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Items for "ozonation"

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

Elucidation of the structure of cellulolytic enzyme lignin

Cellulolytic enzyme lignin (CEL) and milled wood lignin (MWL) were prepared by three different ball-milling methods...

Keywords: cellulolytic enzyme lignin (CEL), effect of ball milling, method of lignin isolation, ozonation, quantitative 13C NMR spectroscopy

07/2006 | 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