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The depolymerization of sodium alginate by oxidative degradation
Pharmaceutical Development and Technology, 2011Alginate has been extensively used as a carrier for macromolecules and as gene delivery vehicle. Both properties are molecular weight (Mw) dependent. Herein, we investigated factors affecting the oxidative depolymerization of alginate. The depolymerization process occurred mainly in the first 1 h.
Shirui, Mao +3 more
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Depolymerization of Poly(2,6‐dimethyl‐1,4‐phenylene oxide) under Oxidative Conditions
Chemistry – A European Journal, 2003AbstractDepolymerization of an engineering plastic, poly(2,6‐dimethyl‐1,4‐phenylene oxide) (PPO), was accomplished by using 2,6‐dimethylphenol (DMP) under oxidative conditions. The addition of an excess amount of DMP to a solution of PPO in the presence of a CuCl/pyridine catalyst yielded oligomeric products.
Kei, Saito +3 more
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Oxidative Depolymerization of Chitosan by Hydroxyl Radical
Bioscience, Biotechnology, and Biochemistry, 1996Oxidative depolymerization of chitosan induced by oxygen radical-generating systems was studied. Chitosan, but not chitin, was susceptible to oxidative depolymerization by hydroxyl radical generated through Cu(II)–ascorbate and ultraviolet–H2O2 systems in time- and concentration-dependent manners.
Shinichiro Tanioka +7 more
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Magnesium Oxide‐catalyzed Oxidative Depolymerization of
Empty fruit bunch (EFB) lignin, which had been isolated by the previous sulfuric acid treatment of EFB, was oxidized in the presence of a base and air to depolymerize the solvent‐insoluble lignin into smaller solvent‐soluble molecules. Depending on the types of base and solvent, the yield of solvent‐soluble lignin (SSL) varied, and the highest yield of
Vania Tanda Widyaya +3 more
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ChemInform Abstract: ANIL FORMATION BY OXIDATIVE DEPOLYMERIZATION
Chemischer Informationsdienst, 1973AbstractWird das Oligomere (I) und Mesidin (IIa) in Benzol drei Tage in Gegenwart von Natriumbismutat gerührt, so erhält man das Anil (IIIa) (87%) und Azomesidin (IVa) (7%).
E. KON, E. MCNELLS
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Formic-acid-induced depolymerization of oxidized lignin to aromatics
Nature, 2014Lignin is a heterogeneous aromatic biopolymer that accounts for nearly 30% of the organic carbon on Earth and is one of the few renewable sources of aromatic chemicals. As the most recalcitrant of the three components of lignocellulosic biomass (cellulose, hemicellulose and lignin), lignin has been treated as a waste product in the pulp and paper ...
Alireza, Rahimi +3 more
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Depolymerization of cellouronic acid during TEMPO-mediated oxidation
Cellulose, 2003The mechanism of partial depolymerization of cellouronic acid (β-1,4-linked polyglucuronic acid sodium salt) during 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-mediated oxidation of cellulose was studied by treating cellouronic acid with one reagent or a combination of TEMPO-NaBr-NaClO under various conditions.
Izumi Shibata, Akira Isogai
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Depolymerization during nitroxide‐mediated oxidation of native cellulose
Journal of Applied Polymer Science, 2007AbstractThe kinetics and mechanism of depolymerization during nitroxide‐mediated oxidation of native cellulose has been studied under various conditions. The physical heterogeneity of the native cellulose and its complicated hypermolecular and supramolecular structure exerts a remarkable influence on the kinetics of oxidation and depolymerization.
Miloslav Milichovsky +2 more
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Depolymerization of cellulose to glucose by oxidation–hydrolysis
Green Chemistry, 2015An oxidation–hydrolysis strategy was developed for depolymerization of cellulose. The method needs no additional catalyst. Part of the hydroxymethyl groups on glucose units were oxidized to carboxyl groups during the preoxidation treatment, and the generated acid sites act as the catalytic active centers for the following depolymerization of cellulose.
Lipeng Zhou +6 more
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Oxidative depolymerization of lignin using nitric acid under ambient conditions
Industrial Crops and Products, 2021Abstract In this work, we demonstrated an innovative and cost-effective strategy to produce high- value depolymerized kraft lignin (DKL) from softwood kraft lignin (SKL) and hardwood kraft lignin (HKL). The depolymerization of kraft lignin was successfully achieved by an oxidative approach using nitric acid under ambient conditions (room temperature ...
Zaid Ahmad +2 more
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