A new difunctional liquid crystal nanosurface molecularly imprinted polyitaconic acid nanoprobe for SERS/RRS determination of ultratrace melamine

Chenguang Yi; Aihui Liang; Guiqing Wen; Zhiliang Jiang

doi:10.1016/j.foodchem.2023.137716

A new difunctional liquid crystal nanosurface molecularly imprinted polyitaconic acid nanoprobe for SERS/RRS determination of ultratrace melamine

Food Chem. 2024 Mar 15:436:137716. doi: 10.1016/j.foodchem.2023.137716. Epub 2023 Oct 11.

Authors

Chenguang Yi¹, Aihui Liang¹, Guiqing Wen¹, Zhiliang Jiang²

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: zljiang@mailbox.gxnu.edu.cn.

PMID: 37839117
DOI: 10.1016/j.foodchem.2023.137716

Abstract

In this paper, a new dimode scattering spectral method for rapid detection of ultratrace melamine (ML) in dairy products was established by coupling nanosurface molecular imprinting technology with nanocatalytic amplification reaction of liquid crystal particles. It was found that liquid crystal cholesteryl butyrate (CBU) nanosurface imprinted polymers (CBU@MIP) not only recognized ML but also catalyzed the nano indicator reaction of HAuCl₄-sodium formate to produce gold nanoparticles with surface-enhanced Raman scattering (SERS) and resonance Rayleigh scattering (RRS) effect. When ML was added, it specifically combined with CBU@MIP to form CBU@MIP-ML conjugates with strong catalytic activity, and SERS and RRS signals increased linearly with the detection limits of 0.0072 pmol/L and 0.093 pmol/L respectively. The method was applied to the determination of ML in dairy products and plastic tablewares with relative standard deviation (RSD) of 2.2-4.4 % and 1.6-4.7 %, and recovery of 95.4 %-108.3 % and 95.9-108.6 % respectively.

Keywords: Cholesterol butyrate; Liquid crystal nanosurface imprinted poly-itaconic acid nanoprobe; Melamine; Nanocatalytic amplification; RRS; SERS.

MeSH terms

Gold / chemistry
Liquid Crystals*
Metal Nanoparticles* / chemistry
Molecular Imprinting* / methods
Spectrum Analysis, Raman / methods

Substances

melamine
Gold