• Hong Jiang

      Articles written in Journal of Chemical Sciences

    • Electrochemical determination of hydrogen peroxide usingo-dianisidine as substrate and hemoglobin as catalyst

      Wei Sun Hong Jiang Kui Jiao

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      A new electrochemical method for the determination of microamounts of hydrogen peroxide utilizing o-dianisidine (ODA) as substrate and hemoglobin (Hb) as catalyst is described in this paper. Hb can be used as mimetic peroxidase and it can catalyse the reduction of hydrogen peroxide with the subsequent oxidation of ODA. The oxidative reaction product is an azo compound, which is an electroactive substance and has a sensitive second-order derivative polarographic reductive peak at the potential of -0.58 V (vs. SCE) in pH 80 Britton-Robinson (B-R) buffer solution. The conditions of Hb-catalytic reaction and polarographic detection of the reaction product were carefully studied. By using this polarographic peak and under optimal conditions, the calibration curve for the H2O2 was constructed in the linear range of 2.0 x 10-7 ∼ 10 x 10-4 mol/l with the detection limit of 5.0 x 10-8 mol/l. This method can also be used to the determination of Hb content in the range of 20 x 10-9 ∼ 30 x 10-7 mol/l with a detection limit of 10 x 10-9 mol/l. The proposed method was further applied to the determination of the content of H2O2 in fresh rainwater with satisfactory results. The catalytic reaction mechanism and the electrode reductive process of the reaction product were carefully studied.

    • Diethylamine functionalized polyethylene glycol as a novel and efficient catalyst for Knoevenagel condensation

      Wen Ye Hong Jiang Xian-Cao Yang

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      The Knoevenagel condensation of aromatic aldehydes with active methylene is an efficient reaction for carbon-carbon double bond formation. A rapid, efficient, and ecofriendly protocol for the Knoevenagel condensation of active methylene compounds with aldehydes has been developed with diethylamine functionalized polyethylene glycol-600 (PEG-600) as catalyst with good to excellent yields at room temperature without solvent.

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