陕西科技大学 食品与生物工程学院,陕西 西安 710021
徐秦峰,博士,教授,研究方向:食品安全检测,E-mail:xuqinfeng@sust.edu.cn
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王芳,董菁,李艳妮等.基于核酸分子光开关的闭管可视化环介导等温扩增检测方法[J].分析测试学报,2022,41(04):646-651.
WANG Fang,DONG Jing,LI Yan-ni,et al.A Visualized Closed-tube Detection Method for Loop-mediated Isothermal Amplification Based on Nucleic Acid Molecular Light Switch[J].Journal of Instrumental Analysis,2022,41(04):646-651.
王芳,董菁,李艳妮等.基于核酸分子光开关的闭管可视化环介导等温扩增检测方法[J].分析测试学报,2022,41(04):646-651. DOI: 10.19969/j.fxcsxb.21123104.
WANG Fang,DONG Jing,LI Yan-ni,et al.A Visualized Closed-tube Detection Method for Loop-mediated Isothermal Amplification Based on Nucleic Acid Molecular Light Switch[J].Journal of Instrumental Analysis,2022,41(04):646-651. DOI: 10.19969/j.fxcsxb.21123104.
该研究采用核酸分子“光开关”[Ru(bpy),2,(dppz)],2+,作为环介导等温扩增(LAMP)荧光染料,建立了一种快速、直观的闭管可视化LAMP检测方法。为避免高浓度染料对LAMP反应造成的强烈抑制和开盖导致的气溶胶交叉污染,该文采用蜡封反应管进行检测,通过直接观察扩增产物DNA与[Ru(bpy),2,(dppz)],2+,结合后产生的强烈红色荧光信号判定结果。该方法对金黄色葡萄球菌DNA的检出限可低至20拷贝/反应。方法特异性强,整个可视化检测过程可在1 h内完成,有望广泛应用于环境检测、食品安全、临床诊断等领域的现场快速核酸检测。
Compared with polymerase chain reaction(PCR) nucleic acid amplification,loop-mediated isothermal amplification(LAMP) does not require thermal cycling instruments,which is more suitable for rapid on-site detection.However,the small Stoke′s shift of currently used organic fluorescent dye for visualized LAMP leads to insufficient color differentiation.In this study,the nucleic acid molecule“light switch”[Ru(bpy),2,(dppz)],2+, was exploited as a LAMP fluorescent dye to establish a rapid visualized closed-tube method for LAMP detection.Visualization detection requires a high concentration of dye,but its adding before amplification reaction will strongly inhibit LAMP reaction,while its adding after reaction by opening the lid will lead to a serious aerosol cross contamination.Therefore,wax was chosen to seal the[Ru(bpy),2,(dppz)],2+, at the bottom of the tube,and the LAMP amplification products were visually detected by using the strong red fluorescence emission of [Ru(bpy),2,(dppz)],2+, in the presence of double-strand DNA.The ,S.aureus, DNA could be detected as low as 20 copies/reaction with strong specificity,and the whole visual detection process could be completed within 1 h.It could be widely used for the rapid on-site nucleic acid detection in the fields of environmental detection,food safety and clinical diagnosis.
环介导等温扩增法(LAMP)[Ru(bpy)2(dppz)]2+可视化检测金黄色葡萄球菌
LAMP isothermal amplification[Ru(bpy)2(dppz)]2+visual detectionS. aureus
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