共查询到18条相似文献,搜索用时 390 毫秒
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介绍了近年来出现的超临界流体萃取、加速溶剂萃取、凝胶渗透色谱、固相萃取、固相微萃取、基质固相分散萃取等前处理技术,以及它们在农药残留分析中的应用,并对其发展前景进行了展望。 相似文献
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前处理技术是土壤中农药残留物分析的核心部分,综述了近年来土壤中农药残留分析前处理技术,重点阐述了超声波提取、微波辅助萃取、固相萃取,超临界流体萃取,底物固相分散萃取、固相微萃取等新兴前处理技术。 相似文献
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固相微萃取法(SPME)在农药残留分析中的应用 总被引:11,自引:1,他引:11
固相微萃取(SPME)是一种崭新的无溶剂萃取分离技术,SPME具有灵敏度高,无溶剂、样品用量少,而且简便、快速等优点,已成为分析方法前处理研究的一个方向。本文对固相微萃取技术及其在农药残留分析中的应用做了概述。 相似文献
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分子印迹固相萃取技术在食品安全检测中的应用进展 总被引:1,自引:0,他引:1
分子印迹固相萃取技术(MISPE)是一种高效的样品前处理技术,能从复杂的样品中选择性分离目标物及其结构类似物。分子印迹技术(MIT)在食品中农药和兽药残留检测中的应用得到快速发展。综述了近两年国内外分子印迹固相萃取技术在食品安全检测中农药、兽药残留检测的应用及进展,讨论了当前分子印迹固相萃取技术在食品安全检测应用中存在的问题,并对其发展趋势进行了展望。 相似文献
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Wenlin Huang Christopher J. Smith Charisse J. Walcott James Grainger Donald G. Patterson Jr. 《Polycyclic Aromatic Compounds》2013,33(3-4):339-351
Sample preparation techniques using solid-phase extraction (SPE) and solid-phase microextraction (SPME) are compared for the analysis of monohydroxy polycyclic aromatic hydrocarbons (OHPAH) in human urine. Urine samples spiked with five carbon-13 labeled internal standards are first enzymatically hydrolyzed. Sixteen OHPAH from eight parent compounds (naphthalene, fluorene, phenanthrene, fluoranthene, pyrene, chrysene, benzo[ c ]phenanthrene, and benz[ a ]anthracene) are then extracted along with the internal standards by these two different techniques. The analytes are derivatized by a silylating reagent before final analysis. Final separation and detection are performed by temperature-programmed capillary gas chromatography (GC) and high-resolution mass spectrometry (HRMS). The two extraction techniques are compared for sample preparation time, cost, throughput, reinjection possibility, frequency of outliers, matrix interference, signal linearity, and method detection limit. SPE demonstrates major advantages over SPME for most of these aspects. 相似文献
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Cannabinoids biosynthesis in phytoplankton has attracted much attention due to the rapid development of genetic tools and the optimization of genetic transformation methods in microalgae. To monitor the biosynthesis process, proper sample preparation and practical instrumental methods are needed to measure the various precursors, intermediates, cannabinoids, and their degradation products. The objective of this study was to develop a sample preparation procedure for the quantification of olivetolic acid (OA), cannabigerolic acid (CBGA), cannabidiolic acid (CBDA), tetrahydrocannabinolic acid (THCA), olivetol (OL), cannabidiol (CBD), and tetrahydrocannabinol (THC) using single-quadrupole gas chromatography–mass spectrometry (GC–MS). Isochrysis galbana was used as the model matrix. After methanol extraction, samples were purified using solid phase extraction (SPE), silylated with N-methyl-N-(trimethylsilyl)trifluoroacetamide, and analyzed using GC–MS in electron ionization mode. A strong anion-exchange SPE efficiently recovered OA, CBGA, CBDA, and THCA. A graphitized carbon black SPE was necessary to purify OL, CBD, and THC. Both columns removed amino acids, sugars, polyols, and pigments from the algae extract and prepared samples that are suitable for silylation and GC–MS analysis. The total protocol, including solvent extraction, SPE, silylation, and GC–MS analysis, was validated in accordance with the ICH guidelines. Performance characteristics of our method are superior to existing protocols with similar complexity in the literature. 相似文献