基于分子信标及核酸染料SYBR Green Ⅰ定量检测土壤中的汞
利用分子信标、单链核酸（ss DNA）及核酸染料SYBR GreenⅠ,通过同步荧光分析法,建立了一种高灵敏、高选择性土壤汞（Hg2＋）的定量检测方法。在该体系中,分子信标的荧光基团设计为荧光胺（FAM）,分子信标的环设计为与ss DNA互补,但有4个T碱基错配的序列。在Hg2＋存在时,分子信标的环与ss DNA通过＂T-Hg2＋-T＂特异性结合形成双链DNA,分子信标的茎被打开,荧光基团与猝灭基团分开,荧光恢复;同时,核酸染料SYBR GreenⅠ与双链DNA作用,SYBR GreenⅠ的荧光信号显著增强。SYBR GreenⅠ与FAM的最大激发波长与最大发射波长都很接近,通过同步荧光分析法...
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| Published in | 分析化学 Vol. 43; no. 8; pp. 1125 - 1129 |
|---|---|
| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
湖北民族学院化学与环境工程学院,恩施445000%湖北民族学院化学与环境工程学院,恩施,445000%华中农业大学资源与环境学院,武汉,430070
2015
华中农业大学资源与环境学院,武汉430070 |
| Subjects | |
| Online Access | Get full text |
| ISSN | 0253-3820 |
| DOI | 10.11895/j.issn.0253-3820.150122 |
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| Abstract | 利用分子信标、单链核酸（ss DNA）及核酸染料SYBR GreenⅠ,通过同步荧光分析法,建立了一种高灵敏、高选择性土壤汞（Hg2＋）的定量检测方法。在该体系中,分子信标的荧光基团设计为荧光胺（FAM）,分子信标的环设计为与ss DNA互补,但有4个T碱基错配的序列。在Hg2＋存在时,分子信标的环与ss DNA通过＂T-Hg2＋-T＂特异性结合形成双链DNA,分子信标的茎被打开,荧光基团与猝灭基团分开,荧光恢复;同时,核酸染料SYBR GreenⅠ与双链DNA作用,SYBR GreenⅠ的荧光信号显著增强。SYBR GreenⅠ与FAM的最大激发波长与最大发射波长都很接近,通过同步荧光分析法检测时,两种荧光染料的荧光峰重叠,荧光信号增强,可实现Hg2＋的高灵敏检测。体系的最优检测条件为：缓冲溶液的p H=8.0,孵育温度为50℃,孵育4 min,缓冲溶液中Na Cl的浓度为30 mmol/L,SYBR Green I工作液的体积为100 0L。在优化条件下,Hg2＋浓度在5×10 10~4.0×10 8mol/L时,SYBR GreenⅠ及FAM总的荧光强度（ΔI,为体系在存在和不存在Hg2＋时的荧光强度之差）与Hg2＋浓度（C）间有良好的线性关系,其拟合的回归方程为ΔI=1.3949C＋19.3596（R2=0.9976）,方法检出限（3σ）为3×10 10mol/L。本方法操作简单、快速、选择性好、灵敏度高、重复性好。 |
|---|---|
| AbstractList | 利用分子信标、单链核酸(ssDNA)及核酸染料SYBR Green Ⅰ,通过同步荧光分析法,建立了一种高灵敏、高选择性土壤汞(Hg2+)的定量检测方法.在该体系中,分子信标的荧光基团设计为荧光胺(FAM),分子信标的环设计为与ssDNA互补,但有4个T碱基错配的序列.在Hg2+存在时,分子信标的环与ssDNA通过“T-Hg2+-T”特异性结合形成双链DNA,分子信标的茎被打开,荧光基团与猝灭基团分开,荧光恢复;同时,核酸染料SYBR Green Ⅰ与双链DNA作用,SYBR Green Ⅰ的荧光信号显著增强.SYBR Green Ⅰ与FAM的最大激发波长与最大发射波长都很接近,通过同步荧光分析法检测时,两种荧光染料的荧光峰重叠,荧光信号增强,可实现Hg2+的高灵敏检测.体系的最优检测条件为:缓冲溶液的pH=8.0,孵育温度为50℃,孵育4 min,缓冲溶液中NaCl的浓度为30 mmol/L,SYBR Green Ⅰ工作液的体积为100 μL.在优化条件下,Hg2+浓度在5×10-10～4.0×104 mol/L时,SYBR Green Ⅰ及FAM总的荧光强度(△I,为体系在存在和不存在Hg2+时的荧光强度之差)与Hg2+浓度(C)间有良好的线性关系,其拟合的回归方程为△I=1.3949C+ 19.3596(R2=0.9976),方法检出限(3σ)为3×10-10 mol/L.本方法操作简单、快速、选择性好、灵敏度高、重复性好. 利用分子信标、单链核酸（ss DNA）及核酸染料SYBR GreenⅠ,通过同步荧光分析法,建立了一种高灵敏、高选择性土壤汞（Hg2＋）的定量检测方法。在该体系中,分子信标的荧光基团设计为荧光胺（FAM）,分子信标的环设计为与ss DNA互补,但有4个T碱基错配的序列。在Hg2＋存在时,分子信标的环与ss DNA通过＂T-Hg2＋-T＂特异性结合形成双链DNA,分子信标的茎被打开,荧光基团与猝灭基团分开,荧光恢复;同时,核酸染料SYBR GreenⅠ与双链DNA作用,SYBR GreenⅠ的荧光信号显著增强。SYBR GreenⅠ与FAM的最大激发波长与最大发射波长都很接近,通过同步荧光分析法检测时,两种荧光染料的荧光峰重叠,荧光信号增强,可实现Hg2＋的高灵敏检测。体系的最优检测条件为：缓冲溶液的p H=8.0,孵育温度为50℃,孵育4 min,缓冲溶液中Na Cl的浓度为30 mmol/L,SYBR Green I工作液的体积为100 0L。在优化条件下,Hg2＋浓度在5×10 10~4.0×10 8mol/L时,SYBR GreenⅠ及FAM总的荧光强度（ΔI,为体系在存在和不存在Hg2＋时的荧光强度之差）与Hg2＋浓度（C）间有良好的线性关系,其拟合的回归方程为ΔI=1.3949C＋19.3596（R2=0.9976）,方法检出限（3σ）为3×10 10mol/L。本方法操作简单、快速、选择性好、灵敏度高、重复性好。 |
| Author | 翟琨 向东山 朱俊 胡红青 |
| AuthorAffiliation | 华中农业大学资源与环境学院,武汉430070 湖北民族学院化学与环境工程学院,恩施445000 |
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| Author_FL | ZHU Jun XIANG Dong-Shan ZHAI Kun HU Hong-Qing |
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| DocumentTitleAlternate | Highly Sensitive Fluorescence Quantitative Detection of Mercury in Soil Samples Based on Molecular Beacon and Nucleic Acid Dye SYBR Green I |
| DocumentTitle_FL | Highly Sensitive Fluorescence Quantitative Detection of Mercury in Soil Samples Based on Molecular Beacon and Nucleic Acid Dye SYBR Green |
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| Keywords | 定量检测 Nucleic acid dye SYBR Green Soil Molecular beacon 分子信标 Mercury 汞 Quantitative detection 核酸染料SYBR Green 土壤 |
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| Notes | 22-1125/O6 ZHAI Kun, XIANG Dong-Shan, ZHU Jun, HU Hong-Qing 1 （ College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China） 2 （ School of Chemical and Environmental Engineering, Hubei University for Nationalities, Enshi 445000, China） Mercury; Molecular beacon; Nucleic acid dye SYBR Green I; Quantitative detection; Soil A highly sensitive and selective fluorescence method for quantitative detection of mercury in soil was developed based on molecular beacon （ MB）, single-stranded nucleic acid （ssDNA） and nucleic acid dye SYBR Green I by synchronous fluorescence analysis. In this strategy, the fluorophore of MB was 6-carboxyfluorescein group （ FAM）, and the loop of MB was complementary to the ssDNA with four T-T mismatches. In the presence of Hg2＋, the MBs and ssDNA with T-T mismatches formed double-stranded DNA （dsDNA） via T-Hg2＋-T coordination structure, then the fluorophore FAM was separated from the quencher BHQ-1, thus emitted fluorescence. Meanwhile, SYBR Green I bound to dsD |
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| Publisher | 湖北民族学院化学与环境工程学院,恩施445000%湖北民族学院化学与环境工程学院,恩施,445000%华中农业大学资源与环境学院,武汉,430070 华中农业大学资源与环境学院,武汉430070 |
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| Snippet | 利用分子信标、单链核酸（ss DNA）及核酸染料SYBR GreenⅠ,通过同步荧光分析法,建立了一种高灵敏、高选择性土壤汞（Hg2＋）的定量检测方法。在该体系中,分子信标的荧光基团设... 利用分子信标、单链核酸(ssDNA)及核酸染料SYBR Green Ⅰ,通过同步荧光分析法,建立了一种高灵敏、高选择性土壤汞(Hg2+)的定量检测方法.在该体系中,分子信标的荧光基团设计为荧... |
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| Title | 基于分子信标及核酸染料SYBR Green Ⅰ定量检测土壤中的汞 |
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