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<p>Rhodamine B (RhB) is a toxic and carcinogenic food coloring agent that was formerly overused. Thus, it is crucial for food safety to develop affordable and effective analytical methods for RhB monitoring. This study presented a voltammetric sensor developed by employing Chamaecostus cuspidatus (insulin) leaf extract with MnO<sub>2</sub> nanoparticles (I-MnO<sub>2</sub>) for the sensitive detection of RhB. The synthesis of I-MnO<sub>2</sub> was done using the hydrothermal method. The I-MnO<sub>2</sub> nanoparticles were characterized by Field Emission Scanning Electron Microscope (FESEM), X-ray Diffraction Spectroscopy (XRD), Energy Dispersive X-ray Analysis (EDAX), and Fourier Transform Infrared Spectroscopy (FTIR). The electrochemical behavior of RhB was investigated using Differential Pulse Voltammetry (DPV), Linear Sweep Voltammetry (LSV), and Cyclic Voltammetry (CV). The linear regression of the sensor for various concentrations of RhB is R<sup>2</sup> = 0.98317. The detection Limit and sensitivity of the sensor are 0.7515 µM and 10.9950 µAµM<sup>−1</sup>cm<sup>−2</sup>. The quantification Limit of the proposed sensor is 2.5051 µM. Analytical characteristics, including stability, Linearity, and sensitivity, are also examined. The Linear range of detection was 1–5 µM. Differential Pulse Voltammetry (DPV) was used to obtain the calibration curve for quantitative determination after the experimental circumstances were improved to increase the sensitivity. At pH 12, the highest current was measured. Concerning the RhB oxidation peak current, the modified electrode demonstrated outstanding electrocatalytic properties.</p>

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Electroanalytic sensing of Rhodamine B detection using chamaecostus cuspidatus-MnO2 nanoparticles

  • 期刊论文

  • 发表日期：

    2025年9月19日

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  • Mythili Kumaresan Kavitha,
  • Radha Sankararajan,
  • Sreeja Balakrishnapillai Suseela,
  • Muthumeenakshi Kailasam,
  • Vijayalakshmi Kailasam

摘要

Rhodamine B (RhB) is a toxic and carcinogenic food coloring agent that was formerly overused. Thus, it is crucial for food safety to develop affordable and effective analytical methods for RhB monitoring. This study presented a voltammetric sensor developed by employing Chamaecostus cuspidatus (insulin) leaf extract with MnO2 nanoparticles (I-MnO2) for the sensitive detection of RhB. The synthesis of I-MnO2 was done using the hydrothermal method. The I-MnO2 nanoparticles were characterized by Field Emission Scanning Electron Microscope (FESEM), X-ray Diffraction Spectroscopy (XRD), Energy Dispersive X-ray Analysis (EDAX), and Fourier Transform Infrared Spectroscopy (FTIR). The electrochemical behavior of RhB was investigated using Differential Pulse Voltammetry (DPV), Linear Sweep Voltammetry (LSV), and Cyclic Voltammetry (CV). The linear regression of the sensor for various concentrations of RhB is R2 = 0.98317. The detection Limit and sensitivity of the sensor are 0.7515 µM and 10.9950 µAµM−1cm−2. The quantification Limit of the proposed sensor is 2.5051 µM. Analytical characteristics, including stability, Linearity, and sensitivity, are also examined. The Linear range of detection was 1–5 µM. Differential Pulse Voltammetry (DPV) was used to obtain the calibration curve for quantitative determination after the experimental circumstances were improved to increase the sensitivity. At pH 12, the highest current was measured. Concerning the RhB oxidation peak current, the modified electrode demonstrated outstanding electrocatalytic properties.