共查询到19条相似文献,搜索用时 125 毫秒
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天然产物分离技术的新进展 总被引:2,自引:0,他引:2
本文对最新发展起来的高速逆流色谱,超临界流体色谱,高效毛细管电泳,胶束电动毛细管层析,微柱液相色谱和反复循环高效液相色谱法在分离天然产物中的应用作一简单介绍。 相似文献
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甲氰菊酯是一种广谱、高效杀虫杀螨剂。文献报道的分析方法有气相色谱、毛细管色谱、薄层色谱、反相高效液相色谱,为配合我所甲氰菊酯的合成研究,我们采用正相高效液相色谱法对合成的甲氰菊酯进行定性定量分析,并作了气相色谱和高效液相色谱分析对照,说明该方法准确可靠、简便。 相似文献
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独一味是藏族传统用药,用于治疗各种出血症。本文总结了独一味药材及其制剂的分析方法,为提高其质量标准提供参考。分析方法有液相色谱法、液相色谱-质谱联用法、气相色谱-质谱联用法、毛细管电泳法、超高效合相色谱法、紫外可见分光光度法、核磁共振氢谱法和电感耦合等离子体光谱法,其中液相色谱法最为常用。后续建议在质量标志物理论的指导下,较为全面地分析和预测其质量内涵,并选用合适的分析方法对其质量进行评价。 相似文献
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Stuart A. Oehrle 《Propellants, Explosives, Pyrotechnics》1997,22(1):1-3
Recently a new explosive, 3-Nitro-1,2,4-triazole-5-one (NTO) has attracted interest as possible replacements for or inclusion in various military propellants and explosives. Analysis of NTO compounds as well as 14 other nitramine and nitroaromatic explosives could be accomplished by capillary electrophoresis using a technique known as MECC, micellar electrokinetic capillary chromatography. A borate/boric acid buffer with sodium dodecylsulfate (SDS) was used in conjunction with direct UV detection at 185 nm. 相似文献
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Lisbeth Ingvardsen Søren Michaelsen Hilmer Sørensen 《Journal of the American Oil Chemists' Society》1994,71(2):183-188
A method of analysis for determination of phospholipids by micellar electrokinetic capillary chromatography (MECC) has been
developed. Sodium cholate (NaCh) was found suitable as the micellar phase, and 1-propanol was important in obtaining an efficient
separation of individual phospholipids and as organic solvent required for acceptable solubility of the phospholipids. With
equal volatility of water and organic modifier, only minor changes in effects from the modifier occur during analysis. The
influence of changes in high-performance capillary electrophoresis-MECC separation conditions were evaluated in terms of migration
time, relative migration time (RMT), relative normalized area (RNA), resolution and theoretical plates per meter. The method
has several advantages compared to high-performance liquid chromatography: The total time of analysis is less than 25 min,
and only small amounts of reagents and sample are required. Relative standard deviations were 0.26–0.48% for RMT, 1.7–2.9%
for RNA, and in the linearity test correlation coefficients of 0.999 were obtained. Results from analyses of the phospholipid
compositions of soybean and rapeseed lecithins are presented. 相似文献
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高效毛细管电泳 ( HPCE)在手性拆分中的应用近年受到普遍关注。含有手性添加剂环糊精 ( CD)及其衍生物的毛细管区带电泳 ( CZE)和胶束电动毛细管色谱 ( MECC)拆分体系方面研究非常活跃。综述了 CD- CZE和 CD-MECC体系 ,探讨了各体系的拆分机理和各实验条件对拆分结果的影响。 相似文献
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胶束毛细管电泳法测定有机磷农药的研究 总被引:3,自引:0,他引:3
本论文着重研究了毛细管胶束电泳-紫外检测氧乐果、乐果、敌百虫的分析方法。采用胶束电动毛细管色谱法(MEKC)技术对这三种有机磷农药进行分离,并研究了分析电压、表面活性剂十二烷基硫酸钠(SDS)、电泳缓冲溶液浓度、有机改性剂(甲醇)、进样时间及pH值等对分离测定的影响。当分离电压为20kV,检测波长195nm,在pH值为8.50的150mmol/L硼砂-150mmol/L硼酸的缓冲液与11mmol/L十二烷基硫酸钠和4%甲醇的混合溶液中,在30mbar下进样15s的最佳条件下,3种有机磷农药在最短时间内达到基线分离。在优化条件下,用MEKC方法进行测试。它们的检测限分别为0.11μg/ml、0.06μg/ml、0.10μg/ml。迁移时间和峰高的变异系数分别为0.75%~1.9%、0.44%~0.76%。 相似文献
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Thermobalance hydropyrolysis experiments are carried out on a highly volatile coal sample and its main macerals, vitrinite and exinite. The results are discussed according to the characterization of the tars using ultrasound solvent extractions, extrography, liquid chromatography, capillary gas chromatography and mass spectrometry. 相似文献
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《分离科学与技术》2012,47(12-13):1891-1904
Abstract Important criteria for the effective separation of compounds of biological or environmental interest by micellar electrokinetic capillary chromatography are discussed. Efficiencies of approximately 100,000 plates/meter are achieved in the separations of samples of defivatized amines, aflatoxins, and hydroxy aromatic compounds. Laser fluorometric detection is shown to be capable of detecting subpicogram injected quantities. Organic solvents such as 2-propanol and acetonitrile are added to the aqueous mobile phases normally used to improve the separation of hydrophobic compounds, impart different selectiv-ities, and provide a means for gradient programming. Column diameter is found to influence efficiency, analysis time, and detection. 相似文献
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用毛细管胶束电泳法测定了番茄中环境激素2,4-滴的含量。研究了电泳缓冲液的种类、体积分数、pH值和有机调节剂乙醇的变化对分离效果的影响。在分析电压为25kV、pH值7.0、20mmol/L磷酸氢二钠缓冲液 30%乙醇为缓冲溶液、检测波长225nm条件下,在线性质量浓度范围为6.0×10-1~9.375×10-4g/L时,回归方程为y=0.00135x-0.00214,相关系数r=0.99967,检测限为0.9375mg/L;测得样品中2,4-滴的含量为0.07598mg/kg,回收率范围为98.2%~104.6%,其RSD为2.1%~4.5%。该方法具有操作简单、快速方便及自动化程度高、重现性好等优点。 相似文献