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Parpot, Píer; Bettencourt, Ana Paula; Carvalho, M. Alice; Belgsir, E.M.

doi:10.1023/a:1004003613883

Cited by 124 publications

(107 citation statements)

References 5 publications

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“…Rochefort et al [11] also investigated the mechanism of oxidation of DMP and the cleavage of the a À b carbon bond in aqueous buffer and reported the products as being benzaldehyde and veratraldehyde (methylvanillin), verified in another study by Parpot et al in 1.0 M NaOH [12] and Limosin and co-workers, also in aqueous base [13]. More recently, the electrochemical characterisation of adsorbed lignin was investigated in H 2 SO 4 ; the authors reported the one electron oxidation of the phenol group (Ph À OH) to form the phenoxyl radical (Ph À O .…”

Section: Introductionmentioning

confidence: 87%

Abrasive Stripping Voltammetric Studies of Lignin and Lignin Model Compounds

2010

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Lignin is potentially a major renewable, nonfossil source of aromatic and cyclohexyl compounds. In this study, we have investigated the abrasive stripping voltammetry of lignin and four lignin model compounds in the room temperature ionic liquids (RTILs) [C 4 À ¼ trifluoromethanesulfonate) on a gold macrodisk and in 0.1 M H 2 SO 4 and 0.1 M NaOH on a boron-doped diamond (BDD) macroelectrode, with the hope of using the voltammetry to fingerprint the functional groups within the lignin molecule. The use of RTILs on metal electrodes, or either acidic or basic media in combination with BDD electrodes allows solvent systems with wide electrochemical potential windows, useful for studying voltammetry which may be difficult to observe in systems where early breakdown of the solvent occurs.

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Section: Introductionmentioning

confidence: 87%

Abrasive Stripping Voltammetric Studies of Lignin and Lignin Model Compounds

2010

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“…Several attempts have been made to oxidise lignins electrochemically [15,9,16]. Oxidation of a lignin (unspecified) at a boron doped diamond anode at pH \ 11 represents a new approach, but little information is available, especially about yields of vanillin and related products [17].…”

Section: Introductionmentioning

confidence: 99%

Electro-organic reactions. Part 60[1]. The electro-oxidative conversion at laboratory scale of a lignosulfonate into vanillin in an FM01 filter press flow reactor: preparative and mechanistic aspects

Smith

Utley

Hammond³

2010

J Appl Electrochem

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The electrochemical conversion of a spruce lignosulfonate into vanillin, at nickel anodes, was explored in previously unobtainable detail. A flow reactor (FM01), in a rig that permitted considerable variation of electrolysis conditions, allowed up to 150 g to be electrolysed at up to12 A at a variety of electrode configurations. Samples taken during electrolysis gave detailed reaction profiles. The electrolyser operated at 145°C/500 kPa/3 M NaOH and yields of vanillin were similar to those obtained industrially using chemical oxidants (about 5-7% w/w). Vanillin production was favoured by low current density and low initial concentration of lignosulfonate. Vanillin, alone, was consumed in a 2.7 F process under the above conditions. Historically, yields in chemical and electrochemical conversions of lignins into vanillin do not exceed 10%; the results herein explain this apparent limit as equilibrium between formation of vanillin, its concomitant oxidative destruction and further condensation of lignins.

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“…Lignin was found to undergo a variety of electrochemical reactions both during oxidation and reduction. For instance, Parpot et al described oxidative degradation of Kraft lignin on different electrodes and identified vanillin as the main product [10]. Limosin et al observed cleavage of benzene lings and increasing carboxylic group content during lignin oxidation in the presence of ferrocyanide as an electron carrier [11].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of a Lignin Modified Electrode

Milczarek

2007

Electroanalysis

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Alkali lignin undergoes strong adsorption on polycrystalline gold electrodes. Subsequent oxidation in a sulfuric acid solution leads to a restructured redox-active polymer that shows features characteristic for surface confined species. Surface coverage of up to 4.40 Â 10 À10 mol cm À2 may be obtained depending on the adsorption time or lignin concentration in the adsorption solution. Using Lavirons approach the electron-transfer rate constant and the transfer coefficient were found to be 8.9 s À1 and 0.35, respectively. The formal potential of the redox couple shifted negatively with pH at a rate of ca. 60 mV/pH unit, suggesting a 2 e/2 H þ reaction. The redox couple was also found to be a good mediator for electrochemical ascorbic acid oxidation in neutral phosphate buffer with ca. 250 mV reduction of the oxidation overpotential.

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Untitled

Cited by 124 publications

References 5 publications

Abrasive Stripping Voltammetric Studies of Lignin and Lignin Model Compounds

Abrasive Stripping Voltammetric Studies of Lignin and Lignin Model Compounds

Electro-organic reactions. Part 60[1]. The electro-oxidative conversion at laboratory scale of a lignosulfonate into vanillin in an FM01 filter press flow reactor: preparative and mechanistic aspects

Preparation and Characterization of a Lignin Modified Electrode

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