Simultaneous Detection of Epicatechin and Theophylline in Black Tea with Nano Cupric Oxide Infused Graphite Electrode

Author:

Moulick Madhurima1ORCID,Das Debangana2ORCID,Nag Shreya3ORCID,Paul Anindita4ORCID,Das Deepak Kumar5ORCID,Roy Runu Banerjee1

Affiliation:

1. Department of Instrumentation and Electronics Engineering, Jadavpur University, Kolkata 700106, West Bengal, India

2. Department of Electronics and Communication Engineering, Silicon Institute of Technology, Bhubaneshwar, India

3. Department of Electronics and Communication Engineering, University of Engineering and Management, Kolkata, West Bengal, India

4. Department of Electronics and Instrumentation Engineering, National Institute of Technology, Agartala, India

5. Department of Chemistry and Nanoscience, GLA University, Mathura, Uttar Pradesh, India

Abstract

A novel cupric oxide nanoparticles (CuO NPs) infused graphite electrode (CuO@GP) was synthesized for simultaneous detection of epicatechin (EC) and theophylline (TH) in black tea. The CuO NPs were synthesized via the sol–gel method and characterized using X-ray diffraction and a scanning electron microscope. The electrochemical sensor performance was studied using cyclic voltammetry and differential pulse voltammetry revealing the presence of TH and EC simultaneously in black tea. The electrode demonstrated a linear range of 50.0–100.0 [Formula: see text]M for both analytes, with a room temperature limit of detection (4.0 [Formula: see text]M for EC, 27.0 [Formula: see text]M for TH). Under the optimal conditions, it showed repeatability (with a relative standard deviation (RSD): 1.61% EC, 0.96% TH), reproducibility (RSD: 1.07% EC, 1.14% TH) and stability (RSD: 2.16% EC, 2.15% TH). CuO@GP exhibited notable selectivity and promising results in tea samples, achieving recovery rates of 102–107% for EC and 101.7–106% for TH.

Publisher

World Scientific Pub Co Pte Ltd

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