期刊
MOLECULES
卷 26, 期 5, 页码 -出版社
MDPI
DOI: 10.3390/molecules26051246
关键词
fluorescent carbon dots; hydrothermal method; jujube; ascorbic acid
资金
- Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi Province [2019L0393]
- Shanxi Province Applied Basic Research Program Project [201901D211374]
- Shanxi Agricultural University Science and Technology Innovation Fund [2017YJ32, 2019029]
- Shanxi Provincial Key Research and Development Project [201903D211007-1]
- Shanxi Agricultural Valley Construction Scientific Research Special Project [SXNGJSKYZX201902]
- Shanxi Province Outstanding Doctor Coming to Jin Working on Rewarding Fund Scientific Research Project [SXYBKY201712, SXYBKY201734]
In this study, water-soluble fluorescent carbon dots were synthesized using a hydrothermal method and a CDs/Fe3+ composite was prepared for the determination of ascorbic acid content, showing good recognition and a linear relationship. Satisfactory results were achieved when this method was applied to the determination of ascorbic acid in jujube fruit.
Water-soluble fluorescent carbon dots (CDs) were synthesized by a hydrothermal method using citric acid as the carbon source and ethylenediamine as the nitrogen source. The repeated and scale-up synthetic experiments were carried out to explore the feasibility of macroscopic preparation of CDs. The CDs/Fe3+ composite was prepared by the interaction of the CDs solution and Fe3+ solution. The optical properties, pH dependence and stability behavior of CDs or the CDs/Fe3+ composite were studied by ultraviolet spectroscopy and fluorescence spectroscopy. Following the principles of fluorescence quenching after the addition of Fe3+ and then the fluorescence recovery after the addition of asorbic acid, the fluorescence intensity of the carbon dots was measured at lambda ex = 360 nm, lambda em = 460 nm. The content of ascorbic acid was calculated by quantitative analysis of the changing fluorescence intensity. The CDs/Fe3+ composite was applied to the determination of different active molecules, and it was found that the composite had specific recognition of ascorbic acid and showed an excellent linear relationship in 5.0-350.0 mu mol center dot L-1. Moreover, the detection limit was 3.11 mu mol center dot L-1. Satisfactory results were achieved when the method was applied to the ascorbic acid determination in jujube fruit. The fluorescent carbon dots composites prepared in this study may have broad application prospects in a rapid, sensitive and trace determination of ascorbic acid content during food processing.
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