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Electrochemical Sensor Based on Casein and Carbon Black for Bisphenol A Detection
Author(s) -
Vieira Jodar Letícia,
Orzari Luiz Otávio,
Storti Ortolani Túlio,
Assumpção Mônica H. M. T.,
Vicentini Fernando C.,
Janegitz Bruno C.
Publication year - 2019
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201900176
Subject(s) - detection limit , linear sweep voltammetry , bisphenol a , carbon black , differential pulse voltammetry , cyclic voltammetry , electrochemical gas sensor , materials science , fourier transform infrared spectroscopy , electrochemistry , adsorption , glassy carbon , bisphenol , carbon paste electrode , chemistry , analytical chemistry (journal) , chemical engineering , electrode , chromatography , organic chemistry , natural rubber , epoxy , engineering
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 μmol L −1 in a linear range from 0.49 to 24 μmol 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.