A fast, low-cost, sensitive, selective, and non-laborious method based on functionalized magnetic nanoparticles, magnetic solid-phase extraction, and fluorescent carbon dots for the fluorimetric determination of copper in wines without prior sample treatment

被引：10

作者：

Costa, Matheus H. ^{[1
]}

Ferreira, Danilo T. S. ^{[1
]}

Padua, Jonathan E. S. ^{[1
]}

Fernandes, Julys P. A. ^{[1
]}

Santos, Josue Carinhanha C. ^{[2
]}

Cunha, Francisco Antonio S. ^{[2
]}

Araujo, Mario Cesar Ugulino ^{[1
]}

机构：

[1] Univ Fed Paraiba, Dept Quim, POB 5093, BR-58051970 Joao Pessoa, Paraiba, Brazil

[2] Univ Fed Alagoas, Inst Quim & Biotecnol, Campus AC Simoes,Tabuleiro Martins, BR-57072900 Maceio, Alagoas, Brazil

来源：

FOOD CHEMISTRY | 2021年 / 363卷

关键词：

Magnetic  nanoparticles; Magnetic solid-phase extraction; Analytical sample  pretreatment; Fluorescent carbon dots; Red wines; Wine analysis; INDUCTIVELY-COUPLED PLASMA; TRACE CADMIUM; QUANTUM DOTS; WHITE WINES; METALS; SPECTROMETRY; SPECIATION; REMOVAL; CU;

D O I：

10.1016/j.foodchem.2021.130248

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

A new fluorimetric method for copper(II) determination in wines was developed combining functionalized magnetic nanoparticles (FMNP) and fluorescent carbon dots (FCD). To produce FMNP, Fe3O4 was coated with Al2O3 forming Fe3O4@Al2O3 core-shell magnetic nanoparticles and functionalized with PAN and SDS. FCD was synthesized from pineapple juice through hydrothermal carbonization. For copper determination, aliquots of wine, the FMNP dispersion, and Britton-Robinson buffer (pH = 4.0) were mixed under stirring to allow the adsorption of copper by FMNP. Cu-FMNP complex was attracted by a niobium magnet and, after discarding the non-magnetic material, the copper(II) ions were eluted with an FCD dispersion before fluorescence quenching measurements. The proposed method presented a linear range from 0.020 to 0.100 mg L-1 (r2 = 0.9953), RSD (intraday) < 3.0%, and recovery rates from 96 to 105 %. FMNP and FCD properties permitted extraction/preconcentration/determination of copper within 1 min with an enrichment factor of nine and without prior sample treatment.

引用

页数：8