In this study we researched the content of proanthocyanidins in beech wood. The trees were cut down in the Kočevski Rog forest. We cut down the trees in a way that enabled us to get all necessary tissues for further research. At first, we cut the reels, which were then sawn, milled and dried. Next, we extracted the resulting samples, we performed two extractions. Firstly we performed the Soxhlet extraction, which enabled us to measure the content of all substances soluble in mixture of methanol and water, and the content of hydrophilic extracts. Next, we performed the diethyl ether extraction. This method enabled us to trace the lipophilic extracts. The content of proanthocyanidins was measured using the UV-Vis spectrophotometry. Our research showed that the highest amount of lipophilic extracts can be found in samples of wounded wood tissue, dead and alive tree knots. The lowest amount of lipophilic extracts was tracked in the red heart. The highest amount of hydrophilic extracts was again found in dead and alive tree knots, while the lowest was again found in the red heart. The highest content of total extractible substances were found in live knots, the lowest, again in red heart. We traced the highest amount of proanthocyanidins in dead tree knots, followed by alive tree knots. The lowest content of proanthocyanidins was found in the red heart. In all cases the samples of the red heart had the lowest amount of traced substances
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