Abstract
We have developed a label-free fluorescence sensor for caffeic acid (CA) by the use of CdTe:Zn2+ quantum dots (CdTe:Zn2+ QDs) as an output signal. The principle of sensor is based on the fluorescence quenching and binding properties of Fe2+ toward QDs and CA, respectively. To provide a fluorescence turn-on mode for CA detection, Fe2+ is first mixed with QDs solution, leading to a low fluorescence emission. With the addition of CA, the fluorescence of QDs is recovered due to the strong binding interaction between CA and Fe2+. Thus, a QDs-based label-free fluorescence sensor, designed in a simple mix-and-detect format, is established for CA detection. This study demonstrated here not only offers simple, sensitive and non-enzymatic detection method for CA, but also brings to light a new application of QDs in the food analysis.
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