Home – Home – Jornals – Chemistry for Sustainable Development 2024 number 2

The dynamics of the composition of biomolecules in the leaves of Caragana arborescens and Sorbus aucuparia shrubs, typical of the South taiga natural climatic zone, was studied by gas chromatography - mass spectrometry in the process of post-pyrogenic restoration at the territory near the Golovina village, the Tomsk Region, 3 months, 1 year and 2 years after the fire event. Acyclic organic compounds have been identified: n -alkanes, fatty acids, n -alkane-2-ones, aldehydes, n -alkanols. The long-chain saturated alcohol 10-nonacosanol was found in the leaves of Sorbus aucuparia . Aliphatic diterpenoids phytone and the isomers of phytol, triterpene squalene, as well as naphthenoaromatic compounds vitamin E (tocopherol) and vitamin K1 (phytanodione) were detected among isoprenoid structures in the leaves of S. aucuparia , increased phytol and fatty acid levels are observed in the leaves of S. aucuparia 3 months and 1 year after the fire event, and then the concentrations of these compounds decrease to background values after 2 years. Squalene content in the leaves of S. aucuparia , which decreased as a result of the fire event, increased sharply the following year, and after 2 years, it still remained at a level significantly higher than the background. The fire had the greatest impact on the long-chain alcohol 10-nonacosanol, which was detected in large amounts in the leaves of S. aucuparia . As a result of the fire, there is a drop in its content to trace amounts, followed by a slight increase the following year and an abrupt increase up to background values after 2 years. During the two-year-long post-pyrogenic restoration, changes in the molecular mass distribution of acyclic compounds are observed. The leaves of S. aucuparia, sampled 3 months and the following year after the fire, exhibited a shift from higher molecular homologues to less higher molecular n- alkanes and n- aldehydes in comparison with the leaves from background sites, while the corresponding shift observed in C. arborescens related to n- alkane-2-ones. The distribution of acyclic compounds in the post-pyrogenic area approaches the background level 2 years after the fire.