SEASONAL CHANGES IN THE COMPOSITION OF SCOTS PINE (PINUS SYVESTRIS L.) OLEORESIN MEASURED BY THE NMR METHOD

Analysis of seasonal changes in the composition Scots pine oleoresin by 1H and 13C NMR spectroscopy was carried out. Due to favorable weather conditions (positive temperatures on days sampling throughout year) samples for each 12 months were obtained studied. Chloroform (CDCl3) solutions Eight resin acids identified quantified: abietic, dehydroabietic, isopimaric, levopimaric, neoabietic, palustric, pimaric sandaracopymaric, also 6 monoterpenes: camphene, limonene, myrcene, α-pinene, β-pinene terpinolene. It found that amount α-pinene contained it decreased at low temperatures. At same time other monoterpenes not detected within measurement error. supposed formed smaller amounts during period pests' anabiosis, play main role control coniferous insect pests. content pimaric, sandaracopymaric varied insignificantly year. The relationship between levopimaric palustric found. observed caused low-temperature catalytic reactions acid isomerization with formation abietic mainly. suggested these processes should be taken into account exclude errors determining above even case statistical analysis.