期刊
TALANTA
卷 84, 期 2, 页码 324-329出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2011.01.016
关键词
Aptamer; Polythymine; Polyguanine; Mercury(II); Lead(II)
资金
- National Science Council of Taiwan [NSC 98-2113-M-002-011-MY3]
We have developed a fluorescence technique for the detection of Hg2+ and Pb2+ ions using polythymine (T-33)/benzothiazolium-4-quinolinium dimer derivative (TOTO-3) and polyguanine (G(33))/terbium ions (Tb3+) conjugates. respectively. Hg2+ ions induce T-33 to form folded structures, leading to increased fluorescence of the T-33/TOTO-3 conjugates. Because Pb2+ ions compete with Tb3+ ions to form complexes with G(33), the extent of formation of the G(33)-Tb3+ complexes decreases upon increasing the Pb2+ concentration, leading to decreased fluorescence at 545 nm when excited at 290 nm. To minimize interference from Hg2+ ions during the detection of Pb2+ ions, we conducted two-step fluorescence measurements; prior to addition of the G(33)/Tb3+ probe, we recorded the fluorescence of a mixture of the T-33/TOTO-3 conjugates and He. ions. The fluorescence signal obtained was linear with respect to the Hg2+ concentration over the range 25.0-500 nM (R-2 = 0.99); for Pb2+ ions, it was linear over the range 3.0-50 nM (R-2 = 0.98). The limits of detection (at a signal-to-noise ratio of 3) for Hg2+ and Pb2+ ions were 10.0 and 1.0 nM, respectively. Relative to other techniques for the detection of Hg2+ and Pb2+ ions in soil and water samples, our present approach is simpler, faster, and more cost-effective. (C) 2011 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据