Sangili AVinothkumar VChen S.-MVeerakumar PKING-CHUEN LIN2021-08-032021-08-0320219574522https://www.scopus.com/inward/record.uri?eid=2-s2.0-85098524012&doi=10.1007%2fs10854-020-04902-6&partnerID=40&md5=3f128752e1f4f625c24e41ec4560348bhttps://scholars.lib.ntu.edu.tw/handle/123456789/575805In this study, silver nanoparticle embedded on guar gum (AgNP/GG) nanocomposite was synthesized thoroughly in greenway via a simple in situ method by silver salt reduction using the guar gum (GG) polymer matrix. The highly water-soluble polysaccharide material (GG) was served as both stabilizing and reducing agent. Its structure and morphology were characterized by XRD, FT-IR, TEM, and UV?Vis spectroscopy. EIS, CV, and DPV methods have also been employed to investigate the electrochemical performance of the AgNP/GG nanocomposite. Analytical parameters such as loading amount of catalyst, scan rate, pH value, cyclic stability, repeatability, and reproducibility were optimized. The AgNP/GG/SPCE shows a distinct electrocatalytic oxidation of diphenylamine (DPA) in a wide linear range (WLR) of 0.01?9.09 ?M, a higher sensitivity of 6.879 ?M cm?2, and a limit of detection (LoD) of 5.4 nM (S/N = 3). The fabricated electrode exhibits an outstanding electrocatalytic performance in terms of good reproducibility, high stability, and acceptable anti-interference ability. In addition, this work advances the feasibility to determine DPA in apple juice sample with satisfactory recovery results. ? 2021, Springer Science+Business Media, LLC, part of Springer Nature.Electrocatalysis; Fruit juices; Green Synthesis; Nanocomposites; Silver halides; Silver nanoparticles; Analytical parameters; Electro-catalytic oxidation; Electrocatalytic performance; Electrochemical performance; Silver nanocomposites; Structure and morphology; Voltammetric determination; Water-soluble polysaccharides; Polymer matrix composites[SDGs]SDG3journal article10.1007/s10854-020-04902-62-s2.0-85098524012