The main goal of this study was to investigate the amounts of hydrophilic extractives in bark and wood samples of black locust stem (Robinia pseudoacacia L.). Six adult trees were included in the present investigation. Samples were taken from each felled trunk at four different heights. Material was extracted with a mixture of acetone and water, and the hydrophilic extractives were, then, qualitatively and quantitatively analysed. The highest contents of hydrophilic extractives, total phenols, dihydrorobinetin and robinetin were measured in wound-wood and heartwood. The concentrations of extractives were highest in the outermost samples of heartwood. Knotwood of black locust contained less dihydrorobinetin than heartwood. Significantly less hydrophilic compounds were extracted from bark and sapwood samples. This study shows that heartwood of black locust can be considered a source of value-adding compounds. The investigation showed significant variability in the content of extractives in radial direction and less pronounced axial variability within the black locust stems.

中文翻译：

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刺槐茎中亲水性提取物和单个酚类化合物含量的变化

这项研究的主要目的是调查刺槐树皮（刺槐）的树皮和木材样品中亲水性提取物的含量。L.）。本调查包括六棵成年树木。从四个不同高度的每个被砍伐的树干上采集样品。用丙酮和水的混合物萃取物质，然后对亲水性萃取物进行定性和定量分析。伤口木材和心材中的亲水性提取物，总酚，二氢罗宾汀和罗宾汀的含量最高。心材最外层样品中提取物的浓度最高。黑色刺槐的结木所含的二氢罗宾素少于心材。从树皮和边材样品中提取的亲水性化合物少得多。这项研究表明，刺槐的心材可以被视为增值化合物的来源。