Journal
TALANTA
Volume 85, Issue 1, Pages 713-717Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2011.04.063
Keywords
G-quenching; Duplex-like structure; Mercury detection; Fluorescence sensor
Categories
Funding
- Special Found for Major State Basic Research of China (973 Project) [2011CB911002]
- National Natural Science Foundation of China [20935003, 21075116]
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In this work, a novel fluorescence biosensor was demonstrated for detection of Hg2+ ions with relatively high selectivity and sensitivity. The sensing scheme was based on G-quenching induced by Hg2+ ions. In the presence of Hg2+ ions, the single-stranded signal probe which has carboxylfluorescein (FAM) and guanine segment at its 5' and 3' ends, respectively, folded into duplex-like structure via the Hg2+-mediated coordination of T-Hg2+-T base pairs. It brought guannine segment close to the dye and caused a remarkable decrease of fluorescence signal. The sensor showed a sensitive response to Hg2+ ions in a concentration range from 0.5 to 10 mu M. and a detection limit of 0.5 nM was given. This homogeneous system required only a single-labeled oligonucleotide, operated by concise procedures, and possessed comparable sensitivity as previous approaches. Furthermore, the sensor exhibits a great perspective for future practical applications. (C) 2011 Elsevier B.V. All rights reserved.
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