01543nas a2200253   4500008004100000245012000041210006900161260022300230300001400453490000600467520051900473653001400992653002801006653003001034653001401064653001101078653002101089653001501110100001801125700001701143700001601160700001601176856009701192       1996                        eng d00aA comparison between the oil and supercritical carbon dioxide extract of Hungarian wild thyme (Thymus serpyllum L.)0 acomparison between the oil and supercritical carbon dioxide extr  aAffiliation: Department of Chemical Engineering, Technical University of Budapest, H-1521 Budapest, Hungary; Affiliation: Institute of Pharmacognosy, Semmelweis University of Medicine, H-1085 Budapest, Hungaryc1996///  a333 - 3350 v83 aTwo samples of wild thyme (Thymus serpyllum L.), which were collected from different locations in Hungary, were subjected to CO2 extraction and oil isolation by hydrodistillation. Using GC and GC/MS as the method of analysis their compositions were compared. Analysis revealed that the oils and extracts contained the same components although they differed quantitatively. The concentration of p-cymene, borneol, nerol and carvacrol was higher in the distilled oil than in the volatile concentrate obtained by SFE.10aCarvacrol10aCO2 extract composition10aEssential oil composition10aLamiaceae10aThymol10aThymus serpyllum10aWild thyme1 aOszagyán, M1 aSimándi, B1 aSawinsky, J1 aKéry, Á  uhttp://www.scopus.com/scopus/inward/record.url?eid=2-s2.0-0030148197&partnerID=40&rel=R6.5.003851nas 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=R6.5.0