Akademik Veri Yönetim Sistemi
HOLZ ALS ROH-UND WERKSTOFF, cilt.53, sa.4, ss.273-275, 1995 (SCI-Expanded)
Wood and bark from Abies nordmanniana were studied for chemical composition of the extractives. The wood contained very low amounts of lipophilic and polar components. The lipophilic fraction of the extractives was composed of fatty acids, resin acids, alcohols and sterols, and the polar fraction was composed of monosaccharides and lignans. The bark contained very high amounts of lipophilic and polar components in comparison with the wood. The composition of lipophilic fraction did not significantly vary from the respective wood extract. Glycerol, gallic acid, sucrose, catechin isomers, gallocatechin isomers were identified in addition to monosaccharides and lignans among numerous components of the polar fraction of the bark. Successive extractions with benzene, ether, hot water and ethanol amounted up to 30% of the bark. Total solubles exceeded 50% of the bark by the treatment of the extractive-free bark with 1% hot NaOH. There were no significant differences between the samples prepared from young and old trees for the yields of the consecutive extractions and 1% NaOH solubility. However, Stiasny number determined as a measure of the phenol content (condensed tannins) was found to be much higher in the old samples than in the young ones.