03851nas a2200289   4500008004100000245008100041210006900122260026900191300001400460490000700474520271200481653001903193653001403212653001303226653004203239653003503281653001003316653002303326653001403349100001803363700001703381700001603398700001603414700002003430700001403450856009703464       1996                        eng d00aSupercritical fluid extraction of volatile compounds from lavandin and thyme0 aSupercritical fluid extraction of volatile compounds from lavand  aAffiliation: Department of Chemical Engineering, Technical University of Budapest, H-1521 Budapest, Hungary; Affiliation: Institute of Pharmacognosy, Semmelweis University of Medicine, H-1085 Budapest, Hungary; Affiliation: Department of General, Technicac1996///  a157 - 1650 v113 aSupercritical fluid extraction (SFE) of lavandin flowers and thyme herb using carbon dioxide was carried out under different extraction conditions. A stepwise increase of the extraction pressure resulted in the fractionation of the extracts into liquid and pasty products. Investigations on other ways of fractionation of the extracts were conducted, such as a single extraction and release of carbon dioxide at two stages by using two separators in series to effect the separation of the dissolved components. The SFE products were compared with essential oils obtained by conventional steam distillation. In the case of lavandin flowers, SFE products were found to be markedly different from the corresponding steam distilled oil. A remarkable amount of α-terpineol was present, and the ratio of linalol to linalyl acetate was extremely high in the steam-distilled essential oil in comparison with the supercritical fluid extract, which resulted from the hydrolysis of components during steam distillation. SFE of thyme gave a product which contained 10-15% thymol and 30-35% carvacrol, while steam distillation produced an oil containing 48-50% thymol and only 8-10% carvacrol. When the SFE products were collected as separate samples successively in time, marked changes were observed in the composition of the samples as the extraction progressed. Supercritical fluid extraction (SFE) of lavandin flowers and thyme herb using carbon dioxide was carried out under different extraction conditions. A stepwise increase of the extraction pressure resulted in the fractionation of the extracts into liquid and pasty products. Investigations on other ways of fractionation of the extracts were conducted, such as a single extraction and release of carbon dioxide at two stages by using two separators in series to effect the separation of the dissolved components. The SFE products were compared with essential oils obtained by conventional steam distillation. In the case of lavandin flowers, SFE products were found to be markedly different from the corresponding steam distilled oil. A remarkable amount of α-terpineol was present, and the ratio of linalol to linalyl acetate was extremely high in the steam-distilled essential oil in comparison with the supercritical fluid extract, which resulted from the hydrolysis of components during steam distillation. SFE of thyme gave a product which contained 10-15% thymol and 30-35% carvacrol, while steam distillation produced an oil containing 48-50% thymol and only 8-10% carvacrol. When the SFE products were collected as separate samples successively in time, marked changes were observed in the composition of the samples as the extraction progressed.10aCarbon dioxide10aLamiaceae10aLavandin10aLavandula intermedia Emeric ex Loisel10aSupercritical fluid extraction10aThyme10aThymus vulgaris L.10aVolatiles1 aOszagyán, M1 aSimándi, B1 aSawinsky, J1 aKéry, Á1 aLemberkovics, E1 aFekete, J  uhttp://www.scopus.com/scopus/inward/record.url?eid=2-s2.0-0029977760&partnerID=40&rel=R6.5.001785nas a2200181   4500008004100000245019200041210006900233260001200302300001400314490000700328520105700335100001501392700001601407700002001423700001201443700001401455856013401469       2004                        eng d00aCharacterization and TLC-bioautographic detection of essential oils from some Thymus Taxa. Determination of the activity of the oils and their components against plant pathogenic bacteria0 aCharacterization and TLCbioautographic detection of essential oi  c2004///  a300 - 3040 v173 aThe chemical composition of the oils of four thyme (Lamiaceae) chemotypes (Thymus vulgaris L., Thymus serpyllum L., Thymus x citriodorus (Pers.) Schreb., and Thymus x citriodorus "Archer's Gold") has been determined by gas chromatography (GC). Thymol was the main component of the oils of Thymus vulgaris and Thymus serpyllum, geraniol was the main component of the oil of Thymus x citriodorus, and carvacrol was the main component of the oil of Thymus x chriodorus "Archer's Gold". The bioactivity of the volatile oil of Thymus vulgaris and of the three main components of the oils against Gram negative plant pathogenic bacteria was examined by direct bioautography. They had an inhibitory effect on all of the test microorganisms. Two bacterial strains (Xanthomonas campestris pv. vesicatoria and Pseudomonas syringae pv. phaseolicola) were most sensitive in the bioautographic system and use of these bacteria would considerably shorten the process of bioautographic detection. The two antibiotics gentamycin and streptomycin were used as controls.1 aHorvath, G1 aSzabo, L, G1 aLemberkovics, E1 aBotz, L1 aKocsis, B  uhttps://thymus.myspecies.info/ref/characterization-and-tlc-bioautographic-detection-essential-oils-some-thymus-taxa-determination