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1.
高效毛细管电泳   总被引:9,自引:3,他引:6  
邓延倬  于沛 《分析化学》1992,20(10):1214-1221
2.
Nd比值测定中的Sm、Nd分离——HDEHP分离法   总被引:3,自引:0,他引:3       下载免费PDF全文
利用一种涂结型阳离子分离交换树脂分离测定Sm-Nd年龄中的Sm、Nd二元素。本文详细介绍了这种方法的基本原理和树脂制备、装柱条件及化学分离过程。并且与测定Sm-Nd同位素年龄中的另一种Sm、Nd元素分离方法(α-羟基异丁酸HBAR分离法)进行了比较。  相似文献
3.
We review the literature on the analysis of pharmaceutically-derived cytostatic compounds in the environment. Cytostatics are a major class of chemotherapy drugs used extensively in the fight against cancer. They are a broad group of mostly organic compounds possessing a diverse range of physico-chemical parameters. Their differences and their presence in the environment in trace amounts make their determination in complex matrices a major challenge. Despite the good scientific foundations laid by those in the field, it is apparent that past research has focused mainly on hospital effluents and few have analyzed environmental samples. Importantly, no study has looked at environmental transformation products that, along with human metabolites, could contribute to overall toxicity. To improve understanding of the chemodynamics of cytostatics in natural waters, it is essential to have more data on the occurrence and the fate of these compounds, including their human metabolites and environmental transformation products. This approach will require advanced sampling techniques and state-of-the-art analytical tools, including the latest separation methods and cutting-edge instrumentation.  相似文献
4.
A comprehensive review is presented addressing recent trends in the speciation and determination of vanadium in environmental and biological sample matrices, including important analytical aspects such as sample clean up, pre-concentration and method development. Methodology based on both separation and spectroscopic techniques for the determination of vanadium speciation is discussed. A brief outline of analytical principles, together with an overview of the recent developments and applications of vanadium speciation determination is included. The newer methods for detecting metal ions including hyphenated spectroscopic techniques and sample preparation schemes are also discussed.  相似文献
5.
采用毛细管电泳相互作用分析法建立了一种直接评价污染物毒性的新方法。分别将毛细管区带电泳、胶柬电动力色谱与配体分离法结合,对苯醌和小牛胸腺DNA混合温育后的体系进行相互作用研究。研究发现,苯醌对小牛胸腺DNA能产生相互作用并形成DNA加合物,获得了苯醌对小牛胸腺DNA有损伤作用的判断。由于苯醌是苯在体内的代谢终产物,因此认为苯醌对DNA的损伤是苯致癌的途径之一。  相似文献
6.
In the last few decades, many new antiepileptic drugs came out to medicine world, and their use was expanded over a wide range of cases. Analysts from all over the world developed many different separation methods for the determination of these drugs in a quantitative way either in pharmaceutical dosage forms or in biological fluids. In this review article, a summation of previously published separation methods including high-performance thin-layer chromatography, high-performance liquid chromatography, gas chromatography, and electrophoresis used for the determination of eslicarbazepine acetate, levetiracetam, lacosamide, oxcarbazepine, pregabalin, and retigabine are presented. These six drugs are the most commonly used drugs for the treatment of patients diagnosed with partial onset seizures. This article can help researchers and analysts to build upon this knowledge and add further methods of analysis in the future.  相似文献
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8.
Processable films of metal–organic frameworks (MOFs) have been long sought to advance the application of MOFs in various technologies from separations to catalysis. Herein, MOF–polymer mixed‐matrix membranes (MMMs) are described, formed on several substrates using a wide variety of MOF materials. These MMMs can be delaminated from their substrates to create free‐standing MMMs that are mechanically stable and pliable. The MOFs in these MMMs remain highly crystalline, porous, and accessible for further chemical modification through postsynthetic modification (PSM) and postsynthetic exchange (PSE) processes. Overall, the findings here demonstrate a versatile approach to preparing stable functional MMMs that should contribute significantly to the advancement of these materials.  相似文献
9.
The provision of pure enantiomers is of increasing importance not only for the pharmaceutical industry but also for agrochemistry and biotechnology. In general, there are two rival approaches to provide pure enantiomers. The “chiral” approach is based on developing an asymmetric synthesis of just one of the enantiomers, while the “racemic” approach is based on separating mixtures of the two enantiomers. In the last few years remarkable progress has been achieved in the latter area. This Review focuses in particular on enantioselective crystallization processes and preparative chromatography, including hybrid processes and the incorporation of racemization steps. Several examples from our research are used for illustration purposes.  相似文献
10.
This paper describes the development of a sequential injection chromatography (SIC) procedure for separation and quantification of the herbicides simazine, atrazine, and propazine exploring the low backpressure of a 2.5 cm long monolithic C18 column. The separation of the three compounds was achieved in less than 90 s with resolution >1.5 using a mobile phase composed by ACN/1.25 mmol/L acetate buffer (pH 4.5) at the volumetric ratio of 35:65 and flow rate of 40 μL/s. Detection was made at 223 nm using a flow cell with 40 mm of optical path length. The LOD was 10 μg/L for the three triazines and the quantification limits were of 30 μg/L for simazine and propazine and 40 μg/L for atrazine. The sampling frequency is 27 samples per hour, consuming 1.1 mL of ACN per analysis. The proposed methodology was applied to spiked water samples and no statistically significant differences were observed in comparison to a conventional HPLC–UV method. The major metabolites of atrazine and other herbicides did not interfere in the analysis, being eluted from the column either together with the unretained peak, or at retention times well‐resolved from the studied compounds.  相似文献
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