Novel electrosynthesis of CdS/FeS nanocomposite-modified poly(o-phenylenediamine) with views to their use as a biosensor for Escherichia coli

Arabian Journal of Chemistry

Francisco Martín¹  Gonzalo Riveros²  Franco Hernández³  Susy Lizama⁴  Eduardo Berrios⁵  Loreto. A. Hernández⁶  Ernesto González⁶  Darío M. González⁶ 

[1] Corresponding author.;Ingeniería Química, Universidad de Málaga, Málaga E29071, Spain;Escuela de Ingeniería Bioquímica, Pontificia Universidad Católica de Valparaíso, Avenida Brasil 2085, Valparaíso, Chile;Instituto de Química, Pontificia Universidad Católica de Valparaíso, campos Curauma, Avda. Universidad 330, Curauma, Valparaíso, Chile;;Laboratorio de Materiales y Superficies (Unidad Asociada al CSIC), Departamentos de Física Aplicada &Laboratorio de electroquímica, Instituto de Química y Bioquímica, Facultad de Ciencias, Universidad de Valparaíso, Avda. Gran Bretaña 1111, Playa Ancha, Valparaíso, Chile;

关键词: Polymers;    Poly(o-phenylenediamine);    Nanocomposites;    CdS;    FeS;    Escherichia coli;   

DOI  :  

来源: DOAJ

【 摘 要 】

This article proposes a new electrochemical sensor for Escherichia coli (E. Coli) composed of poly(o-phenylenediamine) (PoPD) and CdS/FeS nanocomposites (PoPD|CdS/FeS). The preparation of the modified electrodes used for this purpose and their subsequent use as a sensor comprise a simple, fast and reproducible technique. The characterization of the CdS/FeS nanocomposites and their subsequent inclusion on PoPD was performed by X-ray diffraction (XRD), Raman, field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HR-TEM) and computational methods; For the nanocomposites an average size of 100 nm was obtained after applying a reduction potential for 5 s over the polymeric matrix. The electrochemical characterizations confirmed that the inclusion of the nanocomposites improved the amperometric response, allowing the developed material to be used as an electrochemical sensor for E. Coli. The figures obtained gave the linear equation j = -6.89 × 10−14 × CFU + 5.64 × 10−5, with an R2 of 0.995, for 10 replicates. Furthermore, the limit of detection (LOD) was 6.1 × 105 CFU/mL, and the limit of quantification (LOQ) was 6.1 × 106 CFU/mL.

【 授权许可】

Unknown