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A method for sensitive detection of nitrite is presented. It is found that the red fluorescence of gold nanoclusters (with excitation/emission maxima at 365/635 nm) is quenched by traces of iodine via etching. Free iodide is formed by oxidation of iodide by bromate anion under the catalytic effect of nitrite. This catalytic process provides a sensitive means for nitrite detection. Under the optimal...
In this report, a sensitive fluorescent detection of ascorbic acid was developed with protein-stabilized gold nanoclusters. The fluorescence signal from the gold nanoclusters could be effectively quenched by elemental iodine. This kind of quenching could be inhibited by ascorbic acid through a corresponding reduction process, thus a turn-on response toward ascorbic acid was obtained. The validity...
We describe a simple method for non-titrimetric determination of oxidative species capable of oxidizing iodide to form free iodine. The combined action of iodine and excess iodide leads to the etching of gold nanoclusters stabilized with serum albumin. The extent of fluorescence quenching represents a direct signal for the amount of oxidative analytes. Compared to classical iodometry, tedious titration...
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