Determination of Iodine in Food by Gold Nanoparticles Modified Electrode Cyclic Voltammetry

CHEN Linlin; FAN Tianjiao; LI Wei; ZHENG Fengming; YANG Xiyao; ZHANG Jiaxin; XIN Jiaying

doi:10.13386/j.issn1002-0306.2021030386

Volume 43 Issue 1

Dec. 2021

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Science and Technology of Food Industry > 2022 > 43(1): 288-294. > DOI: 10.13386/j.issn1002-0306.2021030386

CHEN Linlin, FAN Tianjiao, LI Wei, et al. Determination of Iodine in Food by Gold Nanoparticles Modified Electrode Cyclic Voltammetry[J]. Science and Technology of Food Industry, 2022, 43(1): 288−294. (in Chinese with English abstract). doi: 10.13386/j.issn1002-0306.2021030386.

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Determination of Iodine in Food by Gold Nanoparticles Modified Electrode Cyclic Voltammetry

1.
College of Food Engineering, Harbin University of Commerce, Harbin 150028, China
2.
State Key Laboratory of Oxo Synthesis & Selective Oxidation Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China

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Received Date: March 30, 2021
Available Online: November 05, 2021

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Abstract

Abstract

In order to find a rapid, simple and sensitive method for determination of iodine in food, a gold nanoparticle modified electrode was constructed by cyclic voltammetry (CV) to detect iodine ion (I^-). In situ reduction of gold nanoparticles (Mb@AuNPs) using methanobactin (Mb), and the self-assembled modified electrode was preparaed by electrodeposition. Mb@AuNPs was characterized by transmission electron microscope (TEM), the electrochemical behavior of iodine ion (I^-) was investigated by CV. The optimized conditions for iodine ion detection were as follows: Electrodeposition scanning rate 0.11 V/s, number of scanning cycles 30, buffer concentration 0.05 mol/L, buffer pH 6.5. There was a good linear relationship between oxidation peak current and I^- concentration in the range of 0.01~10.00 μmol/L, R² was 0.9992. The detection limit was 2.88 nmol/L (S/N), and the quantitation limit was 9.60 nmol/L. The recoveries of iodine content in different foods were 96.22%~103.57%. The results show that the modified electrode has good precision, stability, reproducibility and anti-interference ability for the determination of I^-, which meets the requirements of the determination method and can be used for the determination of I^- in practical samples.
- methanobactin (Mb),
- gold nanoparticle (AuNPs),
- cyclic voltammetry,
- electrode,
- iodine ion,
- self-assemble

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