A new strategy for RRS-based determination of phosphate with a bifunctional Fe3O4 magnetic nanoparticle surface molecularly imprinted polydopamine probe

Wenxin Wan; Jie Yang; Guiqing Wen; Aihui Liang; Zhiliang Jiang

doi:10.1039/d4ay00035h

A new strategy for RRS-based determination of phosphate with a bifunctional Fe₃O₄ magnetic nanoparticle surface molecularly imprinted polydopamine probe

Anal Methods. 2024 May 21. doi: 10.1039/d4ay00035h. Online ahead of print.

Authors

Wenxin Wan^{1

2

3}, Jie Yang^{1

2

3}, Guiqing Wen^{1

2

3}, Aihui Liang^{1

2

3}, Zhiliang Jiang^{1

2

3}

Affiliations

¹ Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), Ministry of Education, Guilin 541004, China, +86-773-3695162. zhx@mailbox.gxnu.edu.cn.
² Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin 541004, China.
³ Guangxi Key Laboratory of Environmental Processes and Remediation in Ecologically Fragile Regions, China.

PMID: 38770859
DOI: 10.1039/d4ay00035h

Abstract

In this paper, a magnetic nanoparticle surface molecularly imprinted polydopamine RRS probe Fe₃O₄@MIP was prepared using phosphomolybdic acid (PMo) as the template, Fe₃O₄ magnetic nanoparticles as the substrate and dopamine hydrochloride (PD) as the monomer and crosslinking agent for the determination of PO₄^3-. Under acidic conditions, phosphomolybdic acid is formed by the reaction of PO₄^3- with ammonium molybdate (MSA), which can be imprinted with the Fe₃O₄@MIP probe surface and reduced to phosphomolybdic blue (PMoB) by ascorbic acid (Aa). Strong resonance Rayleigh scattering energy transfer (RRS-ET) occurs between the probe and PMoB, resulting in a decrease in the RRS signal value. A new, simple and selective RRS method for the determination of PO₄^3- in water samples was developed. The linear range of this method is 1-22.5 μmol L^-1, and the detection limit (DL) is 0.49 μmol L^-1. Furthermore, the magnetic enrichment ability of Fe₃O₄@MIP is discussed. Experimental data show that even 0.2 μmol L^-1 of phosphate can be detected within a 20% error range.