Artigo Acesso aberto Revisado por pares

Electrochemical sensors based on sewage sludge–derived biochar for the analysis of anthocyanins in berry fruits

2022; Springer Science+Business Media; Volume: 414; Issue: 21 Linguagem: Inglês

10.1007/s00216-022-04062-y

ISSN

1618-2650

Autores

Patrick Severin Sfragano, Serena Laschi, Lapo Renai, Michelangelo Fichera, Massimo Del Bubba, Ilaria Palchetti,

Tópico(s)

Electrochemical sensors and biosensors

Resumo

The reutilization of waste and the reduction of the general environmental impact of every production are fundamental goals that must be achieved in the framework of a circular economy. Recycled carbon-rich materials may represent a promising alternative to other less-sustainable carbonaceous materials used in the production of electrochemical sensing platforms. Herein, we propose an innovative carbon paste electrode (CPE) composed of biochar derived from biological sludge obtained from municipal and industrial wastewater treatment plants. The physicochemical properties of the biochar after a chemical treatment with an acidic solution obtained from industrial by-products were investigated. The electrode surface characterization was carried out by analyzing common redox probes and multiple phenols bearing varying numbers of -OH and -OCH3 groups in their structure. Furthermore, the CPE was also tested on the evaluation of the phenolic fingerprints of Vaccinium myrtillus, Vaccinium uliginosum subsp. gaultherioides, and Fragaria × ananassa. Standard anthocyanin mixtures and extracts of the aforementioned fruits were analyzed to provide a phenolic characterization of real samples. The obtained results show that the sewage sludge-derived biochar can be a promising material for the development of electroanalytical sensors.

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