食品科学

• 安全检测 • 上一篇    下一篇

双色荧光定量检测大米中的汞

翟 琨1,2,王联芝2,向东山1,2,*   

  1. 1.湖北民族学院 生物资源保护与利用湖北省重点实验室,湖北 恩施 445000;
    2.湖北民族学院化学与环境工程学院,湖北 恩施 445000
  • 出版日期:2015-01-25 发布日期:2015-01-16
  • 通讯作者: 向东山
  • 基金资助:

    国家自然科学基金地区科学基金项目(21465010;31460172);湖北省教育厅重点项目(D20131905;D20131906);
    生物资源保护与利用湖北省重点实验室开放基金项目(PKLHB1316);湖北省林学一级学科资助项目

Dual Color Fluorescence Quantitative Detection of Mercury in Rice

ZHAI Kun1,2, WANG Lianzhi2,XIANG Dongshan1,2,*   

  1. 1. Key Laboratory of Biologic Resources Protection and Utilization of Hubei Province, Hubei Minzu University, Enshi 445000, China;
    2. School of Chemical and Environmental Engineering, Hubei Minzu University, Enshi 445000, China
  • Online:2015-01-25 Published:2015-01-16
  • Contact: XIANG Dongshan

摘要:

利用两条部分互补的富含胸腺嘧啶(T碱基)的单链核酸,结合氧化石墨烯及核酸染料SYBR GreenⅠ,采用同步荧光分析法,建立一种高灵敏度、高选择性的汞离子(Hg2+)双色荧光定量检测方法。在优化条件下,Hg2+浓度在5×10-10~500×10-10 mol/L之间时,SYBR GreenⅠ及Carboxy-X-rhodamine(ROX)总的荧光强度(ΔIT)与Hg2+浓度(C)之间具有良好的线性关系,其拟合的回归方程为ΔIT = 2.121 3C+10.536 0,方法检出限(3σ)为2×10-10 mol/L。该方法操作简单、检测速度快、选择性好、灵敏度高、重复性好、检出限低。将该方法应用于大米中汞的检测,获得了满意的结果。

关键词: 汞, 定量检测, 双色荧光, 大米

Abstract:

A highly sensitive and selective dual color fluorescence quantitative detection method for mercury (Hg2+) in rice
was developed by synchronous scanning fluorescence spectrometry. In this method, two complementary single-stranded
nucleic acids with T-T mismatches, SYBR GreenⅠ and graphene oxide were employed. Under the optimum conditions, the
total fluorescence intensity of SYBR GreenⅠ and carboxy-X-rhodamine (ROX) exhibited good linear dependence on the
quantity of Hg2+ in the range of 5 × 10-10–500 × 10-10 mol/L. The fitted regression equation was ΔIT = 2.121 3 C + 10.536 0
with a detection limit of 2 × 10-10 mol/L (3σ). The proposed method displayed a good precision, high selection, simple
operation, fast detection, low detection limit and high sensitivity. This method has been applied with satisfactory results.

Key words: mercury, quantitative detection, dual color fluorescence, rice

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