A novel gold nanosol SERS quantitative analysis method for trace Na+ based on carbon dot catalysis

Chongning Li; Haidong Wang; Yanghe Luo; Guiqing Wen; Zhiliang Jiang

doi:10.1016/j.foodchem.2019.03.032

A novel gold nanosol SERS quantitative analysis method for trace Na⁺ based on carbon dot catalysis

Food Chem. 2019 Aug 15:289:531-536. doi: 10.1016/j.foodchem.2019.03.032. Epub 2019 Mar 12.

Authors

Chongning Li¹, Haidong Wang², Yanghe Luo¹, Guiqing Wen³, Zhiliang Jiang⁴

Affiliations

¹ Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), Ministry of Education, Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin 541004, China; School of Food and Bioengineering, Hezhou University, Hezhou 542899, China.
² Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), Ministry of Education, Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin 541004, China.
³ Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), Ministry of Education, Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin 541004, China. Electronic address: gqwen@mailbox.gxnu.edu.cn.
⁴ Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), Ministry of Education, Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin 541004, China; School of Food and Bioengineering, Hezhou University, Hezhou 542899, China. Electronic address: zljiang@mailbox.gxnu.edu.cn.

PMID: 30955645
DOI: 10.1016/j.foodchem.2019.03.032

Abstract

The Ca-doped carbon dots (CD_Ca) exhibited strong catalysis of HAuCl₄-H₂O₂ reaction to produce gold nanoparticle (AuNP), using Vitoria blue 4R (VB4r) as molecular probe, it appeared a strong surface enhanced Raman scattering (SERS) peak at 1615 cm^-1 in the AuNP nanosol substrate. When catalyst CD_Ca increased, the SERS peak enhanced linearly owing to AuNPs increasing, that is, the AuNP concentration is linear to SERS signal. Potassium pyroantimonate (PA) ligand can adsorb on CD_Ca surface to inhibit the catalysis and cause the SERS peak decreasing. The analyte of Na⁺ reacts with PA to produce the stable precipitate of [Na₂(PA)] and free CD_Ca catalyst. The more Na⁺, the more CD_Ca released, and the stronger SERS signal due to more AuNP substrate. Accordingly, a SERS quantitative analysis method for Na⁺ was developed based on CD_Ca catalytic SERS reaction, with a linear range of 0.004-0.043 μmol/L, and a detection limit of 0.0019 μmol/L Na.

Keywords: Ca-doped carbon dots; Na(+); Nanocatalysis; Potassium pyroantimonate; SERS.

MeSH terms

Adsorption
Antimony / chemistry
Carbon / chemistry
Catalysis
Coloring Agents / chemistry
Drinking Water / analysis*
Gold / chemistry
Hydrogen Peroxide / chemistry
Limit of Detection
Metal Nanoparticles / chemistry*
Quantum Dots / chemistry*
Sodium / analysis*
Spectrum Analysis, Raman / instrumentation
Spectrum Analysis, Raman / methods*

Substances

Coloring Agents
Drinking Water
potassium antimonate
Carbon
Gold
Antimony
Sodium
Hydrogen Peroxide