Metal‐catalyzed oxidation and reduction of carbohydrates

Abbadi, A.; Bekkum, H. van

doi:10.1002/9783527614899.ch3

Cited by 8 publications

(3 citation statements)

References 115 publications

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“…Oxidation Using Pt Catalysis. Oxidation of carbohydrates using Pt catalysis has been studied extensively, , especially the oxidation of sucrose. , Similarly, the oxidation of inulin has been investigated and the reaction is performed preferentially using O 2 as oxidant and Pt as catalyst in the presence of sodium hydroxide …”

Section: Anionic Modificationmentioning

confidence: 99%

Chemical Modification of Inulin, a Valuable Renewable Resource, and Its Industrial Applications

2001

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Inulin, the polydisperse reserve polyfructose from plants such as Cichorium intybus (chicory), has been chemically modified in several ways to obtain industrially important biodegradable compounds. This review provides an insight on the different types of modification (neutral, anionic, and cationic modification as well as cross-linking and slow release applications) and describes its differences from starch and cellulose chemistry. It also highlights the applications of various compounds cited in the literature.

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Section: Anionic Modificationmentioning

confidence: 99%

Chemical Modification of Inulin, a Valuable Renewable Resource, and Its Industrial Applications

2001

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“…[1Ϫ5] For oxidation to uronic acids, stoichiometrically employed reagents such as nitric acid [6] and nitrogen dioxide [6,7] have been developed, as well as catalytic methods: oxygen with noble metal catalysts [3,5,8,9] or stable organic nitroxyl radicals with cooxidants.…”

Section: Introductionmentioning

confidence: 99%

TEMPO‐Mediated Anodic Oxidation of Methyl Glycosides and 1‐Methyl and 1‐Azido Disaccharides

Schämann

Schäfer

2002

Eur J Org Chem

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Methyl glycosides of L‐sorbopyranoside, D‐fructopyranoside, D‐glucosaminopyranoside, 2,3‐dehydro‐2,3‐dideoxyglucopyranoside, cellobiose, lactose, and maltose and the 1‐azido derivatives of glucose, cellobiose, lactose, and maltose have been converted into the corresponding uronic acids in moderate to excellent yields by TEMPO‐mediated anodic oxidation. The anode proves to be an advantageous alternative to other cooxidants in TEMPO+ oxidations of carbohydrates and is compatible with N‐acylamino and azido groups and with double bonds. The electrolyte, a carbonate buffer, can easily be removed with a cation‐exchange resin, a facile scale‐up by increasing the electrode area is possible. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)

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“…Not all researchers agree on the effect of temperature and acidity on the reduction of copper. Zeitsch (2000) suggests that copper complexes form with the sugars produced by oxidation and degradation of the wood, which could be favoured by an increase of the acidity (Abbadi and van Bekkum 1996; Abbadi et al 1998).…”

Section: Introductionmentioning

confidence: 99%

Reduction of copper from dilute acid solutions by hydrolysis of wood carbohydrates

Valenzuela

Becker

Parada

et al. 2021

Mineral Processing and Extractive Metallurgy

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Copper reduction to metallic copper from dilute acid solutions containing Cu +2 was studied by means of sawdust from Radiata Pine as a reducing agent. Influence of the temperature, copper concentration and reaction time on the reduction of copper was investigated using an autoclave reactor. Furthermore, maximum reduction capacity of the sawdust was calculated through consecutive reductions. Results obtained show that diluted acid solutions containing Cu +2 can be effectively reduced to metallic copper by sawdust from Radiata Pine above 120°C. For a 0.5 g L −1 Cu +2 solution at 120°C and in 60 min, close to 90% of the copper can be reduced to metallic copper, which crystalises on the surface of the wood particles. At 120°C and for 90 min reaction time up to 95% of the copper can be reduced, generating an effluent with 0.02 g L −1 of copper. This value is similar to those obtained using activated carbon. Consecutive steps of reductions of the sawdust with fresh solutions with 0.5 g L −1 Cu +2 indicate that for 6 steps, the copper load of the sawdust is about 11.9 kg Cu/ton sawdust (dry basis) while for more concentrated solutions of 16.7 gL −1 Cu +2 the copper load reaches 15.0 kg Cu/ton sawdust. These results indicate that this process could be an alternative to conventional electrowinning.

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Metal‐catalyzed oxidation and reduction of carbohydrates

Cited by 8 publications

References 115 publications

Chemical Modification of Inulin, a Valuable Renewable Resource, and Its Industrial Applications

Chemical Modification of Inulin, a Valuable Renewable Resource, and Its Industrial Applications

TEMPO‐Mediated Anodic Oxidation of Methyl Glycosides and 1‐Methyl and 1‐Azido Disaccharides

Reduction of copper from dilute acid solutions by hydrolysis of wood carbohydrates

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