A simple and economical ultrasound-assisted method for Cd and Pb extraction from fruits and vegetables for food safety assurance

Dublin Core

Título

A simple and economical ultrasound-assisted method for Cd and Pb extraction from fruits and vegetables for food safety assurance

Tema

ALIMENTOS
SEGURIDAD ALIMENTICIA
ULTRASONIDO-EXTRACCION ASISTIDA
MICROSCOPIA OPTICA CONFOCAL
BIBLIOGRAFIA NACIONAL QUIMICA
2020

Abstract

Ultrasound‐assisted extraction (UAE) methods for food analysis are recognized as being in accordance with the principles of green analytical chemistry (GAC). Reference standard methods generally use microwave‐assisted extraction (MAE) for sample digestion; however, the use of ultrasonication processes has many advantages. Herein, a simple, and economical method for the determination of Cd and Pb in fruits and vegetables for food safety monitoring is reported. This method was optimized using a standard reference material (SRM, spinach leaves) through a multivariate experimental design (optimal conditions: 0.5 g of sample, 15 min of sonication, and 20.00 mL of 2.5 mol L−1 HNO3) and subsequently validated. The limits of detection obtained were one or two orders of magnitude lower than those achieved with MAE, making this a promising technique for contaminants monitoring. The UAE method was then tested on vegetable samples (apples, carrots, tomatoes, and lettuce) obtained from commercial sources in Uruguay and a comparison was made with samples treated by MAE. Both processes yielded comparable results, and the levels of Cd and Pb in all samples were below the maximum allowed concentration (MAC) established by the World Health Organization (WHO). In addition, to provide insight into the mechanism by which the ultrasonic process aids extraction, confocal optical images of the surface of the SRM were obtained. The leaves were examined after treatment at different sonication times (5–20 min). The confocal microscopy images show the effects of the ultrasonic treatment on the plant tissue, including desaturation, erosion, and abrasion, which increased with increasing sonication time. In conclusion, the UAE method meets and overcome the requirements of a standard method for food safety assurance.

Autor

Pereira, Mónica
Tissot, Florencia
Faccio, Ricardo
Ibañez, Facundo
Pistón, Mariela

Fuente

Results in Chemistry v. 3 , 2021. -- p. 1-7. -- e100089

Editor

Elsevier

Fecha

2021

Derechos

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Formato

Pdf

Idioma

Inglés

Tipo

Artículo

Identificador

https://doi.org/10.1016/j.rechem.2020.100089

Document Item Type Metadata

Original Format

Pdf
Fecha de agregación
June 27, 2021
Colección
Bibliografía Nacional Química
Tipo de Elemento
Document
Etiquetas
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Citación
Pereira, Mónica, “A simple and economical ultrasound-assisted method for Cd and Pb extraction from fruits and vegetables for food safety assurance,” RIQUIM - Repositorio Institucional de la Facultad de Química - UdelaR, accessed June 29, 2022, http://riquim.fq.edu.uy/items/show/6268.
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