Citation:
DU Zai-Hui, LI Xiang-Yang, TIAN Jing-Jing, TIAN Hong-Tao, XU Wen-Tao. Establishment and Application of Functional Nucleic Acid Biosensor for Detection of Mercury Ion[J]. Chinese Journal of Analytical Chemistry,
;2018, 46(6): 947-951.
doi:
10.11895/j.issn.0253-3820.171390
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Excessive mercury ions have negative effects on individual health. So, it is of great significance to develop a method for rapid, sensitive and specific detection of Hg2+. In this study, the method for detection of Hg2+ was developed based on specific T-Hg-T mismatche and G-quadruplex. The template sequence mainly included the recognition region which could combine with Hg2+ specifically, the rich G region which could form G-quadruplex, and the speacer 18 partition zone. The target sequence mainly included 5' ends combining area and 3' end T-rich region. Templates and targets could be combined and the elongation was triggered only in the presence of Hg2+. Furthermore, the G-rich sequences were stripped off the templates and could form a single-stranded structure, because Spacer 18 had partition function. The G-quadruplex was formed with the K+ and hemin, and catalyzed H2O2-2,2-azinobis (3-ethylbenzothiozoline)-6-sulfonic acid(ABTS) reaction with color variations. The detection could be done within 35 min, and the Hg2+ concentration exhibited a linear correlation with absorbance at 414 nm within range of 20-500 nmol/L, with a detection limit of 16.5 nmol/L (3σ). The recoveries of Hg2+ spiked in tap water were 98.5%-103.5%. The method exhibited the advantages such as simple operation, low cost and short time, and operation value in emergency treatment and real-time environmental detection.
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Keywords:
- Mercury ion,
- G-quadruplex,
- Spacer arm,
- Functional nucleic acid,
- Biosensor
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