Lignin molecular weight distribution

Acetylated lignins, molecular weight distribution, 87,89-94/951,96 Acetylation, effect on lignin solubility, 284... [Pg.529]

T. I. Obiaga, "Lignin Molecular Weight and Molecular Weight Distribution during Alkaline Pulping of Wood," Ph.D. thesis. University of Toronto, Canada, 1972. [Pg.146]

Figure 11. Molecular weight distributions of middle molecular weight phenolic (solid line) and acidic (broken line) fractions from methanol extract, and higher molecular weight acidic (dotted line) fraction from subsequent aqueous 96% dioxane ract, of spruce wood chips degraded by P, ckrysosporium to 20% loss in lignin content Sephadex LH60A).10 M LiQ-DMF profiles adapted and redrawn from reference 67.

$Figure 11. Molecular weight distributions of middle molecular weight phenolic (solid line) and acidic (broken line) fractions from methanol extract, and higher molecular weight acidic (dotted line) fraction from subsequent aqueous 96% dioxane ract, of spruce wood chips degraded by P, ckrysosporium to 20% loss in lignin content Sephadex LH60A).10 M LiQ-DMF profiles adapted and redrawn from reference 67.$

Two Streptomyces strains, S. badius and S. viridosporus, were found to be able to grow on kraft lignin (In-dulin ATR) as sole carbon source. The resulting APPL (Acid Precipitable Polymeric Lignin) was characterized by FTIR and elemental analysis for C, H and N, and was found to contain proteins in addition to a relatively demethoxylated lignin component. The proteins were further characterized by amino acid analysis, while the lignin component was separated by solvent extraction and its molecular weight distribution determined by HPSEC. [Pg.529]

Molecular Weight Distribution of Aspen Lignins Estimated by Universal Calibration... [Pg.89]

This study describes the application of differential vis-cometry as a GPC detector to the problem of determining molecular weight distributions of acetylated hardwood lignins in tetrahydrofuran. Molecular weight distributions of ball-milled, organosolv, alkali-extracted/mild acid hydrolyzed, and alkali-extracted/steam exploded aspen lignins were estimated using universal calibration. [Pg.89]

Low molecular weight lignin model compounds (synthetic phenyl-tetramers and Igepals ) were found to fit universal calibration. Fractions from preparative GPC, when analyzed by universal calibration, yield molecular weight distributions which add to a similar value to that found for the unfractionated parent sample. [Pg.89]

In any structure/property studies on potential applications of lignins, an important parameter is the molecular weight and molecular weight distribution (MWD). In recognition of this fact, a substantial number of papers... [Pg.107]

Molecular Weight Distribution Studies Using Lignin Model Compounds... [Pg.116]

Determinations of Average Molecular Weights and Molecular Weight Distributions of Lignin... [Pg.141]

FROMENT PLA Lignin Molecular Weights Weight Distributions 135... [Pg.142]

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