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Food Chem. 2018 Aug 30;258:214-221. doi: 10.1016/j.foodchem.2018.03.032. Epub 2018 Mar 9.

N,S co-doped carbon dots based fluorescent "on-off-on" sensor for determination of ascorbic acid in common fruits.

Author information

1
College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, PR China.
2
College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, PR China; Laboratory of Quality & Safety Risk Assessment for Agro-products (YangLing), Ministry of Agriculture, Yangling, Shaanxi 712100, PR China; National Engineering Research Center of Agriculture Integration Test (Yangling), Yangling, Shaanxi 712100, PR China.
3
College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, PR China; Laboratory of Quality & Safety Risk Assessment for Agro-products (YangLing), Ministry of Agriculture, Yangling, Shaanxi 712100, PR China; National Engineering Research Center of Agriculture Integration Test (Yangling), Yangling, Shaanxi 712100, PR China. Electronic address: steveli@nwsuaf.edu.cn.

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 2.35-7.95 nm with an average diameter of 5.12 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 10-200 μmol/L with a LOD of 4.69 μmol/L. AA contents in common fruits detected by the sensor were in good agreement with the reference method (P > 0.05), indicating a practical fluorescent sensor for AA detection in common fruits.

KEYWORDS:

Ascorbic acid; Carbon dots; Fluorescence detection; Fruits; Nanosensor; Switchable sensor

PMID:
29655725
DOI:
10.1016/j.foodchem.2018.03.032
[Indexed for MEDLINE]

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