A colorimetric and fluorescence dual-signal determination for iron (II) and H2O2 in food based on sulfur quantum dots

•The effects of iron (II) and H2O2 on fluorescence and color of SQDs were explored.•A new dual-mode (colorimetric and fluorometric) determination of iron (II) and H2O2 was established. A colorimetric and fluorescence dual-signal method based on sulfur quantum dots (SQDs) was established for determin...

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Bibliographic Details
Published in:Food chemistry 2022-01, Vol.366, p.130613-130613, Article 130613
Main Authors: Lu, Changfang, Wang, Yi, Xu, Bingyi, Zhang, Wei, Xie, Yue, Chen, Yinyin, Wang, Lizhi, Wang, Xianxiang
Format: Article
Language:English
Subjects:
Colorimetric
Dual signal
Fluorometric
H2O2
iron (II)
Sulfur quantum dots
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Summary:•The effects of iron (II) and H2O2 on fluorescence and color of SQDs were explored.•A new dual-mode (colorimetric and fluorometric) determination of iron (II) and H2O2 was established. A colorimetric and fluorescence dual-signal method based on sulfur quantum dots (SQDs) was established for determination of iron (II) (Fe2+) and H2O2 in foods. Due to the complexation of Fe2+ with SQD, Fe2+ can cause fluorescence quenching of SQDs, and the color of the mixed solution changed from light yellow to deep green. By use of Fenton reaction, H2O2 can restore the quenched fluorescence of SQDs, and the color of the mixture changed from green to colorless. The concentration of Fe2+ and H2O2 has a good linear relationship with the fluorescence intensity and absorbance in the range of 2.5–55 μM and 1.25–500 μM, and the detection limits were 1.41 μM and 0.54 μM, respectively. For determination of H2O2, the linear ranges were 1.17–1.97 mM and 0.867–1.50 mM, and the detection limits were 0.03 μM and 0.06 μM, respectively.
ISSN:0308-8146
1873-7072
DOI:10.1016/j.foodchem.2021.130613