Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7585295 | Food Chemistry | 2018 | 8 Pages |
Abstract
A switchable sensor based on N and S co-doped carbon dots (N,S-CDs) was developed to determine ascorbic acid (AA) content in common fruits via fluorescence quenching of N,S-CDs by Fe3+ (off) and recovery by AA (on). TEM showed that the particle size was 2.35-7.95â¯nm with an average diameter of 5.12â¯nm. XPS and FTIR confirmed the presence of -OH, -COOH and -NH2 on N,S-CDs surface. UV-vis and FTIR revealed that the coordination of -COOH and -NH2 on N,S-CDs surface with Fe3+ accounted for FL quenching, and the release of -NH2 from coordination complexes due to the reduction of Fe3+ by AA led to partly FL recovery. The sensor allowed detecting AA in the linear range of 10-200â¯Î¼mol/L with a LOD of 4.69â¯Î¼mol/L. AA contents in common fruits detected by the sensor were in good agreement with the reference method (Pâ¯>â¯0.05), indicating a practical fluorescent sensor for AA detection in common fruits.
Related Topics
Physical Sciences and Engineering
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Analytical Chemistry
Authors
Xueli Luo, Wengang Zhang, Yong Han, Xiumei Chen, Li Zhu, Wenzhi Tang, Jianlong Wang, Tianli Yue, Zhonghong Li,