Efficient electrochemical detection of L-lactic acid using platinum nanoparticle decorated Chitosan/ZnTiO3 nanocomposites

Abstract

Herein, a facile L-lactic acid electrochemical sensor based on Pt-nanoparticles (NPs)@Chitosan/ZnTiO3 nanocomposites (NCs) coated on a glassy carbon electrode (GCE) is demonstrated. Ultra-sonication method followed by irradiation using an Osram Hg-lamp was applied to prepare Pt-NPs@Chitosan/ZnTiO3 NCs, and the characterization of prepared NCs was executed by Field Emission Scanning Electron Microscopy FESEM, Energy Dispersive Spectroscopy EDS, Transmission Electron Microscopy TEM, High Resolution Transmission Electron Microscopy HRTEM, Fourier Transform Infrared Spectroscopy FTIR, Ultraviolet–visible spectroscopy UV–vis., and X ray Diffraction XRD analysis. A linear current versus potential responses relation was obtained in a concentration range of L-lactic acid of 0.30 ∼ 2.40 mM at differential pulse voltammetric (DPV) analysis in a pH 7.0 buffer medium and resulted concentration range was defined as the dynamic detection range (LDR) for L-lactic acid analysis. The L-lactic acid sensor sensitivity (0.4529 µAµM-1cm−2), limit of detection (LOD; 22.36 ± 1.12 µM), and limit of quantification (LOQ; 79.88 µM) were obtained. Besides this, the sensor reproducibility and response time were found to be reliable. Finally, the assembled sensor probe was validated by the testing of real samples, which exhibited acceptable and satisfied results. It is introduced a new route for the detection of chemicals using novel nanocomposite materials by electrochemical approach for the safety of healthcare fields in a broad scales.