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Publisher: Altai State University
Journal: Khimiia rastitel'nogo syr'ia (Chemistry of plant raw material)
Languages: Russian
Types: Article
Subjects: Picea obovata Ledeb.; wood; lignans, ель сибирская; корни; древесина; лигнаны
The group and chemical composition of compounds extracted by solvents of various polarity from roots of Siberian Spruce (Picea obovata Ledeb.) have been investigated.The Siberian Spruce roots were selected close toIrkutskcity in September 2015. The extractives were isolated from grinded roots (particle sizes are of 10–15 mm, humidity is 6,1%) by extraction with ethyl acetate at boiling temperature of solvent for an 4 hours, the hydromodule 1 : 10. Resinous substances  were extracted by hexane from the ethyl acetate extracts a method of infusion for an 3 day, the hydromodule 1 : 100. The samples of roots after extraction by ethyl acetate dried at105 °Cuntil mass stabilization, then were obtained water-soluble matters extraction by distilled water at90 °Cwithin 4 h at the hydromodule 1 : 10.The yields of the compounds extracted by ethyl acetate and water from roots and wood were close and were 1,9–2,1% (ethyl acetate) and 2,0–2,5% (water) of absolutely dry weight (in a.d.w.). The content of phenolic substances in ethyl acetate extract of roots was considerably more (more than in 2 times) than in an extract of wood.The ethyl acetate extract of spruce root preliminarily treated with hexane, was separated by silica gel column using chloroform-acetone mixture as the eluent (with the increase of the latter content in mixture from 0 to 100%). The contents monomeric (0–50% (CH3)2СO inCHCl3), oligomeric (50% (CH3)2СO inCHCl3) and polymeric lignans (100% (CH3)2СO and MeOH) in an extract have been evaluated.The comparative analysis of qualitative and quantitative chemical composition of roots and wood of Spruce was carried out. Researches have shown, that composition of phenolic extractives of roots and wood is very close. Differences are observed only on the relative content of compounds presented in extracts. The amount of dominant lignan – oxymatairesinol considerably above in wood of Spruce (in 1,7 times). The part of monomeric lignans in non-resinous ethyl acetate extracts of roots and wood was about 50% rel. and the part of the sum oligomeric and polymeric lignans was 35–40% rel.
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