A new gold nanoflower sol SERS method for trace iodine ion based on catalytic amplification

Faxin Yu; Hanbing Huang; Jinling Shi; Aihui Liang; Zhiliang Jiang

doi:10.1016/j.saa.2021.119738

A new gold nanoflower sol SERS method for trace iodine ion based on catalytic amplification

Spectrochim Acta A Mol Biomol Spectrosc. 2021 Jul 5:255:119738. doi: 10.1016/j.saa.2021.119738. Epub 2021 Mar 23.

Authors

Faxin Yu¹, Hanbing Huang¹, Jinling Shi¹, Aihui Liang², Zhiliang Jiang³

Affiliations

¹ Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), Ministry of Education, Guilin 541004, China; Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin 541004, China.
² Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), Ministry of Education, Guilin 541004, China; Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin 541004, China. Electronic address: ahliang2008@163.com.
³ Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), Ministry of Education, Guilin 541004, China; Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin 541004, China. Electronic address: zljiang@mailbox.gxnu.edu.cn.

PMID: 33812234
DOI: 10.1016/j.saa.2021.119738

Abstract

As one of the essential trace elements in metabolism, iodine is crucial to maintain the normal physiological functions. Therefore, based on health and environmental protection, it is very important to realize sensitive detection of iodide ion. Herein, we developed a simple, rapid and sensitive method for the determination of iodide ion. Trypsin was used as an ideal template for the synthesis of gold nanoflower sol (AuNFs) with anisotropic surface structure and good stability. It exhibits highly active surface enhanced Raman scattering (SERS) effect and can be used as facile SERS sol substrate. The TMBox generated by the catalytic oxidation reaction of TMB-chloramine T-iodide ion is used as the SERS probe. The enhanced SERS signal intensity is linearly related to the iodide ion with high sensitivity. In addition, TMB has fluorescence effect, and the colored TMBox can produce RRS signal due to polymerization. Based on this, a quad-mode detection method of SERS, RRS, fluorescence and colorimetry for quantitative detection of trace iodide ions was established, and this method can be applied to the detection of iodide ions in natural water and drinking water.

Keywords: Gold nanoflowers; Iodine ion; SERS quantitative analysis; TMBox probe.