Anthocyanin immobilization in carboxymethylcellulose/starch films: A sustainable sensor for the detection of Al(III) ions in aqueous matrices

Heriveltom Morais da Silva; Aparecida Barbosa Mageste; Silvia Juliana Barros E Silva; Guilherme Max Dias Ferreira; Gabriel Max Dias Ferreira

doi:10.1016/j.carbpol.2019.115679

Anthocyanin immobilization in carboxymethylcellulose/starch films: A sustainable sensor for the detection of Al(III) ions in aqueous matrices

Carbohydr Polym. 2020 Feb 15:230:115679. doi: 10.1016/j.carbpol.2019.115679. Epub 2019 Nov 27.

Authors

Heriveltom Morais da Silva¹, Aparecida Barbosa Mageste¹, Silvia Juliana Barros E Silva¹, Guilherme Max Dias Ferreira², Gabriel Max Dias Ferreira³

Affiliations

¹ Laboratório de Físico-Química e Química Ambiental, Departamento de Química, Universidade Federal de Ouro Preto (UFOP), Campus Morro do Cruzeiro, CEP 35400-000, Ouro Preto, MG, Brazil.
² Departamento de Química, Universidade Federal de Lavras (UFLA), Campus Universitário, CEP 37200-000, Lavras, MG, Brazil.
³ Laboratório de Físico-Química e Química Ambiental, Departamento de Química, Universidade Federal de Ouro Preto (UFOP), Campus Morro do Cruzeiro, CEP 35400-000, Ouro Preto, MG, Brazil. Electronic address: gabriel.ferreira@ufop.edu.br.

PMID: 31887948
DOI: 10.1016/j.carbpol.2019.115679

Abstract

A robust and sustainable sensor for the detection of Al(III) ions in water was developed by immobilization of anthocyanin (AN) from black rice in a film formed by carboxymethylcellulose (CMC) and starch. Characterization of the films was performed using solubility, thickness, FTIR, and mechanical analysis. The film exhibited an irreversible color change from red to purple in response to the presence of Al(III). The best colorimetric response of the sensor was observed at pH 4.5 and a time of 60 min, achieving the detection of 3 mg L^-1 of Al(III). For concentrations higher than 5 mg L^-1, the sensor response time decreased to 20 min. The minimum Al(III) concentration detected with the naked eye was lower than the maximum permissible concentrations in aqueous effluents according to different legislations, indicating the potential of this study to develop sensors for the detection of Al(III).

Keywords: Aluminum; Anthocyanins; Black rice; Carboxymethylcellulose; Colorimetric sensor; Starch.