Determination of Dimethachlon in Tobacco by Time-resolved Fluorescence Immunoassay
文献类型: 外文期刊
第一作者: Liu Yuan
作者: Liu Yuan;Liu Rong-Rong;Liu Xian-Jin;Fang Dun-Huang;Song Cun-Man;Huovinen, Tuomas;Vehnianen, Markus;Lovgren, Timo
作者机构:
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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