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Reactive Extraction of o-Aminophenol Using Trialkylphosphine Oxide 被引量:2
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作者 李德亮 刘小强 崔节虎 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2006年第1期46-50,共5页
Extraction of o-aminophenol (OAP) using trialkylphosphine oxide (TRPO) was studied with different diluents. The neutral OAP was extracted using TRPO under an equilibrium pH in the range of 6—7.5, and a maximum distri... Extraction of o-aminophenol (OAP) using trialkylphosphine oxide (TRPO) was studied with different diluents. The neutral OAP was extracted using TRPO under an equilibrium pH in the range of 6—7.5, and a maximum distribution coefficient occurred. It was confirmed that the pH value and the TRPO concentration are the key factors that affect dis-tribution coefficient. Nonpolar diluents could provide better extraction distribution coefficient for the extraction of OAP and the order is: kerosene >n-octanol >chloroform. 展开更多
关键词 reactive extraction o-aminophenol trialkylphosphine oxide DILUENT
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Theoretical Study on the Reaction Mechanism of o-Aminophenol, Acetic Acid and Phosphorus Oxytrichloride One-pot to Form 2-Methyl Benzoxazole
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作者 ZHANG Fu-Lan 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2018年第12期1869-1877,1843,共10页
The reaction mechanism of o-aminophenol, acetic acid and phosphorus oxytrichloride in one-pot to form 2-methyl benzoxazole was studied by density functional theory. The geometries of the reactants, transition states, ... The reaction mechanism of o-aminophenol, acetic acid and phosphorus oxytrichloride in one-pot to form 2-methyl benzoxazole was studied by density functional theory. The geometries of the reactants, transition states, intermediates and products were optimized at the GGA/PW91/DNP level. Vibration analysis was carried out to confirm the transition state structure. Two possible reaction pathways were investigated in this study. The result indicates that the reaction Re→TS1→IM1→TSA2→IMA2→TSA3→IMA3→TSA4→IMA4→TSA5→P2 is the main pathway, the activation energy of which is the lowest. Re→TS1→IM1 is the rate-limiting step, with the activation energy being 221.54 kJ·mol^(-1) and the reaction heat being 10.06 kJ·mol^(-1). The dominant product predicted theoretically is in agreement with the experiment results. 展开更多
关键词 o-aminophenol acetic acid phosphorus oxytrichloride 2-methyl benzoxazole density functional reaction mechanism
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Non-Conducting Poly(O-Aminophenol) Films in the Field of the Bioelectrochemistry
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作者 Ricardo Tucceri 《American Journal of Analytical Chemistry》 2013年第6期13-26,共14页
The practical use of non-conducting poly(o-aminophenol) (POAP) films in the field of the bioelectrochemistry is discussed in this paper. Particular emphasis is given to the effects of applied potential, solution pH an... The practical use of non-conducting poly(o-aminophenol) (POAP) films in the field of the bioelectrochemistry is discussed in this paper. Particular emphasis is given to the effects of applied potential, solution pH and interferents on the response current of biosensors based on POAP. 展开更多
关键词 Poly(o-aminophenol) Biosensor AMPEROMETRIC Response Glucose Uric Acid Hydrogen Peroxide Lactate NICOTINAMIDE COENZYMES
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Fast Determination of Vitamin B<sub>2</sub>Based on Molecularly Imprinted Electrochemical Sensor 被引量:1
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作者 Peidong Xu Changsheng Qiao +3 位作者 Shufeng Yang Lijuan Liu Mingwei Wang Juankun Zhang 《Engineering(科研)》 2012年第10期129-134,共6页
Under the condition of weak acidity of pH 5.2, a sensitive vitamin B2 electrochemical sensor based on molecularly imprinted nonconducting polymer of o-aminophenol by potentiostatic polymerization in the presence of te... Under the condition of weak acidity of pH 5.2, a sensitive vitamin B2 electrochemical sensor based on molecularly imprinted nonconducting polymer of o-aminophenol by potentiostatic polymerization in the presence of template(vitamin B2) on a glassy carbon electrode was prepared, and its performance was studied. The sensor exhibited good sensitivity and selectivity to VB2. The detection limit went down to 2.3851nM, and a linear relationship between the current incremental and the concentration was found in the range of 10~120nM. And the sensor could use in detection of VB2 real sample for a long time and show good reproducibility. The average recovery rate to VB2 was 98.41%. 展开更多
关键词 VITAMIN B2 Molecularly Imprinted Technique POTENTIOSTATIC Polymerization o-aminophenol Drug DETERMINATION
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The Metal/Electroactive Polymer Interface Studied by Surface Resistance
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作者 Ricardo Tucceri 《Journal of Surface Engineered Materials and Advanced Technology》 2013年第3期205-216,共12页
The experimental arrangement in this investigation was one in which a poly(o-aminophenol) (POAP) film was supported on a thin gold film electrode whose thickness is of the order of the mean free path of conduction ele... The experimental arrangement in this investigation was one in which a poly(o-aminophenol) (POAP) film was supported on a thin gold film electrode whose thickness is of the order of the mean free path of conduction electrons of gold. This arrangement allows one to apply the surface resistance technique to study the electrochemical processes occurring at the metal film surface coated with the polymer film. The dependence of the resistance change of the thin gold film electrode on the external electrolyte composition for polymer thickness lower than 0.25 mC.cm-2, was attributed to a competition, at the gold film surface, between the redox process of the polymer and adsorption of different ion species contained in the electrolyte. This competition reflects a discontinuous character of polymer thickness lower than 0.25 mC.cm-2 at the metal polymer interface. The resistance response of the metal film becomes independent of both the external electrolyte composition and polymer thickness for polymer thickness higher than 0.8 mC.cm-2. Then, POAP thicknesses higher than 0.8 mC.cm-2 seem to be compact enough at the metal polymer interface to prevent the interaction of the species contained in the supporting electrolyte with the gold film surface. The increase of the gold film resistance in going from the reduced to the oxidized state for POAP thicknesses higher than 0.8 mC.cm-2 was attributed to the redox conversion of poly(o-aminophenol) from amine to imine groups. This resistance increase was explained as a transition from specular to diffuse scattering of conduction electrons of gold at the gold poly(o-aminophenol) interface due to a less compact distribution of oxidised sites of POAP as compared with that of the reduced ones. An attenuation of the resistance response of the gold film was observed when the POAP films were deactivated either by contact with a ferric cation solution or prolonged potential cycling. The deactivation of the polymer film was attributed to the creation of inactive gaps within the redox sites configuration of POAP. The surface resistance technique allows one to detect different redox sites configurations of POAP on the gold film, according to the method used to deactivate the polymer films. In this work, it is demonstrated that the surface resistance technique can be employed to study not only the ability of a POAP film to inhibit the interaction of different species in solution with a metal surface but also the deactivation of the polymer film. 展开更多
关键词 Surface Resistance Thin GOLD Film ELECTRODE Poly(o-aminophenol) Films Poly(o-aminophenol) GOLD In-terface Poly(o-aminophenol) DEACTIVATION
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Enzyme-catalyzed reaction of voltammetric enzyme-linked immunoassay system based on OAP as substrate
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作者 张书圣 陈洪渊 焦奎 《Science China Chemistry》 SCIE EI CAS 1999年第2期195-203,共9页
Theo-aminophenol (OAP)-H2O2-horseradish peroxidase (HRP) voltammetric enzyme-linked immunoassay new system has extremely high sensitivity. HRP can be measured with a detection limit of 6.0×1010 g/L and a linear r... Theo-aminophenol (OAP)-H2O2-horseradish peroxidase (HRP) voltammetric enzyme-linked immunoassay new system has extremely high sensitivity. HRP can be measured with a detection limit of 6.0×1010 g/L and a linear range of 1.0×10-9-4.0×10-6 g/L. The pure product of H2O2 oxidizing OAP catalyzed by HRP was prepared with chemical method. The enzyme-catalyzed reaction has been investigated with electroanalytical chemistry, UV/Vis spectrum, IR spectrum,13C NMR,1H NMR, mass spectrum, elemental analysis, etc. Under the selected enzyme-catalyzed reaction conditions, the oxidation product of OAP with H2O2 catalyzed by HRP is 2-aminophenoxazine-3-one. The processes of the enzyme-catalyzed reaction and the electroreduction of the product of the enzymecatalyzed reaction have been described. 展开更多
关键词 o-aminophenol HORSERADISH PEROXIDASE VOLTAMMETRY enzyme-catalysis electrochemical immunoassay.
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