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首页> 外文期刊>Talanta: The International Journal of Pure and Applied Analytical Chemistry >In matrix formation of deep eutectic solvent used in liquid phase extraction coupled with solidification of organic droplets dispersive liquid-liquid microextraction; application in determination of some pesticides in milk samples
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In matrix formation of deep eutectic solvent used in liquid phase extraction coupled with solidification of organic droplets dispersive liquid-liquid microextraction; application in determination of some pesticides in milk samples

机译：以液相萃取用于液相萃取的深层共晶溶剂的基质形成，耦合有机液滴分散液 - 液微萃取的凝固; 在牛奶样中测定一些杀虫剂的应用

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In this work, a liquid-phase extraction procedure and dispersive liquid-liquid microextraction method based on deep eutectic solvents were combined and used for the simultaneous extraction of different classes of pesticides; including carbaryl, hexythiazox, pretilachlor, iprodione, famoxadone, sethoxydim and fenazaquin from milk samples. In the first step, a deep eutectic solvent was synthesized in milk sample and simultaneously, was used for extraction of the analytes along with precipitation of milk proteins. To assist the formation of the deep eutectic solvent and increasing the mass transfer rate of the analytes, ultrasonic irradiations was used. In the second step, the collected organic phase from pervious step was mixed (as dispersive solvent) with a water immiscible deep eutectic solvent (ChCl: decanoic acid) and injected into deionized water. The cloudy solution was placed into an ice bath and the extraction solvent was solidified on the top of the solution. After removing the solid phase by a spatula, it was melted at room temperature and 1 mu L of the extraction solvent was injected into the separation system. Under the optimum extraction conditions, low limits of detection and quantification within the ranges of 0.90-3.9 and 3.1-13 ng mL(-1) were achieved, respectively. Precision of the method expressed as relative standard deviation was in the ranges of 3.8-5.3 and 4.8-6.9 for intra- and inter-day (n = 5) precision, respectively, at a concentration of 50 ng mL(-1) of each analyte. Extraction recoveries and enrichment factors were between 64 and 89% and 320 and 445, respectively. Lastly, several milk samples were successfully analyzed using the proposed method.
机译：在这项工作中，合并基于深凝胶溶剂的液相萃取程序和分散液 - 液微萃取方法，用于同时提取不同类别的农药;包括Carbaryl，己酸己唑，预热素，Iprodione，Famoxadone，Sethoxydim和来自牛奶样品的芬佐基因。在第一步中，在牛奶样品中合成了深度共晶溶剂，同时用于萃取分析物以及乳蛋白的沉淀。为了帮助形成深度共晶溶剂并增加分析物的传质速率，使用超声波照射。在第二步中，将来自透水步骤的收集的有机相混合（作为分散溶剂），水不混溶深共晶溶剂（CHCl：癸酸）并注入去离子水中。将浑浊的溶液置于冰浴中，萃取溶剂在溶液顶部固化。通过刮刀除去固相后，将其在室温下熔化，将1μl萃取溶剂注入分离系统。在最佳提取条件下，分别在0.90-3.9和3.1-13ng ml（-1）的范围内的低检测和定量限制。表达为相对标准偏差的方法的精度分别在每天内（n = 5）精度为3.8-5.3和4.8-6.9的范围，以每种浓度为50ng ml（-1）分析物。提取回收率和富集因子分别为64至89％和320和445。最后，使用该方法成功分析了几种牛奶样品。

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