A Colorimetric Probe for Determination of Trace Pb(II) in Tea Based on Peroxidase-like Activity of Carbon Dots Co-doped with Copper and Iodine

被引：0
|
作者：
Cheng C. [1 ]
Yang D. [2 ]
Li H. [3 ]
Li Q. [2 ]
Yang Y. [2 ]
机构：
[1] Faculty of Food Science and Engineering, Kunming University of Science and Technology, Kunming
[2] Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming
[3] Institute of Agro-products Processing, Yunnan Academy of Agricultural Sciences, Kunming
来源：
Shipin Kexue/Food Science | 2021年 / 42卷 / 24期
关键词：
Carbon dots co-doped with copper and iodine; Colorimetric probe; Lead; Peroxidase mimic; Tea;
D O I：
10.7506/spkx1002-6630-20201214-170
中图分类号：
学科分类号：
摘要：
Based on the regulation of Pb(II) on the enzyme-like activity of carbon dots co-doped with copper and iodine(Cu, I-CDs), a novel, simple and sensitive colorimetric probe was established for the determination of Pb(II) in tea samples.The kinetic parameters of Cu, I-CD peroxidase-like activity were well fitted to the Michaelis-Menten equation. When it was adsorbed on the surface of Cu, I-CDs, Pb(II) could promote the oxidation of the substrate 3,3',5,5'-tetramethylbenzidine(TMB).The concentration of Pb(II) in the range of 0.27-27.02 mg/L showed a good linear relationship with the formation of oxidized TMB (oxTMB).The detection limit of the developed method was 34.3 μg/L, and the spiked recoveries for actual tea samples were in the range of 92.41%-101.85%.These figures of merit meet the requirements of the national standard GB 5009.12-2017.In conclusion, this method is simple, stable, and specific, and its detection limit is lower than the country's limit for Pb(II) content in foods. © 2021, China Food Publishing Company. All right reserved.
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页码：323 / 328
页数：5
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