Journal
CARBOHYDRATE POLYMERS
Volume 230, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2019.115679
Keywords
Carboxymethylcellulose; Starch; Anthocyanins; Black rice; Colorimetric sensor; Aluminum
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Funding
- Fundacao de Amparo a Pesquisa do Estado de Minas Gerais (FAPEMIG) [TEC-APQ-01305-15, CEX-APQ-00540-17]
- Universidade Federal de Ouro Preto [23109.003517/2018-85, 23109.003267/2017-01]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES) [001]
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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).
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