Bulletin of the Korean Chemical Society · 2018 · 32 citations · 38 references
EngineeringMetal NanoparticlesSensitive Hg 2+Colorimetric DetectionBio-based NanomaterialsChemistryRedox BiologyChemical EngineeringBiosensing SystemsBioanalysisPeroxidase‐like ActivityChitosan–gold NanoparticlesAnalytical ChemistryBioimagingNanosensorCation SensingChemical SensorHg 2+BiochemistryChitosan‐gold NanoparticlesBiomolecular EngineeringBiomedical DiagnosticsMedicineBiomedical Applications
Hg 2+ is a serious environmental contaminant that can cause severe damage to the immune and nervous systems, and Hg 2+ monitoring is critical. Herein, we report a novel, simple, and sensitive Hg 2+ sensor based on the enhanced peroxidase‐like activity of chitosan–gold nanoparticles (CS‐AuNPs). The peroxidase‐like activity of the CS‐AuNPs can be markedly enhanced by Hg 2+ as seen by the deeper color and increased absorbance at 652 nm. This improved catalytic ability was used to develop a sensitive and selective colorimetric sensor for Hg 2+ detection. The limit of detection via the absorption spectra is as low as 0.02 μM. The mechanism underlying the enhanced catalytic ability is discussed. This approach is label‐free, simple, and offers detection with the naked eye. Thus, it has potential applications for the detection of Hg 2+ in environmental and food samples.
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Intrinsic peroxidase-like activity of ferromagnetic nanoparticles
Lizeng Gao, Jie Zhuang, Leng Nie et al. · Nature Nanotechnology · 2007 · 7K citations
Magnetism, Intrinsic Peroxidase-like Activity, Engineering +6