Sunlight assisted synthesis of silver nanoparticles in zeolite matrix and study of its application on electrochemical detection of dopamine and uric acid in urine samples.
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, N2 adsorption-desorption BET isotherm and X-ray diffraction techniques. The incorporation of silver nanoparticles 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 +0.31V and +0.43V (vs. Ag/AgCl) using AgNP/Zeo-Y/GCE under the optimum experimental condition. A well-resolved peak potential window (~120mV) 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 0.02×10(-6) to 0.18×10(-6)M (R(2)=0.9899) and 0.05×10(-6) to 0.7×10(-6)M (R(2)=0.9996) and the detection limits were found to be 1.6×10(-8)M and 2.51×10(-8)M by using differential pulse voltammetry (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.
Department of Inorganic Chemistry, University of Madras, Guindy Campus, Chennai 600 025, India.
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S
Meenakshi
Department of Inorganic Chemistry, University of Madras, Guindy Campus, Chennai 600 025, India.
S
S
Devi
Department of Inorganic Chemistry, University of Madras, Guindy Campus, Chennai 600 025, India. Electronic address: jeevapandian@yahoo.co.uk.
K
K
Pandian
Department of Chemistry, Guru Nanak College, Velachery, Chennai 600 042, India.
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R
Devendiran
Department of Chemistry, Guru Nanak College, Velachery, Chennai 600 042, India.
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M
Selvaraj
D002244:Carbon / Q000737:chemistry; D002384:Catalysis; D002623:Chemistry Techniques, Analytical / Q000295:instrumentation / Q000379:methods*; D058266:Dielectric Spectroscopy; D004298:Dopamine / Q000652:urine*; D055664:Electrochemical Techniques; D004566:Electrodes; D006801:Humans; D006863:Hydrogen-Ion Concentration; D057230:Limit of Detection; D053768:Metal Nanoparticles / Q000737:chemistry*; D010084:Oxidation-Reduction; D016062:Porosity; D015203:Reproducibility of Results; D012834:Silver / Q000737:chemistry*; D013472:Sunlight; D014527:Uric Acid / Q000652:urine*; D014961:X-Ray Diffraction; D017641:Zeolites / Q000737:chemistry*
D017641:Zeolites; D014527:Uric Acid; D012834:Silver; D002244:Carbon; D004298:Dopamine
Dopamine; Silver nanoparticles; Simultaneous detection; Sunlight assisted synthesis; Urine samples