A powerful electrochemical sensor based on Fe 3 O 4 nanoparticles-multiwalled carbon nanotubes hybrid for the effective
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ORIGINAL PAPER
A powerful electrochemical sensor based on Fe3O4 nanoparticlesmultiwalled carbon nanotubes hybrid for the effective monitoring of sunset yellow in soft drinks P. Shaikshavali1 · T. Madhusudana Reddy1 · A. Lakshmi Narayana2 · O. M. Hussain2 · G. Venkataprasad1 · T. Venu Gopal1 Received: 4 March 2020 / Accepted: 19 July 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The investigation of synthetic dyes in beverages is significant, owing to their pathogenic and low toxicity a F e3O4–MWCNTs electrochemical sensor was developed for the determination of sunset yellow (SY) in beverages. A simple one-step hydrothermal method was implemented for the synthesis of Fe3O4–MWCNTs nanocomposite. The structural and surface morphologies of Fe3O4–MWCNTs were studied using XRD, TEM, EDS and FE-SEM techniques. The synthesized nanocomposite showed cubic face centered F e3O4 nanostructure with a probable crystallite size. The anchoring of F e3O4 nanoparticles in MWCNTs were further conformed with TEM analysis. The FE-SEM analysis showed that the cubical shaped F e3O4 nanoparticles were strongly anchored with an estimated granules size. The synthesized composite was utilized for the fabrication of sensitive and selective electrochemical sensor based on the drop casting of F e3O4–MWCNTs composite on glassy carbon electrode (GCE) (Fe3O4–MWCNTs/GCE). The fabricated sensor was used for the quantification of SY. The sensor exhibited enhanced oxidation activity towards SY determination, by providing operational access to its determination in the field of food safety control. CV, DPV, and EIS techniques were utilized for the investigation of the electrochemical performance of SY. The influence of pH value of phosphate buffer solution (PBS) and effect of scan rate on the peak currents of SY were deliberated. The oxidation peak currents of SY were proportional to its concentrations in the range from 0.2 to 3.5 µM with a low limit of detection of 1.4 nM. The newly fabricated sensor exhibited good selectivity, stability, repeatability and reproducibility. Moreover, it was successfully applied for the detection of SY in soft drinks with acceptable recoveries. The developed sensor was viable with a good sensitivity and simple option for SY detection in the field of food safety. Keywords Sunset yellow · Tartrazine · Fe3O4–MWCNTs nanocomposite · Soft drinks
Introduction Nowadays, synthetic dyes were extensively utilized in food coloring, medicines, cosmetics, beverages, etc., owing to their peculiar advantages such as good color uniformity, excellent solubility in water, low manufacturing cost and minor microbiological contamination [1–3]. The high * T. Madhusudana Reddy [email protected] 1
Electrochemical Research Laboratory, Department of Chemistry, S.V.U. College of Sciences, Sri Venkateswara University, Tirupati, Andhra Pradesh 517502, India
Thin‑Films Laboratory, Department of Physics, Sri Venkateswara University, Tirupati, Andhra Pradesh 517502, India
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