A simple and efficient procedure for the preparation of aryl- 14-H-dibenzo [aj]xanthenes by a one-pot condensation reaction of 2-naphthol and aryl aldehydes, in the presence of silica supported sodium hydrogen sulfate...A simple and efficient procedure for the preparation of aryl- 14-H-dibenzo [aj]xanthenes by a one-pot condensation reaction of 2-naphthol and aryl aldehydes, in the presence of silica supported sodium hydrogen sulfate （NaHSO4/SiO2） as a catalyst and in the absence of solvent has been developed. The present method offers several advantages such as excellent yields, short reaction time （10-30min）, mild condition, simple work-up, and the use of a cheap and environmentally friendly catalyst with remarkable reusability.展开更多
catalyst for the synthesis of 14-aryl- 14-H-dibenzo[aj]xanthenes Silica supported ammonium dihydrogen phosphate （NH4H2PO4/SiO2） is found to be a recyclable heterogeneous catalyst for a rapid and efficient synthesis ...catalyst for the synthesis of 14-aryl- 14-H-dibenzo[aj]xanthenes Silica supported ammonium dihydrogen phosphate （NH4H2PO4/SiO2） is found to be a recyclable heterogeneous catalyst for a rapid and efficient synthesis of various aryl-14-H-dibenzo[a,j]xanthenes with excellent yields under solvent-free conditions. The present methodology offers several advantages such as excellent yields, simple procedure, short reaction times and milder conditions. 2009 Shahnaz Rostamizadeh. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.展开更多
A simple and rapid protocol for the synthesis of polystyrene-graphene oxide nanocomposite （PS/GONC） was achieved for first time using an in situ polymerization method. PS/GONC modified glassy carbon electrode （PS/G...A simple and rapid protocol for the synthesis of polystyrene-graphene oxide nanocomposite （PS/GONC） was achieved for first time using an in situ polymerization method. PS/GONC modified glassy carbon electrode （PS/GONC/GCE） has been employed as an efficient nanosensor for the electrooxidation of histamine. The PS/GONC/GCE is used as an electrochemical nanosensors for monitoring histamine using differential pulse voltammetry techniques （detection limit 0.03 μmol/L）. In addition, the prepared nanosensor was successfully applied to determine histamine in fish samples, yielding satisfactory results. The spiked recoveries were in the range of 98.2%-103.1%.展开更多
Low toxic graphene quantum dot（GQD） was synthesized by pyrolyzing citric acid in alkaline solution and characterized by ultraviolet-visible（UV-vis） spectroscopy,X-ray diffraction（XRD）,atomic force microscopy（AF...Low toxic graphene quantum dot（GQD） was synthesized by pyrolyzing citric acid in alkaline solution and characterized by ultraviolet-visible（UV-vis） spectroscopy,X-ray diffraction（XRD）,atomic force microscopy（AFM）,spectrofluorimetery and dynamic light scattering（DLS） techniques.GQD was used for electrode modification and electro-oxidation of doxorubicin（DOX） at low potential.A substantial decrease in the overvoltage（- 0.56 V） of the DOX oxidation reaction（compared to ordinary electrodes） was observed using GQD as coating of glassy carbon electrode（GCE）.Differential pulse voltammetry was used to evaluate the analytical performance of DOX in the presence of phosphate buffer solution（pH 4.0） and good limit of detection was obtained by the proposed sensor.Such ability of GQD to promote the DOX electron-transfer reaction suggests great promise for its application as an electrochemical sensor.展开更多
基金the K.N.Toosi University of Technology Research Council for financial support.
文摘A simple and efficient procedure for the preparation of aryl- 14-H-dibenzo [aj]xanthenes by a one-pot condensation reaction of 2-naphthol and aryl aldehydes, in the presence of silica supported sodium hydrogen sulfate （NaHSO4/SiO2） as a catalyst and in the absence of solvent has been developed. The present method offers several advantages such as excellent yields, short reaction time （10-30min）, mild condition, simple work-up, and the use of a cheap and environmentally friendly catalyst with remarkable reusability.
文摘catalyst for the synthesis of 14-aryl- 14-H-dibenzo[aj]xanthenes Silica supported ammonium dihydrogen phosphate （NH4H2PO4/SiO2） is found to be a recyclable heterogeneous catalyst for a rapid and efficient synthesis of various aryl-14-H-dibenzo[a,j]xanthenes with excellent yields under solvent-free conditions. The present methodology offers several advantages such as excellent yields, simple procedure, short reaction times and milder conditions. 2009 Shahnaz Rostamizadeh. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.
基金the support of this work by Drug Applied Research Center,Tabriz University of Medical Science and Payame Noor University
文摘A simple and rapid protocol for the synthesis of polystyrene-graphene oxide nanocomposite （PS/GONC） was achieved for first time using an in situ polymerization method. PS/GONC modified glassy carbon electrode （PS/GONC/GCE） has been employed as an efficient nanosensor for the electrooxidation of histamine. The PS/GONC/GCE is used as an electrochemical nanosensors for monitoring histamine using differential pulse voltammetry techniques （detection limit 0.03 μmol/L）. In addition, the prepared nanosensor was successfully applied to determine histamine in fish samples, yielding satisfactory results. The spiked recoveries were in the range of 98.2%-103.1%.
基金financial support by the Hematology-Oncology Research Center,Tabriz University of Medical Sciences,under Grants No.93/5
文摘Low toxic graphene quantum dot（GQD） was synthesized by pyrolyzing citric acid in alkaline solution and characterized by ultraviolet-visible（UV-vis） spectroscopy,X-ray diffraction（XRD）,atomic force microscopy（AFM）,spectrofluorimetery and dynamic light scattering（DLS） techniques.GQD was used for electrode modification and electro-oxidation of doxorubicin（DOX） at low potential.A substantial decrease in the overvoltage（- 0.56 V） of the DOX oxidation reaction（compared to ordinary electrodes） was observed using GQD as coating of glassy carbon electrode（GCE）.Differential pulse voltammetry was used to evaluate the analytical performance of DOX in the presence of phosphate buffer solution（pH 4.0） and good limit of detection was obtained by the proposed sensor.Such ability of GQD to promote the DOX electron-transfer reaction suggests great promise for its application as an electrochemical sensor.
