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Determination of Dimethachlon in Tobacco by Time-resolved Fluorescence Immunoassay

文献类型: 外文期刊

作者: Liu Yuan 1 ; Liu Rong-Rong 1 ; Liu Xian-Jin 1 ; Fang Dun-Huang 2 ; Song Cun-Man 2 ; Huovinen, Tuomas 3 ; Vehnianen, Ma 1 ;

作者机构: 1.Jiangsu Acad Agr Sci, Inst Food Safety, Nanjing 210014, Jiangsu, Peoples R China

2.Yunnan Inst Tobacco, Yuxi 653100, Peoples R China

3.Univ Turku, Turku 20540, Finland

关键词: Dimethachlon;Time-resolved fluorescence immunoassay;Tobacco;Sample pretreatment

期刊名称:CHINESE JOURNAL OF ANALYTICAL CHEMISTRY ( 影响因子:1.134; 五年影响因子:0.909 )

ISSN: 0253-3820

年卷期: 2012 年 40 卷 7 期

页码:

收录情况: SCI

摘要: A sensitive time-resolved fluorescence immunoassay (TRFIA) with a cleanup-free pretreatment for dimethachlon in tobacco was developed. The competitive indirect TRFIA for dimethachlon was established by using goat anti-rabbit IgG conjugated with a Eu-N1 clelate as a tracer. The detection limit (I-10) and I-50 for this assay was 1.98 mu g/L and 32.00 mu g/L, respectively. And the linear range for detection is between 3.97-128.76 mu g/L. Meanwhile, the effect of tobacco matrix to TRFIA was also studied. It was demonstrated that the linear range of inhibition curve with 1% tobacco matrix was parallel to the standard curve; so the extract of tobacco would be diluted 100 times before assay, the index of matrix interference (I-m) was calculated as 17.1. Three levels of dimethachon (1, 7 and 24 mg/L) were spiked into tobacco, the overall recoveries and the relative standard deviations (RSDs) were in the range of 73%-128% and 4.3-13.2, and the practical detection limit for the method was 1 mg/L. This assay is a suitable tool for screening dimethachlon residue in tobacco samples

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