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黎媛萍,曾光明,汤琳,章毅,陈耀宁,黄国和.间接竞争ELISA法测定稻田土壤中除草剂毒莠定的残留量[J].环境科学学报,2007,27(7):1222-1226
间接竞争ELISA法测定稻田土壤中除草剂毒莠定的残留量
- Development of indirect ELISA for the determination of herbicide picloram residue in paddy soils
- 基金项目:国家重点基础研究“973”发展计划项目(No.2005CB724203);国家高技术研究发展计划(863)项目(No.2004AA649370);国家自然科学基金青年科学基金项目(No.50608029)
- 黎媛萍
- 湖南大学环境科学与工程学院, 长沙 410082
- 曾光明
- 湖南大学环境科学与工程学院, 长沙 410082
- 汤琳
- 湖南大学环境科学与工程学院, 长沙 410082
- 章毅
- 湖南大学环境科学与工程学院, 长沙 410082
- 陈耀宁
- 湖南大学环境科学与工程学院, 长沙 410082
- 黄国和
- 湖南大学环境科学与工程学院, 长沙 410082
- 摘要:通过对反应体系中酶标二抗(辣根过氧化物酶标记羊抗兔IgG)和抗体的最佳稀释浓度等条件的筛选和确定,最终建立了一种快速灵敏地测定污染稻田土壤中毒莠定残留量的方法——间接竞争ELISA分析方法.结果表明,酶标二抗和抗体的最佳稀释度均为1:500(体积比),毒莠定的检出下限达到5ng·mL-1,在0.07~0.7μg·mL-1浓度范围内有良好的线性;土壤浸出液加样的平均回收率为104.11%,变异系数在3.13%~11.13%之间,符合农药残留分析的要求;样品基质对检测结果没有干扰.
- Abstract:After optimizing the concentrations of the goat-anti-rabbit IgGlabeled by HRPand polyclonal rabbit-anti-picloram antibodies (PAb), a rapid and sensitive indirect competitive ELISAwas established for quantification of herbicide picloram in contaminated paddy soil samples. The results showed that the optimal dilution ratio of PAb and the goat-anti-rabbit IgGwere both 1: 500. The detection limit for picloram by this method (LOD) was 5 ng·mL-1, and the linear detection range was 0.07~0.7 μg·mL-1. In the recovery assay in paddy soil extract samples, the average recovery rate was 104.11%, and the coefficients of variation were between 3.13%~11.13%, which met the requirements of pesticide residue analysis. No significant interference from the soil matrix was observed.
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