Colorimetric determination of mercury(II) ion based on DNA-assisted amalgamation: a comparison study on gold, silver and
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ORIGINAL PAPER
Colorimetric determination of mercury(II) ion based on DNA-assisted amalgamation: a comparison study on gold, silver and Ag@Au Nanoplates Yao Zhang 1 & Lan Zhang 1 & Luyang Wang 1 & Guoqing Wang 1,2
&
Makoto Komiyama 1 & Xingguo Liang 1,2
Received: 17 May 2019 / Accepted: 26 September 2019 # Springer-Verlag GmbH Austria, part of Springer Nature 2019
Abstract Inspired by the increasing use of plasmonic gold and silver nanoplates as probes for diverse analytes, the research community often questions which metal nanoplates should be chosen for a given application. A comparative study was performed on the performance and physicochemical properties of three types of metal nanoplates for use in plasmonic detection of Hg(II) ion. Specifically, gold, silver and Ag@Au nanoplates were studied. The established amalgamation method integrated into a detection scheme using nanoplates affords a unique yet straightforward signaling and extraction route for selective recognition of Hg(II) ion. Upon transformation of Hg(II) ion to metallic mercury, nanoplate amalgamation takes place instantly. This reshapes both the morphology and the optical characteristics of nanoplates. It is found that gold and Ag@Au nanoplates enable highly selective quantitation of Hg(II) ion by using a DNA oligomer consisting of poly-deoxycytidine (poly(C)) as a masking agent against Ag(I) ion. The silver nanoplates, in turn, display the best sensitivity owing to the chemical instability. The induced surface plasmonic shifts (of up to 250 nm and color changes from red to green) allows for determination of Hg(II) over a wide range and with a limit of detection of ~10 nM. It is recommended that the gold and Ag@Au nanoplates are used in relatively complex systems, while silver nanoplates are suited for simple matrices. Keywords Metal nanoplates . Localized surface plasmon resonance . Plasmonic shift . Silver(I) ion . Poly-deoxycytidine . Masking agent . Real sample analysis
Introduction Mercury (II) is a widespread pollutant of high toxicity [1, 2]. In addition to the possibility of Hg(II) intake from underground water, more severely, Hg(II) species in the food source Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00604-019-3873-z) contains supplementary material, which is available to authorized users. * Guoqing Wang [email protected] * Xingguo Liang [email protected] 1
College of Food Science and Engineering, Ocean University of China, 5 Yushan Road, Qingdao 266003, China
2
Laboratory for Marine Drugs and Bioproducts, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
can be progressively bioaccumulated via the food chain [3]. The resulting Hg(II) poisoning is associated with damage of central nervous system, as illustrated in the inspection of Minamata disease conducted from 1950s to recent years [4]. Up to date, people have engaged in development of various methods for detecting trace amount of aqueous Hg(II) ion, including atomic absorption/em
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