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Highly dispersible palladium nanoparticles embedded reduced graphene oxide nanoarchitectures (Pd@NrGO/GCE) synthesized via microemulsion route with excellent electrocatalytic performance and lower detection limits upto 1.067 ng ml−1 for methylparathion (MP) [Display omitted] • Cost effective, energy efficient and green methodology. • Large surface area and monodispersed system resulted in excellent electrochemical response. • Acquired sensitivity of the order of 0. 351 µA.mlng−1. • Real time application to vegetable and water samples. The environment-friendly and energy-efficient monodispersed carbon-based nanosystems for environment monitoring are always in colossal demand. The present work has come up with a novel reverse microemulsification route which is inherently safer, energy-efficient and toxicant free approach for synthesis of monodisperse palladium nanoparticles embedded RGO based nanoreactors (Pd@NrGO/GCE). In present system, Pd@NrGO/GCE are acting as nanoreactors by providing large surface areas for electrocatalysis of methylparathion and allowing the study of redox attributes at faster rates. The successful characterization was done using X-ray diffraction studies, Raman spectroscopy, field emission scanning electron microscopy, small angle X-ray scattering and high resolution transmission electron microscopy analysis. The electroanalytical response in the square wave anodic stripping voltammetry has been generated by the adsorption of MP followed by subsequent redox catalysis by Pd@NrGO/GCE. The homogeneous film fabrication was enabled by smooth spherical nanostructures imparting higher surface areas with small particle size. The sensor performance towards oxidation of MP poses wide linearity and a low limit of detection of 1.067 ngml−1 with successful application to real time analysis. [ABSTRACT FROM AUTHOR]

[Display omitted] • A sensitive electrochemical sensor is used for analysis of sunset yellow. • A SiO 2 @MIP-PDA was synthesized with a one-step green method. • SiO 2 nanoparticles were coated with sunset yellow-imprinted polydopamine. • The coated nanoparticles acted as an electrochemical sensor for sunset yellow. • A highly sensitive and selective electrochemical interface for sunset yellow was achieved. • The proposed method might be reliable and effective for SY sensing in food samples. Since synthetic dyes in food samples have the potential to be toxic and pathogenic, their monitoring and evaluation are of particular importance, so it is essential to use methods that are simple and cost-effective for their determination. We have here devised an electrochemical method for the determination of sunset yellow (SY) in food samples. Since the fact that dopamine in the water can be spontaneously polymerized (self-polymerized) in the presence of sunset yellow as a template leads to the fabrication of polydopamine (PDA) imprinted, then by introducing this layer on the silica nanoparticles (SiO 2) surfaces with an optimized green one-step synthesis method, SiO 2 @MIP PDA NPs achieved. The synthesized SiO 2 @MIP PDA NPs were identified by Field emission scanning electron microscopy (FE-SEM), High resolution transmission electron microscopy (HRTEM), Atomic force microscopy (AFM), Thermal gravimetric analysis (TGA), and Fourier transform infrared spectroscopy (FTIR) techniques. Then, using this MIP, we modified a CPE electrode and built a sensor to detect the SY at optimum conditions. The sensor has a sensitive response and high selectivity for the SY compared to other analogs and similar structural molecules. It also has good stability and acceptable reproducibility. The built-in sensor had a linear response range of 4.5 nM to 9.1 µM, and a detection limit of 1.5 nM (S/N = 3). This sensor has been used successfully to diagnose SY in several food samples. The extraordinary behavior of this sensor can be assigned to the imprinted cavities of the effective matrix which matched strongly and non-imprinted PDA electronic barriers to the molecules that are outside. [ABSTRACT FROM AUTHOR]