to reveal temporal extract profiles
作者: Chen, Ssu-Ying
Urban, Pawel L.
應用化學系
應用化學系分子科學碩博班
Department of Applied Chemistry
Institute of Molecular science
關鍵字: Extraction kinetics;Hyphenation;On-line methods;Sample preparation;Time-resolved extraction
公開日期: 30-Jun-2015
摘要: Soxhlet extraction is a popular sample preparation technique used in chemical analysis. It enables liberation of molecules embedded in complex matrices (for example, plant tissues, foodstuffs). In most protocols, samples are analyzed after the extraction process is complete. However, in order to optimize extraction conditions and enable comparisons between different types of extraction, it would be desirable to monitor it in real time. The main development of this work is the design and construction of the interface between Soxhlet extractor and GC-MS as well as ESI-MS system. The temporal extract profiles, obtained in the course of real-time GC-MS monitoring, have been fitted with mathematical functions to analyze extraction kinetics of different analytes. For example, the mass transfer coefficients of pinene, limonene and terpinene in lemon sample, estimated using the first-order kinetic model, are 0.540 h(-1), 0.507 h(-1) and 0.722 h(-1), respectively. On the other hand, the Peleg model provides the following extraction rates of pinene, limonene and terpinene: 0.370 nM h(-1), 0.216 nM h(-1) and 0.596 nM h(-1), respectively. The results suggest that both first-order kinetic and Peleg equations can be used to describe the progress of Soxhlet extraction. On-line monitoring of Soxhlet extraction reveals extractability of various analytes present in natural samples (plant tissue), and can potentially facilitate optimization of the extraction process. (C) 2015 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.aca.2015.05.003
http://hdl.handle.net/11536/127881
ISSN: 0003-2670
DOI: 10.1016/j.aca.2015.05.003
期刊: ANALYTICA CHIMICA ACTA
Volume: 881
起始頁: 74
結束頁: 81
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