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Items for "stereochemistry"

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
Condensed tannins from steamed Acacia mearnsii bark

The optimum steaming conditions for extraction of condensed tannins from Acacia mearnsii bark were explored, after which characterization of proanthocyanidins from bark steamed under optimum conditions was carried out...

Keywords: Acacia mearnsii, condensed tannins, proanthocyanidin dimers, steaming of bark, stereochemistry

05/2005 | Holzforschung, Walter de Gruyter