Electrochemical study in both classical cell and microreactors of flavin adenine dinucleotide as a redox mediator for NADH regeneration

The electrochemical reduction of flavinadeninedinucleotide (FAD) is studied in a classical electrochemical cell as well as in two types of microreactors: the first one is a one-channel reactor and the other one, a multichannel filter-press reactor. The ultimate goal is to use the reduced form of flavin (FADH2), in the presence of formate dehydrogenase (FDH), in order to continuously regenerate the reduced form of nicotinamide adeninedinucleotide (NADH) for chiral syntheses. Various voltammetric and adsorption measurements were carried out for a better understanding of the redox behavior of the FAD as well as its adsorption on gold. Diffusivity and kinetic electrochemical parameters of FAD were determined

Study of the Histamine Electrochemical Oxidation Catalyzed by Nickel Sulfate

Thin layer technique was applied to the indirect anodic oxidation of histamine, catalyzed by NiSO4. Coulometric determination of the electron number demonstrates that histamine complexes Ni(II) and resulting adducts can be electrochemically oxidized in a single‐electron reaction, to lead Ni(III)‐histamine. The system Ni(III)/Ni(II) acts as ‘redox mediator’ for histamine oxidation. The equilibrium constant of the Ni(II)‐histamine complex formation was 106 , value showing the strong affinity between species. High content of histamine (>0.1 M), detected in fresh fish (previously exposed to the sun) extracts, showing potentialities for future design of a sensor for direct measurement in fish

HLADH-catalyzed synthesis of β-amino acids, assisted by continuous electrochemical regeneration of NAD+ in a filter press microreactor

This work focuses on the use of electrochemical microreactors, applied to the direct electroregeneration of nicotinamide dinucleotide (NAD+) used in-situ for the enzymatically-assisted oxidation of the β-alanine. Mechanistic and chemical/electrochemical reactor approaches were investigated, to achieve satisfactory conversions (>80%) of the substrate in reasonable (1–2 days) reaction times; no fouling observed of the gold anode. An original method was proposed to limit the complexation effect of the produced β-alanine to the enzyme. Simulations of the overall system were achieved and an estimation of the required kinetic and Michaelis constants was proposed

Electrocoagulation process applied on pollutants treatment- experimental optimization and fundamental investigation of the crystal violet dye removal

The removal crystal violet (CV) from wastewater solutions was performed by electrocoagulation process based on an aluminum sacrificial anode. The effect of the operating parameters was experimentally investigated; a complete removal was achieved after 1 h electrolyses, and various ‘short times’ electrolyses were carried out to fundamentally investigate the main physical phenomena conditioning the flocs formation and allowing to achieve satisfactory coagulation rates. A simplified theoretical model was proposed to predict the dye removal rate and to design an electrochemical reactor. It is based on a mechanism, involving Al(OH)3 oligomers formation, and competition between electrochemical oxidation and coagulation rate. The good agreement between simulation and experiments, allows i) the required kinetic constant value to be determined and ii) the limiting step to be defined as a reaction involving one Al(OH)3 fixating 4 molecules of the crystal violet. The presented results may be easily extrapolated to other dyes removal

Paths to Success: The relationship between Health and Education In developing countries

(Statement of Responsibility) by Cheikhou Akhmed Kane(Thesis) Thesis (B.A.) -- New College of Florida, 2018RESTRICTED TO NCF STUDENTS, STAFF, FACULTY, AND ON-CAMPUS USEOnline version not currently available.(Bibliography) Includes bibliographical references.This bibliographic record is available under the Creative Commons CC0 public domain dedication. The New College of Florida Libraries, as creator of this bibliographic record, has waived all rights to it worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law.Faculty Sponsor: Collins, Tracy; Yildirim, Necmetti

Conception et réalisation de microréacteurs électrochimiques (application à la régénération électroenzymatique de NADH et potentialités en synthèse)

TOULOUSE3-BU Sciences (315552104) / SudocSudocFranceF

Aqueous extraction of anthocyanins from Hibiscus sabdariffa: Experimental kinetics and modeling

International audienc

A study on the variation of nutritional profiles of seaweeds along the Senegalese coast

International audienc

A study on the variation of nutritional profiles of seaweeds along the Senegalese coast

International audienc