DNA-Mediated Graphene Oxide/Platinum Nanozymes for Label-Free Colorimetric Detection of Hg2+
Source abstract
Abstract
Mercury ions (Hg 2+ ) have persistent bioaccumulation and high toxicity, which can severely damage the ecological system and human health. Therefore, sensitive methods are required for Hg 2+ analysis. Herein, a DNA-mediated growth strategy was developed for the synthesis of platinum nanoparticles (PtNPs) on the surface of graphene oxide (GO). The resulting GO-DNA-PtNPs displayed excellent peroxidase-mimicking activity in a sequence-dependent manner. The peroxidase-mimicking activity could be significantly inhibited by Hg 2+ because of the specific trapping of Hg 2+ by thymine bases (T–Hg 2+ –T) and in situ reduction of Hg 2+ by PtNPs on the GO surface. Under optimal conditions, there was a good linear range from 1 pM to 1 μM with a detection limit of 2.2 pM for Hg 2+ analysis. This sensor demonstrated excellent analytical performance for assessing Hg 2+ in complex lake waters. This work provides an effective strategy for the preparation of PtNP-based nanozymes and broadens the applications of PtNPs for biosensing.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Advanced biosensing and bioanalysis techniques · Advanced Nanomaterials in Catalysis · Nanocluster Synthesis and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
National R&D Center for Se-rich Agricultural Products Processing, School of Modern Industry for Selenium Science and Engineering, Wuhan Polytechnic University, Wuhan 430023, China
Ankang R&D Center for Se-enriched Products, Key Laboratory of Se-enriched Products Development and Quality Control, Ministry of Agriculture and Rural Affairs, Ankang, Shaanxi 725000, China
Key Laboratory for Deep Processing of Major Grain and Oil, Ministry of Education, Hubei Key Laboratory for Processing and Transformation of Agricultural Products, Wuhan Polytechnic University, Wuhan 430023, China
Funding
Wuhan Polytechnic University · Ministry of Agriculture and Rural Affairs of the People's Republic of China
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