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Papers by Puthalapattu ReddyPrasad

Research paper thumbnail of Multifunctional characteristics of biosynthesized CoFe2O4@Ag nanocomposite by photocatalytic, antibacterial and cytotoxic applications

Chemosphere, Jan 31, 2024

Research paper thumbnail of Biosynthesis of CuFe2O4@Ag hybrid nanocomposite: Ultrasensitive detection and catalytic reduction of 4-nitrophenol

Chemical physics impact, Apr 1, 2024

Research paper thumbnail of Biosynthesis of ZnFe2O4@Ag hybrid nanocomposites for degradation of 2,4-Dichlorophenoxyacetic acid herbicide

Research paper thumbnail of Recent trends in the electrochemical sensors on β- and calcium channel blockers for hypertension and angina pectoris: A comprehensive review

Research paper thumbnail of Electrochemical non-enzymatic strategy with green synthesized Fe2O3CuO nanocomposite for detection of amiprofos-methyl herbicide in industrial effluents and soils

Research paper thumbnail of Synthesis and characterization of high fluorescent engineered carbon dots

Materials Today: Proceedings

Research paper thumbnail of An ultra-sensitive laccase/polyaziridine-bismuth selenide nanoplates modified GCE for detection of atenolol in pharmaceuticals and urine samples

Research paper thumbnail of LC-MS/MS Method, Development and Validation to Determine Three Tetracyclines and Their Epimers in Shrimp Samples

Oriental Journal of Chemistry, 2017

A modest liquid chromatography/tandem mass spectrometric method was developed and validated to de... more A modest liquid chromatography/tandem mass spectrometric method was developed and validated to determine three tetracycline antibiotics and their epimers tetracycline, oxytetracycline, chlortetracycline, 4-epi tetracycline, 4-epi oxytetracycline, 4-epi chlortetracycline in shrimp samples respectively. The procedure was involved the extraction of tetracyclines and its epimers from homogenized sample with EDTA-McIlvaine buffer followed by solid phase extraction clean up with Oasis HLB cartridge. The analysis was carried out using Inertsil ODS-3V, 5 micron, 150×4.6 mm column and mobile phase consists of 5 mM Oxalic acid in water (A) and 0.1% formic acid in methanol (B) in gradient mode at a flow rate of 0.8 mL/minutes. The final extracts were analyzed by the sensitive and selective LC/ESI/MS/MS operating in positive ion multiple reaction monitoring (MRM) mode.

Research paper thumbnail of Electrochemical Analysis of Antichemotherapeutic Drug Zanosar in Pharmaceutical and Biological Samples by Differential Pulse Polarography

Journal of Analytical Methods in Chemistry, 2013

The electrochemical reduction of zanosar was investigated systematically by direct current polaro... more The electrochemical reduction of zanosar was investigated systematically by direct current polarography, cyclic voltammetry, and differential pulse polarography (DPP). A simple DPP technique was proposed for the direct quantitative determination of anticancer drug zanosar in pharmaceutical formulation and spiked human urine samples for the first time. The reduction potential was −0.28 V versus Ag/AgCl with a hanging mercury drop electrode in Britton-Robinson buffer as supporting electrolyte. The dependence of the intensities of currents and potentials on pH, concentration, scan rate, deposition time, and nature of the supporting electrolyte was investigated. The calibration curve was found to be linear with the following equation:y=0.4041x+0.012, with a correlation coefficient of 0.992 (R2) over a concentration range from1.0×10-7 M to1.0×10-3 M. In the present investigation, the achieved limit of detection (LOD) and limit of quantization (LQD) were7.42×10-8 M and2.47×10-8 M; respect...

Research paper thumbnail of Developed voltammetric methods for pesticide analysis

The intention of this book is to review the modern voltammetric techniques with respect to introd... more The intention of this book is to review the modern voltammetric techniques with respect to introduction, experimental and results and discussion and shows how these relate to the voltammetric analysis of pesticides. The rising importance of voltammetry in the development of modified electrodes and nanosensors is also highlighted. The effect of substituents on the reduction of selected chosen functional group which are lying along the functional group has been discussed. The described electroanalytical methods have been conveniently applied and which has been routinely adopted for the determination of pesticides in urine and soil samples.

Research paper thumbnail of Ultrasonic synthesis of high fluorescent C-dots and modified with CuWO4 nanocomposite for effective photocatalytic activity

Journal of Molecular Structure, 2015

ABSTRACT High fluorescent C-dots were synthesized from dextrose via facile ultrasonic wave assist... more ABSTRACT High fluorescent C-dots were synthesized from dextrose via facile ultrasonic wave assisted reaction. Carbon dots (C-dots)/Copper tungstate (CuWO4) heterostructure has been prepared via a facile reflux approach. The novel C-dots/CuWO4 photocatalyst were characterized by using transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, UV–vis, photoluminescence and X-ray photoelectron spectroscopy. The photocatalytic property of heterostructure nanocomposite has also been investigated by using rhodamine B as a model organic pollutant. The obtained results revealed that as prepared C-dots are predominately multilayer graphene oxide with luminance properties. After incorporation of C-dots onto the CuWO4, it contributes to the improvement of charge separation and reduction of charge recombination and thereby enhancing the photocatalytic property, respectively. The C-dots in the nanocomposites can efficiently trap electrons, thus hindering the recombination of photogenerated electrons and holes. The heterostructure nanocomposite with 5.0 wt% C-dots shows the highest photocatalytic activity, which is about three times as that of pure CuWO4.

Research paper thumbnail of Selective detection of copper ion in water by tetradentate ligand sensor

Journal of the Taiwan Institute of Chemical Engineers

Research paper thumbnail of Electrochemical preparation of a novel type of C-dots/ZrO 2 nanocomposite onto glassy carbon electrode for detection of organophosphorus pesticide

Arabian Journal of Chemistry, Dec 1, 2019

ABSTRACT A selective, sensitive novel electrochemical sensor for detection of methyl parathion on... more ABSTRACT A selective, sensitive novel electrochemical sensor for detection of methyl parathion on the preparation of a carbon dots (C-dots)/ZrO2 nanocomposite was developed. The C-dots/ZrO2 nanocomposite was fabricated using electrochemical deposition onto a glassy carbon electrode and characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and cyclic voltammetry. The optimum parameters such as effect of pH, accumulation time, accumulation potential, scan rate, effect of amount of C-dots and effect of amount of ZrO2 were investigated. The C-dots/ZrO2 modified glassy carbon electrode allowed rapid, selective determination of methyl parathion in rice samples by adsorptive stripping voltammetry. The stripping response was highly linear over the methyl parathion concentrations ranging from 0.2 ng mL-1 to 48 ng mL-1, with a detection limit of 0.056 ng mL-1. This novel electrochemical nanocomposite-based electrochemical sensor was successfully applied for the detection of methyl parathion in rice samples.

Research paper thumbnail of Multifunctional characteristics of biosynthesized CoFe2O4@Ag nanocomposite by photocatalytic, antibacterial and cytotoxic applications

Chemosphere, Jan 31, 2024

Research paper thumbnail of Biosynthesis of CuFe2O4@Ag hybrid nanocomposite: Ultrasensitive detection and catalytic reduction of 4-nitrophenol

Chemical physics impact, Apr 1, 2024

Research paper thumbnail of Biosynthesis of ZnFe2O4@Ag hybrid nanocomposites for degradation of 2,4-Dichlorophenoxyacetic acid herbicide

Research paper thumbnail of Recent trends in the electrochemical sensors on β- and calcium channel blockers for hypertension and angina pectoris: A comprehensive review

Research paper thumbnail of Electrochemical non-enzymatic strategy with green synthesized Fe2O3CuO nanocomposite for detection of amiprofos-methyl herbicide in industrial effluents and soils

Research paper thumbnail of Synthesis and characterization of high fluorescent engineered carbon dots

Materials Today: Proceedings

Research paper thumbnail of An ultra-sensitive laccase/polyaziridine-bismuth selenide nanoplates modified GCE for detection of atenolol in pharmaceuticals and urine samples

Research paper thumbnail of LC-MS/MS Method, Development and Validation to Determine Three Tetracyclines and Their Epimers in Shrimp Samples

Oriental Journal of Chemistry, 2017

A modest liquid chromatography/tandem mass spectrometric method was developed and validated to de... more A modest liquid chromatography/tandem mass spectrometric method was developed and validated to determine three tetracycline antibiotics and their epimers tetracycline, oxytetracycline, chlortetracycline, 4-epi tetracycline, 4-epi oxytetracycline, 4-epi chlortetracycline in shrimp samples respectively. The procedure was involved the extraction of tetracyclines and its epimers from homogenized sample with EDTA-McIlvaine buffer followed by solid phase extraction clean up with Oasis HLB cartridge. The analysis was carried out using Inertsil ODS-3V, 5 micron, 150×4.6 mm column and mobile phase consists of 5 mM Oxalic acid in water (A) and 0.1% formic acid in methanol (B) in gradient mode at a flow rate of 0.8 mL/minutes. The final extracts were analyzed by the sensitive and selective LC/ESI/MS/MS operating in positive ion multiple reaction monitoring (MRM) mode.

Research paper thumbnail of Electrochemical Analysis of Antichemotherapeutic Drug Zanosar in Pharmaceutical and Biological Samples by Differential Pulse Polarography

Journal of Analytical Methods in Chemistry, 2013

The electrochemical reduction of zanosar was investigated systematically by direct current polaro... more The electrochemical reduction of zanosar was investigated systematically by direct current polarography, cyclic voltammetry, and differential pulse polarography (DPP). A simple DPP technique was proposed for the direct quantitative determination of anticancer drug zanosar in pharmaceutical formulation and spiked human urine samples for the first time. The reduction potential was −0.28 V versus Ag/AgCl with a hanging mercury drop electrode in Britton-Robinson buffer as supporting electrolyte. The dependence of the intensities of currents and potentials on pH, concentration, scan rate, deposition time, and nature of the supporting electrolyte was investigated. The calibration curve was found to be linear with the following equation:y=0.4041x+0.012, with a correlation coefficient of 0.992 (R2) over a concentration range from1.0×10-7 M to1.0×10-3 M. In the present investigation, the achieved limit of detection (LOD) and limit of quantization (LQD) were7.42×10-8 M and2.47×10-8 M; respect...

Research paper thumbnail of Developed voltammetric methods for pesticide analysis

The intention of this book is to review the modern voltammetric techniques with respect to introd... more The intention of this book is to review the modern voltammetric techniques with respect to introduction, experimental and results and discussion and shows how these relate to the voltammetric analysis of pesticides. The rising importance of voltammetry in the development of modified electrodes and nanosensors is also highlighted. The effect of substituents on the reduction of selected chosen functional group which are lying along the functional group has been discussed. The described electroanalytical methods have been conveniently applied and which has been routinely adopted for the determination of pesticides in urine and soil samples.

Research paper thumbnail of Ultrasonic synthesis of high fluorescent C-dots and modified with CuWO4 nanocomposite for effective photocatalytic activity

Journal of Molecular Structure, 2015

ABSTRACT High fluorescent C-dots were synthesized from dextrose via facile ultrasonic wave assist... more ABSTRACT High fluorescent C-dots were synthesized from dextrose via facile ultrasonic wave assisted reaction. Carbon dots (C-dots)/Copper tungstate (CuWO4) heterostructure has been prepared via a facile reflux approach. The novel C-dots/CuWO4 photocatalyst were characterized by using transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, UV–vis, photoluminescence and X-ray photoelectron spectroscopy. The photocatalytic property of heterostructure nanocomposite has also been investigated by using rhodamine B as a model organic pollutant. The obtained results revealed that as prepared C-dots are predominately multilayer graphene oxide with luminance properties. After incorporation of C-dots onto the CuWO4, it contributes to the improvement of charge separation and reduction of charge recombination and thereby enhancing the photocatalytic property, respectively. The C-dots in the nanocomposites can efficiently trap electrons, thus hindering the recombination of photogenerated electrons and holes. The heterostructure nanocomposite with 5.0 wt% C-dots shows the highest photocatalytic activity, which is about three times as that of pure CuWO4.

Research paper thumbnail of Selective detection of copper ion in water by tetradentate ligand sensor

Journal of the Taiwan Institute of Chemical Engineers

Research paper thumbnail of Electrochemical preparation of a novel type of C-dots/ZrO 2 nanocomposite onto glassy carbon electrode for detection of organophosphorus pesticide

Arabian Journal of Chemistry, Dec 1, 2019

ABSTRACT A selective, sensitive novel electrochemical sensor for detection of methyl parathion on... more ABSTRACT A selective, sensitive novel electrochemical sensor for detection of methyl parathion on the preparation of a carbon dots (C-dots)/ZrO2 nanocomposite was developed. The C-dots/ZrO2 nanocomposite was fabricated using electrochemical deposition onto a glassy carbon electrode and characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and cyclic voltammetry. The optimum parameters such as effect of pH, accumulation time, accumulation potential, scan rate, effect of amount of C-dots and effect of amount of ZrO2 were investigated. The C-dots/ZrO2 modified glassy carbon electrode allowed rapid, selective determination of methyl parathion in rice samples by adsorptive stripping voltammetry. The stripping response was highly linear over the methyl parathion concentrations ranging from 0.2 ng mL-1 to 48 ng mL-1, with a detection limit of 0.056 ng mL-1. This novel electrochemical nanocomposite-based electrochemical sensor was successfully applied for the detection of methyl parathion in rice samples.