Overview
Peng and colleagues synthesized methionine-capped gold nanoclusters (Au NCs, less than 2 nm) as a fluorescence-enhanced probe for Cd2+ detection. Cadmium displaces methionine from the Au NC surface, quenching fluorescence in a concentration-dependent manner. Gold nanoclusters are the analytical reagent; cadmium is the target analyte. The sensor was validated in spiked skim milk powder and drinking water at concentrations relevant to food safety monitoring.
Key numbers
LOD: 0.1 µg/L Cd2+. Working range: 0.5 to 3.0 µg/L in spiked skim milk powder. Recoveries in milk powder: 91.2 to 103.8%. LOD 12.25 nM as reported in the paper. Sensor selectivity against Ca, Mg, Fe, and other common ions demonstrated.
Implications for the wiki
This paper contributes to Gold as documentation of gold nanocluster-based sensing for trace cadmium in dairy food matrices. It also provides analytical method context for Cadmium. No food occurrence data for gold or cadmium as natural contaminants are provided.
Related evidence
Update history
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