Quercetin-coated Fe3O4 nanoparticle sensors based on low-field NMR for determination and removal of Pb2+ and Cu2+ in biological samples†,Analytical Methods

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Quercetin-coated Fe3O4 nanoparticle sensors based on low-field NMR for determination and removal of Pb2+ and Cu2+ in biological samples†
Analytical Methods ( IF 2.7 ) Pub Date : 2018-05-03 00:00:00 , DOI: 10.1039/c8ay00598b
Weina Jiang _{1,

2,

3} , Shilong Yang _{2,

3,

4,

5} , Xu Sun _{2,

3,

6} , Wen Lu _{2,

3,

5,

7} , Dong Jiang _{2,

3,

5,

7} , Li Xu _{2,

3,

4,

5,

7} , Haijun Xu _{1,

2,

3} , Buhong Gao _{2,

3,

4,

5} , Mengtao Ma _{2,

3,

5,

7} , Fuliang Cao _{2,

3,

8}

Affiliation

In this paper, we develop quercetin-coated Fe₃O₄ nanoparticles (QMNP_S) as a sensor for the detection and removal of Pb²⁺ and Cu²⁺ based on low-field NMR. QMNP_S were characterized by TEM, FTIR and XRD. The NMR sensor showed high selectivity toward Pb²⁺ or Cu²⁺. The standard curves for ΔT₂-ion concentration showed good correlations, i.e., R² = 0.9912 for Pb²⁺ and 0.9983 for Cu²⁺; the linear ranges and the limits of detection were 4.8 × 10⁻⁶–1 × 10⁻⁴ mol L⁻¹ and 1.6 × 10⁻⁶ mol L⁻¹ for Pb²⁺, and 5.0 × 10⁻⁶–1 × 10⁻⁴ mol L⁻¹ and 2.0 × 10⁻⁶ mol L⁻¹ for Cu²⁺, respectively. The calculated maximum adsorption capacity was about 71 mg for Cu²⁺ and 68 mg for Pb²⁺ per gram of QMMP, which was superior to the results of some previous reports. The detection and removal of Pb²⁺ or Cu²⁺ was based on the coordination reaction between the NMR sensor of QMNPs and Pb²⁺ or Cu²⁺, which led to the aggregation of QMNPs. As a result, the proposed NMR sensor was successfully applied for the determination and removal of Pb²⁺ and Cu²⁺ in contaminated water and urine samples with excellent recoveries and high adsorbent capacities.

中文翻译：

基于低场NMR的槲皮素涂层Fe ₃ O ₄纳米颗粒传感器，用于测定和去除生物样品中的Pb ²⁺和Cu 2 ⁺†

在本文中，我们开发了槲皮素涂层的Fe ₃ O ₄纳米颗粒（QMNP _S）作为一种传感器，用于基于低场NMR来检测和去除Pb ²⁺和Cu ²⁺。通过TEM，FTIR和XRD对QMNP _S进行了表征。NMR传感器显示出对Pb ²⁺或Cu ^2+的高选择性。为Δ标准曲线Ť ₂ -离子浓度下显示出良好的相关性，即，- [R ² = 0.9912对Pb ²⁺和0.9983对Cu ²⁺ ; 线性范围和检出限为4.8×10 ^-6 –1×10对于Pb²⁺为^-4 mol L^-1和1.6×10^-6 mol L^-1，对于Cu²为5.0×10^-6 -1×10^-4 mol L^-1和2.0×10^-6 mol L^-1⁺。每克QMMP对Cu^2+的最大吸附容量约为71 mg，对Pb^2+的最大吸附容量约为68 mg，这优于某些先前的报告的结果。Pb²⁺或Cu²⁺的检测和去除基于QMNPs的NMR传感器与Pb²⁺或Cu²⁺的配位反应，这导致了QMNP的聚集。结果，所提出的NMR传感器成功地用于测定和去除受污染的水和尿液样品中的Pb ²⁺和Cu ²⁺，具有优异的回收率和高吸附能力。

更新日期：2018-05-03

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