Khalaf Ali Fayez Abuamra

استاذ - أستاذ متفرغ

كلية العلوم

العنوان: قسم النبات والميكروبيولوجى -كلية العلوم -جامعة سوهاج



المنشورات و المؤلفات التي تحتوي علي الكلمة المفتاحية: Cyclic voltammetry

2018-10-30 19:53:33 الكلمات المفتاحية macrocycles, cobalt complexes, Cyclic voltammetry,
Electrochemistry of the Bis(1,4,7-triazacyclodecane) Cobalt(III) complex and its role in the catalytic reduction of hydrogen
The electrochemistry of the bis(1,4,7-triazacyclodecane) cobalt(III) complex at a mercury electrode, HMDE, in aqueous Britton–Robinson buffer solutions was investigated using cyclic voltammetry, double-potential-step chronoamperometry and chronocoulometry. The cyclic voltammetric data were analyzed by digital simulation to confirm and to measure the heterogeneous and homogeneous parameters for the suggested electrode mechanism. Generally, the complex is electrochemically reduced giving rise to two ... إقراء المزيد

2018-10-12 14:30:32 الكلمات المفتاحية Peanut hulls, Carbon black, Luteolin, Square wave voltammetry, Adsorptive, Cyclic voltammetry,
Electroanalytical Determination of Luteolin in Peanut Hulls Using Carbon Black Modified Glassy Carbon Electrode
The main objective of this research was to develop a simple and sensitive electrochemical method for determination of trace-level of luteolin using vulcan carbon black (VCB) modified glassy carbon electrode (GCE). Compared with the bare GCE, the VCB/GCE exhibits higher electrocatalytic ability toward luteolin oxidation. This is due to the large surface-to-volume ratio of the carbon black together with the ... إقراء المزيد

2018-10-12 14:34:29 الكلمات المفتاحية Gallic acid, Epinephrine, Polyepinephrine, Cyclic voltammetry, Square wave voltammetry,
Adsorptive Stripping Voltammetric Determination of Gallic Acid Using an Electrochemical Sensor Based on Polyepinephrine/glassy Carbon Electrode and its Determination in Black Tea Sample
An efficient adsorptive stripping voltammetric (AdSV) method for determination of gallic acid, GA, was developed by using an electrochemical sensor based on polyepinephrine/glassy carbon electrode, PEP/GCE. Modification of GCE with PEP was done by electropolymersation of epinephrine, EP, in 0.2 M phosphate buffer solution using cyclic voltammetry, cv. A well-defined redox cv wave of epinephrine in potential range of -0.10 ... إقراء المزيد

2018-10-13 05:20:28 الكلمات المفتاحية Quercetin, Cyclic voltammetry, Chronocoulometry, Digital simulation,
Electrochemical behaviour of antioxidants: Part 2. Electrochemical oxidation mechanism of quercetin at glassy carbon electrode modified with multi-wall carbon nanotubes
Electrochemical oxidation mechanism of quercetin was investigated at glassy carbon electrode modified with multi-wall carbon nanotubes in aqueous 0.2 M phosphate solutions with different pHs. The investigation was carried out using cyclic voltammetry, double potential step chronoamperometric and chronocoulometric techniques. It was found that the oxidation mechanism proceeds in sequential steps, related with the five-hydroxyl groups in the three aromatic ... إقراء المزيد

Electrochemical behavior of antioxidants: I. Mechanistic study on electrochemical oxidation of gallic acid in aqueous solutions at glassy-carbon electrode
Mechanism of electrochemical oxidation of gallic acid in aqueous phosphate buffer solutions of different pH’s was studied at glassy-carbon electrode. The study was performed using cyclic, convolution–deconvolution sweep voltammetry, chronoamperometry and chronocoulometry. It gives two irreversible diffusion-controlled cyclic voltammetric waves at the entire range of pH. The electrochemical oxidation mechanism was proposed to be an ECEC-first order mechanism in which ... إقراء المزيد

2018-10-05 19:19:55 الكلمات المفتاحية Cyclic voltammetry, Electrochemical behavior, analogous arylazo, azo compounds, aliz arin yellow R, ,
Cyclic Volta Metric Study of Alizarin Yellow R and Some Analogous Arylazo Compounds in DMF and in Aqueous Media
The Cyclic Voltammetry (CV) was used to investigate the electrochemical behavior ofalizarin yellow R and some analogous arylazo compounds having almost the same central azo group. For this purpose, the substances chosen for the measurements are Alizarin Yellow R (AYR), Eriochrome Black T (EBT) and Sudan II (SUD II). The investigations were carried out at room temperature (298 K) in ... إقراء المزيد

Some new nano-sized Cr(III), Fe(II), Co(II), and Ni(II) complexes: Structural characterization, electrochemical, antioxidant, antimicrobial, antiviral assessment and DNA interaction
To estimate the biological preference of synthetic small drugs towards DNA target, new metal based chemotherapeutic agents of nano-sized Cr(III), Fe(II), Co(II) and Ni(II) Schiff base complexes having N,N,O donor system were synthesized and thoroughly characterized by physic-chemical techniques. The redox behavior of the Cr(III), Fe(II) and Co(II) complex was investigated by electrochemical method using cyclic voltammetry. IR results proven ... إقراء المزيد

2018-08-28 16:49:57 الكلمات المفتاحية Cyclic voltammetry, Electrolysis, Oxidation Mechanism, Eriodictyol, Glutathione conjugates,
Mechanistic Pathways and Identification of the Electrochemically Generated Oxidation Products of Flavonoid Eriodictyol in the Presence of Glutathione
The metabolic oxidation pathways of dietary flavonoid eriodictyol (Er) are not very well-probed. In the present work, the electrochemical oxidation behavior of Er was studied in aqueous Britton-Robinson (B-R) buffer solution using cyclic voltammetry (CV), chronoamperometry (CA), and bulk-electrolysis (BE). The oxidation products and reaction pathways of Er in the absence and the presence of glutathione (GSH) were proposed and ... إقراء المزيد

2018-08-29 07:26:51 الكلمات المفتاحية Glutathione conjugates, Chicoric acid, Oxidation Mechanism, Electrolysis, Cyclic voltammetry,
Mechanism of Chicoric Acid Electrochemical Oxidation and Identification of Oxidation Products by Liquid Chromatography and Mass Spectrometry
Electrochemical oxidation of chicoric acid (ChA) was investigated using cyclic voltammetry and chronoamperometry at a glassy carbon electrode. Chicoric acid generates single quasi‐reversible redox wave in cyclic voltammetry over a wide pH range, and an ECEC‐dimerization mechanism is proposed. Effect of glutathione (GSH) on the electrochemical oxidation of chicoric acid (ChA) was investigated in Britton−Robinson buffer solution. Ultra‐high performance liquid ... إقراء المزيد