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pimpinella_saxifraga_l [2014/11/26 14:04]
andreas |
pimpinella_saxifraga_l [2015/06/13 11:39] (aktuell)
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| Perennial herb, 0.30-0.60m high, native to Europe, West Asia, naturalized in North America; stem round in cross-section; leaves pinnate; flowers pink. | Perennial herb, 0.30-0.60m high, native to Europe, West Asia, naturalized in North America; stem round in cross-section; leaves pinnate; flowers pink. |
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| | Roots of this plant have been used in herbal medicine for their expectorant, broncho-secretolytic and antiphlogistic properties like [[pimpinella_major_l._huds|P.major]]. |
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| "//**Pimpinella saxifraga subsp. eusaxifraga**//: Because of the wide range of morphological variability and the unsatisfactory systematic division it seemed necessary to investigate the essential root oils from plants with simple segmented leaves and dissected leaves separately. Main constituent (about 60%) of the root oils from both forms is trans-epoxy-pseudoisoeugenyl-2-methylbutyrate. Furthermore, it is characteristic for these two oils that 1,4-dimethyl-azulene and its postulated precursors are only present in relatively low concentrations (totally about 5%). In a very few cases we could not at all establish the occurrence of 1,4-dimethylazulene in the volatile oils of roots from Pimpinella saxifraga subsp.eusaxifraga. Interestingly, the root oils of plants with simple segmented and dissected leaves also exhibit significant differences, mainly in the sesquiterpenes. | "//**Pimpinella saxifraga subsp. eusaxifraga**//: Because of the wide range of morphological variability and the unsatisfactory systematic division it seemed necessary to investigate the essential root oils from plants with simple segmented leaves and dissected leaves separately. Main constituent (about 60%) of the root oils from both forms is trans-epoxy-pseudoisoeugenyl-2-methylbutyrate. Furthermore, it is characteristic for these two oils that 1,4-dimethyl-azulene and its postulated precursors are only present in relatively low concentrations (totally about 5%). In a very few cases we could not at all establish the occurrence of 1,4-dimethylazulene in the volatile oils of roots from Pimpinella saxifraga subsp.eusaxifraga. Interestingly, the root oils of plants with simple segmented and dissected leaves also exhibit significant differences, mainly in the sesquiterpenes. |
| in the other root oils, seems remarkable. As already observed in case of the root oils of the other Pimpinella subspecies (Table I) monoterpene hydrocarbons can only be detected in traces. \\ | in the other root oils, seems remarkable. As already observed in case of the root oils of the other Pimpinella subspecies (Table I) monoterpene hydrocarbons can only be detected in traces. \\ |
| //**Pimpinella saxifraga subsp. nigra**//: This subspecies can be delimited from the others chiefly by cutting the fresh root from which a blue oil emerges, indicating the formation of an azulene derivative (1,4-dimethylazulene)... It is noteworthy that in contrast to the previously mentioned oils, the root oils of | //**Pimpinella saxifraga subsp. nigra**//: This subspecies can be delimited from the others chiefly by cutting the fresh root from which a blue oil emerges, indicating the formation of an azulene derivative (1,4-dimethylazulene)... It is noteworthy that in contrast to the previously mentioned oils, the root oils of |
| Pimpinella saxifraga subsp.nigra are dominated by different C12-compounds, which represent approximately 60% and 80%, respectively, of these oils. Pregeijerene, 1,5-dimethyltricyclo-(4.4.0.02‘6)deca-4,7-diene and an unknown constituent are supposed to be intermediates, arising by stepwise dehydrogenation and cyclization during the formation of 1,4-dimethyl-azulene. The latter component, which was described in Pimpinella saxifraga | Pimpinella saxifraga subsp.nigra are dominated by different C12-compounds, which represent approximately 60% and 80%, respectively, of these oils. Pregeijerene, 1,5-dimethyltricyclo-(4.4.0.02‘6)deca-4,7-diene and an unknown constituent are supposed to be intermediates, arising by stepwise dehydrogenation and cyclization during the formation of 1,4-dimethylazulene. The latter component, which was described in Pimpinella saxifraga |
| subsp.nigra for the first time by Meuche and Huneck, is responsible for the characteristic blue colour of | subsp.nigra for the first time by Meuche and Huneck, is responsible for the characteristic blue colour of |
| the root oil of this plant. It is remarkable that this norsesquiterpene is not a distillation artefact in the | the root oil of this plant. It is remarkable that this norsesquiterpene is not a distillation artefact in the |
