共查询到19条相似文献,搜索用时 156 毫秒
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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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酚类环境雌激素是最为常见的环境雌激素之一,其对人类、环境和生态的影响受到世界范围的关注.介绍了酚类环境雌激素的种类和毒性,详细讨论了各种样品前处理技术,包括溶剂萃取、索氏提取、固相萃取、基质固相分散萃取、微波辅助萃取、加速溶剂萃取、膜萃取、固相微萃取、搅拌棒吸附萃取、分子印迹聚合物萃取、超声辅助萃取、离子液体萃取、浊点萃取、超临界流体萃取等,并对酚类环境雌激素的样品前处理技术进行了总结和展望. 相似文献
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综述了利用固相萃取柱、固相萃取膜、固相微萃取三种固相萃取技术检测环境水样中多环芳烃的方法,并对其发展趋势进行了展望. 相似文献
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天然产物资源丰富,其高效利用离不开先进的分离技术。兼具离子液体高选择性及聚合物安全、易回收等特性的聚离子液体为天然产物的分离提供了新途径。在介绍聚阳离子型、聚阴离子型和聚两性型离子液体制备技术的基础上,综述了使用聚离子液体的固相萃取、固相微萃取、分子印迹固相萃取、液液萃取及毛细管电泳技术在黄酮类、生物碱类、酚类、蛋白质类等天然产物分离中的研究进展,分析了聚离子液体分离作用机理及其具有良好的分离效率、稳定性和回收再利用性能的原因,特别强调了刺激响应聚离子液体在天然产物分离中的优势,并从聚离子液体设计和定制出发对聚离子液体在分离领域所存在的挑战和潜在的应用进行了展望。 相似文献
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通过优化萃取和净化条件,建立了一种快速测定天然矿泉水中15种有机氯农药的气相色谱方法。采用正己烷萃取和弗罗里硅土固相萃取柱对样品净化,毛细管柱分离,用配有电子捕获检测器的气相色谱进行检测,平均加标回收率为86.4%~108.0%,相对标准偏差( RSD, n=11)为0.95%~4.75%,检出限为0.69~1.85 ng/L。方法简单、快捷、经济,适应于天然矿泉水中的15种有机氯农药的测定。 相似文献
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分子印迹技术在固相萃取中的应用与展望 总被引:12,自引:0,他引:12
20世纪90年代以来,具有构效预定性、特异识别性和广泛实用性等特点的分子印迹技术在异构体及手性分离、化学仿生传感器、模拟酶催化、膜分离及固相萃取等领域的研究较多. 固相萃取技术作为一种比液液萃取更好、更快速、更简便的分离技术,是近30年来才快速发展起来的.以印迹聚合物作为固相萃取填料是分子印迹技术最具应用前景的一个方向.对分子印迹技术及固相萃取技术的基本原理及方法进行了简单介绍,并着重介绍了近年来分子印迹技术在固相萃取中的应用,如环境样品分析、药物分离与分析、生物与临床医学检测等,并对两种技术结合取得的成果、面临的问题及应用前景进行了展望. 相似文献
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痕量环境有机污染物分析中的样品前处理技术 总被引:11,自引:0,他引:11
综述了微量有机污染物的分析中一些主要预处理方法的最近进展。阐明固相萃取、固相微萃取和超临界流体萃取的原理、特点和应用。 相似文献
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Wanru Wang Panliang Zhang Kewen Tang Weifeng Xu 《American Institute of Chemical Engineers》2019,65(1):259-269
A new and efficient method was explored to continuously separate (−)-epigallocatechin-3-gallate (EGCG) from tea polyphenols (TPs) by fractional extraction in centrifugal contactor separators (CCSs). The effects of different organic solvents on distribution behavior of monomers of TPs were studied, and two green extraction systems were established without reactive extractant. Based on phase equilibrium and the law of conservation of mass, a fractional extraction model was developed to investigate the influence of the process parameters such as phase ratio and the number of stages on extraction efficiency. By simulation and optimization, optimal parameters can be obtained for the separation of EGCG. EGCG can be separated by batch and continuous separation. Excellent results can be achieved by the two methods with high purity, high yield, and large output. Compared to the batch method, the continuous separation is more suitable for production in an industrial scale due to low-cost and continuous separation. © 2018 American Institute of Chemical Engineers AIChE J, 65: 259–269, 2019 相似文献
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Molecularly imprinted polymers for the selective recognition of l‐phenylalanine based on 1‐buty‐3‐methylimidazolium ionic liquid
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To enhance the affinity of 4‐vinyl pyridine to l ‐phenylalanine (l ‐Phe) and convert the imprinting process from the aqueous phase to the organic phase, an oil‐soluble amino acid ionic liquid was introduced as a template. In this study, 1‐butyl‐3‐methylimidazolium α‐aminohydrocinnamic acid salt was first applied to prepared surface molecularly imprinted polymers (MIPs) in acetonitrile for the selective recognition of l ‐Phe. Fluorescence quenching analysis of the functional monomer on the template was investigated under different conditions to study the imprinting mechanism. Several binding studies, such as the sorption kinetics, sorption thermodynamics, and solid‐phase extraction application, and the chiral resolution of racemic phenylalanine were investigated. The binding isotherms were fitted by nonlinear regression to the Freundlich model to investigate the recognition mechanism. The affinity distribution analysis revealed that polymers imprinted by ionic liquid showed higher homogeneous binding sites than those imprinted by l ‐Phe. The competition tests were conducted by a molecularly imprinting solid‐phase extraction procedure to estimate the selective separation properties of the MIPs for l ‐Phe. The target MIP was shown to be successfully for the separation of l ‐Phe from an amino acid mixture. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42485. 相似文献
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环境样品中的砷、汞含量很低,并且组分复杂,因此环境样品前处理在分析检测中尤为重要。而纳米TiO2分离预富集在环境样品的预处理方法中相对较少报道。作为一种样品预处理技术,在环境样品的砷、汞检测中起着至关重要的作用。文章简述了几种常用的样品富集预处理技术:固相萃取富集、液液萃取富集、共沉淀富集、电化学富集;重点介绍了纳米TiO2分离预富集技术,并结合氢化物发生-原子荧光光谱法在检测环境样品中砷、汞的应用进行了综述。最后,对纳米TiO2分离富集的预处理技术在环保以及其他分析领域的发展前景予以了展望。 相似文献