食品科学

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利用无标记分子信标及核酸染料TOTO-3检测转基因食品

向东山   

  1. 生物资源保护与利用湖北省重点实验室,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
  • 基金资助:

    国家自然科学基金地区科学基金项目(21465010);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);湖北民族学院团队项目(MY2013T003);
    湖北省林学一级学科资助项目

Detection of Genetically Modified Food with a Non-Labeled Molecular Beacon and a Nucleic Acid Dye TOTO-3

XIANG Dongshan   

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

摘要:

利用无标记的分子信标,结合核酸染料TOTO-3,采用同步荧光分析法,建立一种高灵敏、高选择性的花椰菜花叶病毒CaMV 35S启动子核酸片段(目标DNA)的定量检测方法。在优化条件下,目标DNA浓度为2×10-10~200×10-10 mol/L之间时,TOTO-3的荧光强度(ΔI)与目标DNA浓度(C)之间具有良好的线性关系,其拟合的回归方程为Δ I = 2.022 2 C+18.411 1。方法检出限(3σ)为1×10-10 mol/L。该方法重复性好、灵敏度高、选择性好、检出限低。利用该方法,结合不对称聚合酶链式反应技术,实现了对转基因食品的检测。

关键词: 无标记分子信标, TOTO-3, 荧光, 转基因食品, 检测

Abstract:

A highly sensitive and selective detection method for DNA of cauliflower mosaic virus (CaMV) 35S promoter
(target DNA) was developed using a non-labeled molecular beacon (MB) and a nucleic acid dye TOTO-3. Under the
optimum conditions, the fluorescence intensity of TOTO-3 exhibited good linear dependence on the quantity of the target
DNA in the range of 2×10-10–200×10-10 mol/L. The fitted regression equation was Δ I = 2.022 2 C + 18.411 1, and the limit
of detection was 1 ×10-10 mol/L (3σ). The proposed method had a good precision, low detection limit, good selection and
high sensitivity. The detection of genetically modified food could be achieved by this proposed method based on asymmetric
polymerase chain reaction (PCR).

Key words: non-labeled molecular beacons, TOTO-3, fluorescence, genetically modified food, detection

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