Journal
MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS
Volume 69, Issue -, Pages 85-94Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.msec.2016.06.037
Keywords
Sunlight assisted synthesis; Silver nanoparticles; Simultaneous detection; Dopamine; Urine samples
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Sunlight assisted reduction of silver ions were accomplished for the synthesis of silver nanoparticles incorporated within the mesoporous silicate framework of zeolite Y. The zeolite-Y and AgNP/Zeo-Y were characterized by field emission scanning electron microscopy, transmission electron microscopy, N-2 adsorption-desorption BET isotherm and X-ray diffraction techniques. The incorporation of silver nanopartides within the porous framework was further confirmed by cyclic voltammetry and electrochemical impedance spectroscopy. An enhanced electrocatalytic oxidation of biologically important molecules like dopamine and uric acid using AgNP/Zeo-Y modified glassy carbon electrode has been developed. A simultaneous oxidation of DA and UA peaks were obtained at +0.31 V and +0.43 V (vs. Ag/AgCl) using AgNP/Zeo-Y/GCE under the optimum experimental condition. A well-resolved peak potential window (similar to 120 mV) for the oxidation of both DA and UA were observed at AgNP/Zeo-Y/GCE system. The calibration curves for DA and UA were obtained within the dynamic linear range of 0.02 x 10(-6) to 0.18 x 10(-6) M (R-2 = 0.9899) and 0.05 x 10(-6) to 0.7 x 10(-6) M (R2 = 0.9996) and the detection limits were found to be 1.6 x 10(-6) M and 2.51 x 10(-6) M by using differential pulse voltammety (DPV) method. The proposed method was successfully applied for the determination of both DA and UA in human urine samples with a related standard deviation was <3%, and n = 5 using the standard addition method. (C) 2016 Elsevier B.V. All rights reserved.
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