Facultad de Química, Universidad de la República, General Flores 2124, Montevideo, Uruguay.
J Agric Food Chem. 2012 May 9;60(18):4440-8. doi: 10.1021/jf205293j. Epub 2012 Apr 19.
The results of an experiment to study the occurrence and distribution of pesticide residues during rice cropping and processing are reported. Four herbicides, nine fungicides, and two insecticides (azoxystrobin, byspiribac-sodium, carbendazim, clomazone, difenoconazole, epoxiconazole, isoprothiolane, kresoxim-methyl, propanil, quinclorac, tebuconazole, thiamethoxam, tricyclazole, trifloxystrobin, λ-cyhalotrin) were applied to an isolated rice-crop plot under controlled conditions, during the 2009-2010 cropping season in Uruguay. Paddy rice was harvested and industrially processed to brown rice, white rice, and rice bran, which were analyzed for pesticide residues using the original QuEChERS methodology and its citrate variation by LC-MS/MS and GC-MS. The distribution of pesticide residues was uneven among the different matrices. Ten different pesticide residues were found in paddy rice, seven in brown rice, and eight in rice bran. The highest concentrations were detected in paddy rice. These results provide information regarding the fate of pesticides in the rice food chain and its safety for consumers.
报告了一项研究在水稻种植和加工过程中农药残留的发生和分布的实验结果。在乌拉圭 2009-2010 种植季节，四种除草剂、九种杀菌剂和两种杀虫剂（唑菌酯、吡唑醚菌酯、苯菌灵、氯甲唑、氟环唑、咯菌腈、异丙噻菌胺、克菌丹、丙草胺、氰氟草酯、噻虫嗪、戊唑醇、三环唑、三氟苯唑、高效氯氟氰菊酯）被应用于一个隔离的水稻种植区，采用的是在受控条件下进行的。收获稻谷并进行工业加工得到糙米、精米和米糠，然后使用原始的 QuEChERS 方法及其柠檬酸盐变体，通过 LC-MS/MS 和 GC-MS 对这些样品进行农药残留分析。农药残留在不同基质之间的分布不均匀。在稻谷中发现了十种不同的农药残留，在糙米中发现了七种，在米糠中发现了八种。在稻谷中检测到的浓度最高。这些结果提供了有关农药在水稻食物链中的归宿及其对消费者安全的信息。
