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Title

ESSENTIAL OIL OF THYMUS PUBESCENS BOISS. ET KOTSCHY EX CELAK FROM DIFFERENT LOCALITY OF LAR VALLEY

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 Start Page 87 | End Page 127

Abstract

 The genus of Thymus Presents 14 species, which are found wild in different regions of Iran (1). One of the more distributed of these species is THYMUS PUBESCENS (2).The aerial parts of THYMUS PUBESCENS were collected from three various localities of Lar valley (in East of Tehran province). ESSENTIAL OILs isolated by steam distillation from the plant material at two stages, before flowering (BF) and full flowering (FF). Yields of ESSENTIAL OILs were 0.53% to 0.93% (at BF stage) and 1.23% to 2.03% (at FF stage). Therefore the oil content at BF stage was less than FF stage.At BF stage 26 compounds (representing 98% to 99.3% ofthe oils) and at FF stae 32 compounds (representing 97.7% to 98.5% of the oils) were characterized. Major constituents at BF stage were: CARVACROL (52.6% - 77.9%), THYMOL (2.7%-21.8%), g-terpinene (3.3%-7.4%), p-cymene (2.2%- 4.4%), and b-caryophyllene (1.7%-2.5%). Major constituents at FF stage were: CARVACROL (54.7% - 69.2%), p-cymene (6.7%-9.7%), borneol (1.7%- 5.1%), methyl CARVACROL (0.6%-6.6%) and 1,8-cineol +limonene (1.7%- 3.2%).Twenty-three constituents were common at two stages. 8-cadinene, thymyl acetate and g-muurolene (E)-b-ocimenewere found just at BF stage and a-phellandrene, a-terpineole, terpinen-4-ol, spathunelol, camphor, linalool,methyl linalo, methylthymol, thymoquinoneand thymodihydroquinone were found just at FF stage.

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