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hamamelis_virginiana_l [2015/02/22 10:38]
andreas |
hamamelis_virginiana_l [2015/02/22 16:31]
andreas |
| "... volatile fractions were obtained by water distillation from the entire fresh leaves and freshly collected bark in 0.13 % and 0.09% yields, respectively, on dry weight basis... Whereas the product of bark distillation was found to typically contain mainly sesquiterpenoids (15.35%) with α-ylangene, α-amorphene, γ-bisabolene, trans-nerolidol, α-eudesmol as the most abundant representatives, that obtained from the leaves included distinct monoterpenoids (linalool, α-terpineol, geraniol) with fairly high contents... With reference to the alleged biologically active fraction containing carbonyl components, the volatiles of the bark were found to contain a relatively higher level of aliphatic aldehydes and ketones (7.7%) compared with that of the leaves (4.6%). The presence of hex-2-enal and 6-methyl-hepta-3,5-dien-2-one, commonly listed as typical Hamamelis | "... volatile fractions were obtained by water distillation from the entire fresh leaves and freshly collected bark in 0.13 % and 0.09% yields, respectively, on dry weight basis... Whereas the product of bark distillation was found to typically contain mainly sesquiterpenoids (15.35%) with α-ylangene, α-amorphene, γ-bisabolene, trans-nerolidol, α-eudesmol as the most abundant representatives, that obtained from the leaves included distinct monoterpenoids (linalool, α-terpineol, geraniol) with fairly high contents... With reference to the alleged biologically active fraction containing carbonyl components, the volatiles of the bark were found to contain a relatively higher level of aliphatic aldehydes and ketones (7.7%) compared with that of the leaves (4.6%). The presence of hex-2-enal and 6-methyl-hepta-3,5-dien-2-one, commonly listed as typical Hamamelis |
| ketones, cannot be confirmed by this study... For the bark and leaf distillation product, we found 6,10,14-trimethylpentadecan-2-one to be present in relatively high amounts (ca 0.7 %), thus being a better common representative of Hamamelis ketones than the above-mentioned constituents. Within the group of aliphatic | ketones, cannot be confirmed by this study... For the bark and leaf distillation product, we found 6,10,14-trimethylpentadecan-2-one to be present in relatively high amounts (ca 0.7 %), thus being a better common representative of Hamamelis ketones than the above-mentioned constituents. Within the group of aliphatic |
| aldehydes, nonanal (2.72 %) and hexacosanal (0.91 %) were the main Hamamelis ketones in the bark and leaf distillate, respectively... Compounds with 13 carbons such as the vitispiranes, [[http://www.leffingwell.com/chirality/riesling_acetal.htm|riesling acetal]], 1,1,6-trimethyl-1,2-dihydronaphthalene, 1,1,6-trimethyl-1,2,3,4-tetrahydronaphthalene, trans-β-damascenone, | aldehydes, nonanal (2.72 %) and hexacosanal (0.91 %) were the main Hamamelis ketones in the bark and leaf distillate, respectively... Compounds with 13 carbons such as the vitispiranes, [[http://www.leffingwell.com/chirality/riesling_acetal.htm|riesling acetal]], [[http://www.thegoodscentscompany.com/data/rw1513131.html|1,1,6-trimethyl-1,2-dihydronaphthalene]], 1,1,6-trimethyl-1,2,3,4-tetrahydronaphthalene, trans-β-damascenone, |
| and hydroxydihydroedulan are rare essential oil components, accounting for ca 0.4%. The diterpenes manoyloxide, geranyl-linalool isomer-4, kaurene and manool were altogether identified in the leaf and bark product at 0.62% and 0.99%, respectively; geranyllinalool isomer-4 and manoyl oxide being the main components in both distillates." \\ | and hydroxydihydroedulan are rare essential oil components, accounting for ca 0.4%. The diterpenes manoyloxide, geranyl-linalool isomer-4, kaurene and manool were altogether identified in the leaf and bark product at 0.62% and 0.99%, respectively; geranyllinalool isomer-4 and manoyl oxide being the main components in both distillates." \\ |
| [Study on the composition of the volatile fraction of Hamamelis virginiana., Engel, R., Gutmann, M., Hartisch, C., Kolodziej, H., Nahrstedt, A., Planta medica, Vol.64(3), 1998, 251-258] \\ | [Study on the composition of the volatile fraction of Hamamelis virginiana., Engel, R., Gutmann, M., Hartisch, C., Kolodziej, H., Nahrstedt, A., Planta medica, Vol.64(3), 1998, 251-258] \\ |
