共查询到20条相似文献,搜索用时 78 毫秒
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手性离子液体在有机合成中的应用 总被引:1,自引:0,他引:1
近年来,手性离子液体的应用研究取得了重要进展,新的手性离子液体的不断涌现促使人们对其应用研究的兴趣不断提高.本文综述了手性离子液体在有机合成中应用研究的新进展. 相似文献
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毛细管电泳技术在药物分离分析中的研究与应用 总被引:2,自引:0,他引:2
综述了近5年毛细管电泳在手性药物拆分、药物制剂及中草药分析中的应用.在手性药物拆分的应用中主要探讨了手性选择剂的种类及毛细管分离方法;在药物制剂、中草药的应用中主要介绍该法对药效成分进行的分离及定量分析,总结方法的检出限、线性范围和检测方法;最后,探讨了毛细管电泳在求取药物水解常数上的应用.提出毛细管电泳在药物分析中将有广阔的应用前景. 相似文献
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Joseph M. Levy Lori Dolata Robert M. Ravey Eugene Storozynsky Kathy A. Holowczak 《Journal of separation science》1993,16(6):368-371
For many applications using supercritical fluid extraction (SFE), modifiers may be required.This paper will present some findings regarding the use of various modifiers including methanol, hexane, acetone, chloroform, dichloromethane, toluene, and tributylphosphate, in on-line and off-line SFE with cryogenic adsorbent trapping. The specific applications involved the extractions of petroleum hydrocarbons and pesticides from naturally incurred soils. 相似文献
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Supercritical fluid extraction in herbal and natural product studies - a practical review 总被引:1,自引:0,他引:1
Due to increasingly stringent environmental regulations, supercritical fluid extraction (SFE) has gained wide acceptance in recent years as an alternative to conventional solvent extraction for separation of organic compounds in many analytical and industrial processes. In the past decade, SFE has been applied successfully to the extraction of a variety of organic compounds from herbs and other plants. This review article presents the practical aspects of SFE applications in sample preparation, selection of modifiers, collection methods, on-line coupling techniques, means for avoiding mechanical problems, and approaches to optimization of SFE conditions. SFE can also be used to clean up pesticides from herb medicines. SFE processes can be modeled to acquire useful information for better understanding of the extraction, mechanisms and optimization of the extraction procedures. With increasing public interest in natural products, SFE may become a standard extraction technique for studying herbal, food and agricultural samples. 相似文献
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García-Rodríguez D Carro-Díaz AM Lorenzo-Ferreira RA 《Journal of separation science》2008,31(8):1333-1345
This article focuses on the state-of-the-art in sample preparation using supercritical fluid extraction (SFE), to monitor the content of polyhalogenated pollutants in aquaculture and marine environmental samples. Marine sediments and biological applications, including several types of samples matrices (fish, shellfish, seaweed and fish feed) and analyte groups (polychlorinated biphenyls (PCBs), polybrominated biphenyls (PBBs), polybrominated diphenylethers (PBDEs), polychlorinated dibenzo-p-dioxin (PCDD)/Fs and organochlorinated pesticide (OCPs)) are discussed with respect to SFE use and optimisation of conditions. We also discuss the great analytical potential of SFE, the integration of the extraction and clean-up steps for rapid sample processing justifying its use for routine work. The most recent SFE applications to the determination of these pollutants in marine environmental (biota and sediment) samples, published in the last 15 years, are reviewed. 相似文献
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The use of supercritical fluids, especially carbon dioxide, in the extraction of plant volatile components has increased during two last decades due to the expected advantages of the supercritical extraction process. Supercritical fluid extraction (SFE) is a rapid, selective and convenient method for sample preparation prior to the analysis of compounds in the volatile product of plant matrices. Also, SFE is a simple, inexpensive, fast, effective and virtually solvent-free sample pretreatment technique. This review provides a detailed and updated discussion of the developments, modes and applications of SFE in the isolation of essential oils from plant matrices. SFE is usually performed with pure or modified carbon dioxide, which facilitates off-line collection of extracts and on-line coupling with other analytical methods such as gas, liquid and supercritical fluid chromatography. In this review, we showed that a number of factors influence extraction yields, these being solubility of the solute in the fluid, diffusion through the matrix and collection process. Finally, SFE has been compared with conventional extraction methods in terms of selectivity, rapidity, cleanliness and possibility of manipulating the composition of the extract. 相似文献
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Joseph M. Levy Athos C. Rosselli David S. Boyer Kathryn Cross 《Journal of separation science》1990,13(6):418-421
The usefulness and ease of utilizing supercritical fluid extraction (SFE) directly coupled to capillary gas chromatography (GC) as quantitative or qualitative analytical problem-solving tools will be demonstrated. As an alternative to conventional liquid solvent extractions, SFE presents itself as a means to achieve high extraction efficiencies of different compounds in complex solid matrices in very rapid tims frames. Moreover, SFE has an additional advantage of being able to achieve distinct extraction selectivities as a function of the solubilizing power of the supercritical fluid extracting phase. For on-line SFE/GC, the extraction effluent is directly transferred to the analytical chromatograph. On-line SFE/GC involves the decompression of pressurized extraction effluent directly into a heated, unmodified capillary split injection port of the GC. In this respect, SFE introduction into GC can be used as an alternative means of GC injection, comparable to such modes of injection as pyrolysis and thermal desorption. This paper will show applications of SFE/GC where mass spectrometric detection together with flame ionization detection was used for component identification from environmental, tobacco, and petroleum matrices. 相似文献
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Miguel Herrero Jose A. Mendiola Alejandro Cifuentes Elena Ibáñez 《Journal of chromatography. A》2010,1217(16):2495-2511
Among the different extraction techniques used at analytical and preparative scale, supercritical fluid extraction (SFE) is one of the most used. This review covers the most recent developments of SFE in different fields, such as food science, natural products, by-product recovery, pharmaceutical and environmental sciences, during the period 2007–2009. The revision is focused on the most recent advances and applications in the different areas; among them, it is remarkable the strong impact of SFE to extract high value compounds from food and natural products but also its increasing importance in areas such as heavy metals recovery, enantiomeric resolution or drug delivery systems. 相似文献
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超临界流体萃取与其它分析技术的联用 总被引:4,自引:2,他引:4
用超临界流体萑取进行分析样品处理,有快速,高效,低消耗,污染少等优点。本文对SFE的原理,特点,与其它技术的联用及其在分析化学诸领域的应用作了综述,其中重点介绍了SFE与色谱技术的在线联用,内容包括接口等。 相似文献
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A supercritical fluid extraction/enhanced solvent extraction system (SFE/ESE) was used to remove polar and non-polar analytes from various matrices. Extraction of environmental pollutants from soil, additives from low density polyethylene, sulfa drugs from animal tissue, and drug from tablet was performed using both SFE and ESE. Results showed that a single instrumental system can be used to perform both ESE with organic solvents and SFE with carbon dioxide-based fluids. Each method has its own unique advantages and applications. The ability to carry out both solvent extraction and supercritical fluid extraction with one system has obvious economical advantages. 相似文献