Journal
TALANTA
Volume 89, Issue -, Pages 57-62Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2011.11.056
Keywords
Potassium ion; DNAzyme; Fluorescence aptasensor
Categories
Funding
- National Natural Science Foundation of China [20975037, 21075037]
- Hunan Provincial Science and Technology Departments [09JJ3019, 07JJ3024]
- Aid program for Science and Technology Innovative Research Team in Higher Educational Instituions of Hunan Province
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A novel label-free and sensitive fluorescent aptasensor for the detection of potassium ion (K+) was developed based on the horseradish peroxidase-mimicking DNAzyme (HRP-DNAzyme). In this work, we selected a K+-stabilized single stranded DNA (ssDNA) with G-rich sequence as the recognition element. In the presence of K+, the G-rich DNA folded into the G-quadruplex structure, and then hemin can bind to the G-quadruplex structure as a co-factor and form HRP-DNAzyme. 3-(p-Hydroxyphenyl)-propanoic acid (HPPA) can be oxidized by H2O2 into a fluorescent product in the presence of DNAzyme. The fluorescence intensity of the HPPA oxidative product increased with the K+ concentration. Under the optimal conditions, the fluorescence intensity was linearly related to the logarithm of K+ concentration in the range of 2.5 mu M to 5 mM. Other metal ions, such as Na+, Li+, NH4+, Mg2+ and Ca2+ caused no notable interference on the detection of K+. (C) 2011 Elsevier B.V. All rights reserved.
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