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Items for "nitrobenzene oxidation"

Erythro/threo ratio of ?-O-4-5 structures as an important structural characteristic of lignin. Part 4: Variation in the erythro/threo ratio in softwood and hardwood lignins and its relati

The proportion of erythro- and threo-forms of ?-O-4-structures in lignin was elucidated by ozonation analysis of 21 wood species, and the relationship to the syringyl and guaiacyl composition was investigated...

Keywords: ?-O-4 structure, erythro/threo ratio, hardwood, Klason lignin, lignin, methoxyl, nitrobenzene oxidation, ozonation, softwood, stereochemistry, syringyl/guaiacyl ratio

05/2005 | Holzforschung, Walter de Gruyter

Morphological and chemical variations between juvenile wood, mature wood, and compression wood of loblolly pine (Pinus taeda L.)

To better understand the within-tree variations between juvenile wood, mature wood, and compression wood, wood from a 35-year-old mature bent loblolly pine was separated into seven groups by different positions in the tree...

Keywords: cellulolytic enzyme lignin (CEL), compression wood, crystallilte dimension, fiber quality analysis (FQA), juvenile wood, loblolly pine (Pinus taeda), mature wood, Microfibril angle, nitrobenzene oxidation, NMR spectroscopy, ozonation, sugar analysis, X-ray diffraction

01/2006 | Holzforschung, Walter de Gruyter

The influence of lignin chemistry and ultrastructure on the pulping efficiency of clonal aspen (Populus tremuloides Michx.)

The variation in wood chemistry among aspen clones of similar age, harvested from a common site in northern British Columbia, Canada, was evaluated...

Keywords: aspen, delignification, guaiacyl lignin, kraft pulping, lignin, molecular mass, MWL, MWELsol, MWELinsol, NMR, nitrobenzene oxidation, quantitative NMR, syringyl lignin, thioacidolysis

03/2006 | Holzforschung, Walter de Gruyter

Comparison of morphological and chemical properties between juvenile wood and compression wood of loblolly pine

In conifers, juvenile wood (JW) is always associated with compression wood (CW). Due to their similar properties, there is a common belief that JW is the same as CW...

Keywords: C9 formula, compression wood, fiber quality analysis (FQA), juvenile wood, light microscopy, loblolly pine (Pinus taeda), nitrobenzene oxidation, ozonation, sugar analysis

11/2005 | Holzforschung, Walter de Gruyter

Soda-AQ delignification of poplar wood. Part 2: Further degradation of initially dissolved lignins

Degraded lignin fragments dissolved in pulping liquor during the soda AQ pulping of poplar (Populus deltoides) wood with a flow through reactor were divided in two fractions...

Keywords: carbohydrates, delignification, deposition of xylans on fibers, nitrobenzene oxidation, permanganate oxidation, poplar wood, reactions of lignin fragments, soda-AQ pulping

11/2008 | Holzforschung, Walter de Gruyter