Content of biologically active substances in betula pendula bark in the novosibirsk region

 The main groups of biologically active substances contained in the bark of Betula pendula were determined by the spectrophotometric method: triterpene saponins, coumarins, hydroxycinnamic acids, tannins. It was found that the place of growth affects the content of triterpene saponins. There is an increase in their content from the anthropogenic load. A comparative analysis of the quantitative content of coumarins in samples of birch bark showed the similarity of indicators, so we can conclude that the place of growth does not significantly affect the content of coumarins. Studies have shown that all the samples under study accumulate approximately the same amount (about 1.5 %) of hydroxycinnamic acids. The difference between the content of the studied substances is small, but it exists. Studies of the content of tannins found that the place of growth of the hanging birch does not significantly affect this indicator. But with the increase in anthropogenic impact, we can note an increase in the content of this group of BAS. The study of the content of amino acids showed that the area of growth of the hanging birch affects their content in the bark. Anthropogenic factors also affect the content of amino acids, with an increase in the anthropogenic load on the growing area, the content of amino acids becomes higher.