Department of Analytical Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran.
Engineering Faculty, Near East University, Mersin, Turkey.
J Sci Food Agric. 2019 Jun;99(8):4094-4104. doi: 10.1002/jsfa.9639. Epub 2019 Mar 22.
A method has been developed based on a three-phase system, followed by dispersive liquid-liquid microextraction for the extraction of seven pesticides from soya milk prior to analysis by gas chromatography-flame ionization detection. The base of this method is the different extraction capability of the components of soya milk according to each of the phases involved. In this procedure, a homogeneous solution consisting of soya milk and a water-miscible solvent (acetonitrile) is separated into two phases in the presence of Na SO and the analytes are extracted into the produced acetonitrile droplets. The acetonitrile phase is mixed with a pre-concentration solvent to perform the next microextraction procedure for further enrichment of the analytes.
Limits of detection and quantification were reached in the ranges of 0.11-0.35 and 0.35-1.20 µg L , respectively. Enrichment factors and extraction recoveries were in the ranges of 562-933 and 56-93%, respectively. Relative standard deviations were ≤7% for intra- (n = 6) and inter-day (n = 5) precisions at two concentrations of 10 and 50 µg L of each analyte.
The proposed method was applied to the analysis of pesticides in soya milk samples at µg L concentrations. © 2019 Society of Chemical Industry.
本研究建立了一种基于三相体系的方法，随后采用分散液液微萃取法对豆奶中的七种农药进行萃取，最后用气相色谱-火焰离子化检测法进行分析。该方法的基础是根据各相的不同萃取能力来分离豆奶中的成分。在该程序中，在 Na SO 的存在下，将由豆奶和水溶性溶剂（乙腈）组成的均相溶液分离成两相，所分析的物质被萃取到生成的乙腈液滴中。乙腈相再与预浓缩溶剂混合，以进行下一步的微萃取程序，进一步富集分析物。
检测限和定量限分别达到 0.11-0.35 和 0.35-1.20 µg·L-1。富集因子和萃取回收率分别为 562-933 和 56-93%。在两个浓度 10 和 50 µg·L-1 的每种分析物下，日内（n=6）和日间（n=5）精密度的相对标准偏差均≤7%。
该方法已应用于 µg·L-1 浓度的豆奶样品中农药的分析。 © 2019 化学工业协会。
