Extractives and structural components in wood and bark of endemic oak Quercus vulcanica Boiss

The bark and wood of an endemic oak species in Turkey, Q. vulcanica, were i nvestigated with regard to main components, phenolics as well as extractive s. About 66 % of extract free wood consists of polysaccharides, i.e. cellul ose and polyoses. Heartwood was found to be rich in ellagitannins, while in bark proanthocyanidins occurred in larger amounts. Extractives soluble in cyclohexane were divided into saponifiables and neutrals. Among saponifiabl es saturated acids made up the majority, while sterols and nonsteroidal tri terpenes were the predominating compounds of the neutral fraction.