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NMR Analysis of Oxidative Alkaline Extraction Stage Lignins
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Troy M. Runge
Published/Copyright:
June 1, 2005
Summary
Chlorine dioxide delignified pulp was subjected to various oxidative alkaline extraction stages (EAr, E, EO, EP, and EPO) from which the residual and effluent lignins were isolated and characterized by 1H and 13C NMR. Results of the NMR analyses indicate an increase in unconjugated carboxyl content of the lignins with the alkali treatment; a decrease in phenolic and formyl groups with oxidant reinforcement, especially oxygen; and an enrichment in aromatic methoxyl groups with increasing amount of oxidant reinforcement. The alkaline extracted pulps were further treated to a second chlorine dioxide stage from which the residual lignins were extracted and analyzed by 1H NMR. Significant structural differences were noted between the various oxidative E stage and D1 stage lignins.
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Published Online: 2005-06-01
Published in Print: 1999-11-11
Copyright © 1999 by Walter de Gruyter GmbH & Co. KG
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Articles in the same Issue
- Subject Index
- Author Index
- Species Index
- Contents
- Production of Polygalacturonase and Increase of Longitudinal Gas Permeability in Southern Pine by Brown-Rot and White-Rot Fungi
- Components of Steamed and Non-Steamed Japanese Larch (Larix leptolepis (Sieb. et Zucc.) Gord.) Heartwood Affecting the Feeding Behavior of the Subterranean Termite, Coptotermes formosanus Shiraki (Isoptera: Rhinotermitidae)
- Effect of Soluble Nutrient Content in Wood on its Susceptibility to Soft Rot and Bacterial Attack in Ground Test
- Carboxylic Acids of Moroccan Pinus Pinaster Bark Extract
- What Factors Control Dimerization of Coniferyl Alcohol?
- Atmospheric Acetic Acid Pulping of Rice Straw IV: Physico-Chemical Characterization of Acetic Acid Lignins from Rice Straw and Woods. Part 2. Chemical Structures
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