Journal
ELECTROANALYSIS
Volume 31, Issue 11, Pages 2162-2170Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.201900176
Keywords
Bisphenol A; Carbon black; Casein Film; Electrochemistry; Sensor
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Funding
- FAPESP [2015/19099-2, 2017/21898-6]
- CNPq [2016/119884-0, 408430/2016-8, 407674/2016-0]
- CAPES
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Bisphenol A (BPA) is an environmental endocrine disrupting chemical, which can lead to various adverse health effects. Aiming to develop effective tools for the detection of BPA, this work reports a low cost and stable film based on casein (CAS) and Carbon Black (CB). The proposed material (CAS-CB) showed structures of CAS surrounded by CB agglomerates observed by Scanning Electron Microscopy while Fourier Transform Infrared Spectroscopy analysis illustrated characteristic bands of casein. Cyclic Voltammetry (CV) and linear sweep voltammetry (LSV) were used to investigate the electrochemical behavior of BPA using the CAS-CB. Under optimal conditions, LSV detection presented a limit of detection of 0.25 mu mol L-1 in a linear range from 0.49 to 24 mu mol L-1. Additionally, the working electrode (GC) modified by the proposed film (CAS-CB) was applied for BPA sensing in environmental and milk samples. The results showed recoveries between 95.4 to 114 % attesting the efficiency of this new material, which has simplicity in the preparation, high conductivity, and adsorption capability.
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