Combination of supramolecular solvent-based microextraction and ultrasound-assisted extraction for cadmium determination in flaxseed flour by thermospray flame furnace atomic absorption spectrometry

Leonardo Francisco Rafael Lemes; César Ricardo Teixeira Tarley

doi:10.1016/j.foodchem.2021.129695

Combination of supramolecular solvent-based microextraction and ultrasound-assisted extraction for cadmium determination in flaxseed flour by thermospray flame furnace atomic absorption spectrometry

Food Chem. 2021 Mar 27:357:129695. doi: 10.1016/j.foodchem.2021.129695. Online ahead of print.

Authors

Leonardo Francisco Rafael Lemes¹, César Ricardo Teixeira Tarley²

Affiliations

¹ Departamento de Química, Universidade Estadual de Londrina (UEL), Rod. Celso Garcia Cid, PR 445 Km 380, Campus Universitário, Londrina, PR CEP 86051-990, Brazil.
² Departamento de Química, Universidade Estadual de Londrina (UEL), Rod. Celso Garcia Cid, PR 445 Km 380, Campus Universitário, Londrina, PR CEP 86051-990, Brazil; Instituto Nacional de Ciência e Tecnologia (INCT) de Bioanalítica, Universidade Estadual de Campinas (UNICAMP), Instituto de Química, Departamento de Química Analítica, Cidade Universitária Zeferino Vaz s/n, Campinas, SP CEP 13083-970, Brazil. Electronic address: tarley@uel.br.

PMID: 33866245
DOI: 10.1016/j.foodchem.2021.129695

Abstract

This study describes the development of a new analytical method for cadmium determination in flaxseed flour based on ultrasound-assisted extraction combined with supramolecular preconcentration followed by thermospray flame furnace atomic absorption spectrometry. Cadmium from flaxseed flour was extracted by ultrasound-assisted radiation in acid medium (1.5 mol L^-1HNO₃) followed by liquid-liquid microextraction of the acid extractwith dodecanoic acid/THF supramolecular solvent using diethyl dithiophosphate as a chelating agent. The limit of detection and the analytical curve range were found to be 0.10 μg L^-1 and 0.35 to 20.0 μg L^-1, respectively. The cadmium concentration in the flaxseed flours was ranged from 0.11 ± 0.04 to 0.79 ± 0.03 µg g^-1. The proposed methodis considered simpler, faster, low-cost, and environmentally friendly compared to procedures currently used for the determination of cadmium based on acid digestion and using graphite furnace atomic absorption spectrometry and inductively coupled plasma mass spectrometry.

Keywords: Functional foods; Quality control; SUPRA; TS-FF-AAS.