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Current Nanoscience

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ISSN (Print): 1573-4137
ISSN (Online): 1875-6786

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Research Article

A Magnetic Sensor Based on Poly(γ-Glutamic Acid)-Functionalized Iron Oxide Nanoparticles for Cr3+ Detection

Author(s): Zhibo Yu, Liang Jia, Jianzhi Zhu, Mingwu Shen, Jingchao Li*, Jinting Jiu, Maoquan Li and Xiangyang Shi*

Volume 18, Issue 2, 2022

Published on: 03 March, 2021

Page: [247 - 254] Pages: 8

DOI: 10.2174/1573413717666210303110620

Price: $65

Abstract

Background: The highly sensitive and selective detection of Cr3+ is critical.

Objective: We report the development of poly(γ-glutamic acid) (γ-PGA)-functionalized iron oxide nanoparticles (γ-PGA-Fe3O4 NPs) as a magnetic nanosensor for magnetic resonance (MR) detection of trivalent chromium (Cr3+) in aqueous solution.

Methods: The γ-PGA-Fe3O4 NPs with a mean particle size of 7.3 nm, good colloidal stability and ultrahigh r2 relaxivity (326.8 mM−1s−1) were synthesized via a facile mild reduction approach in the presence of γ-PGA, and used for MR detection of Cr3+.

Results: Upon exposure to Cr3+, the γ-PGA-Fe3O4 NPs aggregated into nanoclusters as verified by dynamic light scattering due to the coordination of Cr3+ with γ -PGA side-chain carboxyl groups, resulting in the decrease in their transverse relaxation time. This MR signal change enables detection of Cr3+ in a concentration range of 0.4-1 nM. We also show that the γ-PGA-Fe3O4 NPs have an excellent selectivity toward Cr3+ and a high recovery percentage of 83.8% or above.

Conclusion: This study thus demonstrates that the developed γ-PGA-Fe3O4 NPs may be used as a nanoprobe for MR sensing of Cr3+ in water environment.

Keywords: Nanosensor, magnetic resonance sensing, relaxivity, iron oxide nanoparticles, Cr3+ ions, poly(γ-glutamic acid).

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