title: Self-powered sensor for trace Hg2+ detection.
abstract: A self-powered electrochemical sensor has been facilely designed for sensitive detection of Hg(2+) based on the inhibition of biocatalysis process of enzymatic biofuel cell (BFC) for the first time. The as-prepared one-compartment BFC, which was consisted of alcohol dehydrogenase supported on single-walled carbon nanohorns-based mediator system as the anode and bilirubin oxidase as the cathodic biocatalyst, generated an open circuit potential (V(oc)) of 636 mV and a maximum power density of 137 μW cm(-2). It was interestingly found that the presence of Hg(2+) would affect the performance of the constructed BFC (e.g., V(oc)). Taking advantage of the inhibitive effect of Hg(2+), a novel self-powered Hg(2+) sensor has been developed, which showed a linear range of 1-500 nM (R(2) = 0.999) with a detection limit of 1 nM at room temperature. In addition, this BFC-type sensor exhibited good selectivity for Hg(2+) against other common environmental metal ions, and the feasibility of the method for Hg(2+) detection in actual water samples (i.e., tap, ground, and lake water) was demonstrated with satisfactory results.
authors.affiliation: State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, China.
authors.forename: Dan
authors.initials: D
authors.lastname: Wen
authors.forename: Liu
authors.initials: L
authors.lastname: Deng
authors.forename: Shaojun
authors.initials: S
authors.lastname: Guo
authors.forename: Shaojun
authors.initials: S
authors.lastname: Dong
mesh_terms: D000426:Alcohol Dehydrogenase / Q000037:antagonists & inhibitors / Q000378:metabolism; D055162:Biocatalysis; D055664:Electrochemical Techniques / Q000379:methods*; D004566:Electrodes; D007477:Ions / Q000737:chemistry; D008628:Mercury / Q000032:analysis*; D037742:Nanotubes, Carbon / Q000737:chemistry; D044925:Oxidoreductases Acting on CH-CH Group Donors / Q000037:antagonists & inhibitors / Q000378:metabolism; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D007477:Ions; D037742:Nanotubes, Carbon; D014874:Water Pollutants, Chemical; D000426:Alcohol Dehydrogenase; D044925:Oxidoreductases Acting on CH-CH Group Donors; C042401:bilirubin oxidase; D008628:Mercury