The solubility of Turkey Oak (Quercus cerris l.) wood in water


1Faculty of Biotechnology and Food, Department of Chemistry, Agricultural University of Tirana Koder Kamez, AL-1029
Tirana, Albania

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Albania has an area of 28,748 km2 where forest cover occupies an area of 1.5 million hectares. Coppice forests dominated by oaks occupy an area of 623,799 hectares. There are many types of oak in Albania, but the species that have the greater spread and the largest area are: Turkey oak (Quercus cerris. L) and Hungarian oak (Quercus frainetto Ten). Now days, turkey oak is being used in many wine barrels in Albania. The main components of wood parts, soluble in cold water, consist of carbohydrates, proteins, and inorganic salts. Tannins and some polyoses are soluble in hot water. The study was carried out in six sites along longitudinal gradient. Three stem discs from the bole R1, middle R2 and top R3 of the stem were taken from each tree. For solubility in cold water, the extraction conducted at 23 ± 2°C with constant mixing for 48 hours. For solubility in hot water a reflux condenser was attached to the flask and the apparatus was placed in a gently boiling water bath for three hours. The amounts of water-soluble components differed significantly in different parts of the same tree. Average values of wood solubility, in cold water (SCW %), on discs at the base of the trunk (R1), for the analyzed samples, from all stations, resulted Mean of SCW = 7.0 ± 1.83%, while for solubility in hot water (SHW %) resulted Mean of SHW= 9.68 ± 2.57%.

Keywords: turkey oak, solubility, extractives, wood, stem.

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