Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 848, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2019.113308
Keywords
Electrochemical aptasensor; T-Hg2+-T; Au@HS-rGO; Thionine
Categories
Funding
- National Natural Science Foundation of China [21575050, 21775053, 21777056]
- National Key Scientific Instrument and Equipment Development Project of China [21627809]
- Natural Science Foundation of Shandong Province [ZR2017MB027]
- Special Foundation for Taishan Scholar Professorship of Shandong Province [ts20130937]
- UJN
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A sensitive electrochemical aptasensor was prepared on the basis of gold modified thiol reduced graphene (Au@HS-rGO) and thymine-Hg2+-thymine (T-Hg2+-T) constitution for the checkout of Hg2+. Firstly, Au@HS-rGO was fabricated as the substrate onto the glassy carbon electrode (GCE) surface, which facilitated the subsequent introduction of single-stranded DNA onto the electrode. Following that, thionine (Th) was immobilized on the electrode surface depend on the physical size effect of T and Hg2+. Finally, the amount of Hg2+ was determined by differential pulse voltammetry (DPV) of Th. Under the best conditions, the linear range of the aptasensor to Hg2+ was in the range of 1-200 nmol/L and the detection limit was as low as 0.38 nmol/L. Simultaneously, good selectivity and acceptable reproducibility were revealed in the designed aptasensor. Moreover, the design thought may provide an idea for the detection of other substances in the water sample.
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