A Highly Sensitive and Selective Fluorescent Probe Using MPA-InP/ZnS QDs for Detection of Trace Amounts of Cu2+ in Water

Detection of copper (II) ions (Cu2+) in water is important for preventing them from entering the human body to preserve human health. Here, a highly sensitive and selective fluorescence probe that uses mercaptopropionic acid (MPA)-capped InP/ZnS quantum dots (MPA-InP/ZnS QDs) was proposed for the de...

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Bibliographic Details
Published in:Foods 2021-11, Vol.10 (11), p.2777
Main Authors: Xu, Zeyu, Wang, Yizhong, Zhang, Jiaran, Shi, Ce, Yang, Xinting
Format: Article
Language:English
Subjects:
Alzheimer's disease
Copper
copper (II) ions
Fluorescence
Fluorescent indicators
Food science
Nanocrystals
Quantum dots
Scientific imaging
water
Water analysis
Water sampling
Zinc sulfide
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Summary:Detection of copper (II) ions (Cu2+) in water is important for preventing them from entering the human body to preserve human health. Here, a highly sensitive and selective fluorescence probe that uses mercaptopropionic acid (MPA)-capped InP/ZnS quantum dots (MPA-InP/ZnS QDs) was proposed for the detection of trace amounts of Cu2+ in water. The fluorescence of MPA-InP/ZnS QDs can be quenched significantly in the presence of Cu2+, and the fluorescence intensity shows excellent linearity when the concentration of Cu2+ varies from 0–1000 nM; this probe also exhibits an extremely low limit of detection of 0.22 nM. Furthermore, a possible fluorescence-quenching mechanism was proposed. The MPA-InP/ZnS QDs probes were further applied to the detection of trace Cu2+ in real water samples and drink samples, showing good feasibility.
ISSN:2304-8158
2304-8158
DOI:10.3390/foods10112777