THE SIBERIAN LARCH GROUP COMPOSITION AND ACID NEEDLES AT DIFFERENT VEGETATION PERIODS
UDC 634.0.813.2
Abstract
The research results of the Siberian larch needle extractives are presented in paper. The content of extractive substances from green and yellow needles extracted by organic solvents with different polarities is determined. It is found out that the double increase of the yellow needle extractive substances content soluble in hydrocarbon extractant is observed, whereas it is decreased by 30 per cent when extracted with propan-2-ol. The group composition of needle extracts derived from isopropanol extract by petroleum ether is determined. The neutral substances content in both needle collections is practically the same, although the yellow needles contain less acid “bound” in the form of esters. There is a high content of waxes in the needles, which mainly consist of secondary nonacosanol-10 alcohol.
The composition of free and “bound” acids in Siberian larch needles of different vegetation periods is established. The needles are dominated by groups of higher unsaturated C-18 fatty acids. Resin acids are represented by isopimaric acid (isopimaric and sandaracopimaric) and abietic acids: abietic, dehydroabietic and levopiric acids. In yellow needles, the content of dehydroabietic acid is increased quadrupled and the hydroxy acids are identified: 15-hydroxyabietic acid and 15-hydroxyhydroabietic acid. The tri- and tetraenic C-20 acids are identified among higher fatty acids.
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