Journal
LUMINESCENCE
Volume 34, Issue 2, Pages 243-248Publisher
WILEY
DOI: 10.1002/bio.3601
Keywords
copper nanoclusters; fluorescence; quinoline yellow; sensor; static quenching
Categories
Funding
- Department of Science and Technology (DST) [DST/INT/POL/P-24/2016]
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Fluorescence quenching behavior of artificial food colorant quinoline yellow (QY), on interaction with l-cysteine stabilized copper nanoclusters (l-Cys-CuNCs) is investigated in this work. For this purpose, l-cysteine stabilized CuNCs were synthesized and characterized using various analytical techniques. Results demonstrated that the synthesized probe (size similar to 2 nm) had very promising optical features such as bright blue fluorescence, significant quantum yield and excellent photostability. l-Cys-CuNCs can function as a fluorescence sensor by selectively sensing QY among other yellow colorants, giving a detection limit as low as 0.11 mu M. The developed sensor exhibited a linear concentration range from 5.50 to 0.20 mu M. The developed fluorescence assay was successfully applied for testing commercial samples, thereby making this sensing strategy significant for quality control of food stuffs.
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