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buxus_sempervirens_l [2018/05/13 12:51]
andreas
buxus_sempervirens_l [2019/03/28 14:15] (aktuell)
andreas
Zeile 5: Zeile 5:
 "The boxwood is poisonous in all parts; it contains about 70 alkaloids, including Cyclobuxin D. Leaves and bark have a total alkaloid content of 3%... Boxwood has already been used in antiquity for coughs, stomach and intestinal diseases and against recurrent fever like malaria."​ \\ "The boxwood is poisonous in all parts; it contains about 70 alkaloids, including Cyclobuxin D. Leaves and bark have a total alkaloid content of 3%... Boxwood has already been used in antiquity for coughs, stomach and intestinal diseases and against recurrent fever like malaria."​ \\
 [[http://​de.wikipedia.org/​wiki/​Buxus_sempervirens]] [[http://​de.wikipedia.org/​wiki/​Buxus_sempervirens]]
 +
 +"A very odorous compound, 4‐mercapto‐4‐methylpentan‐2‐one [4-methyl-4-mercaptopentan-2-one;​ 4-methyl-4-sulfanylpentan-2-one] has been identified in the box tree, Buxus sempervirens L., and in broom, Sarothamnus scoparius (L.) Koch by a selective extraction of volatile thiol compounds. Although the concentration varied depending on weather and the places where samples were collected, the maximum concentration of the thiol from these plants reached ca. 22 ng/g fresh leaves (box tree) and 16 ng/g fresh stem (broom), respectively. Considering the very low perception threshold of this thiol, the characteristic aroma of these plants is due to 4‐mercapto‐4‐methylpentan‐2‐one."​ \\
 +[Tominaga, Takatoshi, and Denis Dubourdieu. "​Identification of 4‐mercapto‐4‐methylpentan‐2‐one from the box tree (Buxus sempervirens L.) and broom (Sarothamnus scoparius (L.) Koch)."​ Flavour and fragrance journal 12.6 (1997): 373-376]
 +
 +{{:​pentan2on_4me4thiol.jpg| 4-methyl-4-mercaptopentan-2-one }} [[http://​www.thegoodscentscompany.com/​data/​rw1038251.html |4-methyl-4-mercaptopentan-2-one]] (//odor: blackcurrant,​ catty, fruity, sulphurus//​)
  
 "In aqueous media of low ionic strength (Na+ = 6 × 10−3M) the alkaloid [[http://​toxcenter.org/​stoff-infos/​c/​cyclobuxin.pdf|cyclobuxine]],​ a steroidal diamine, exerts a profound effect on the stability of helical polynucleotides (DNA, S-RNA and dAT:dAT). This effect is biphasic in the sense that at low concentrations of the agent (≤ 10−4M) there is stabilization of the native, while at higher concentrations (≥5 × 10−4M) there is stabilization of the denatured conformation. In a medium containing 51% methanol only the labilizing interaction persists while at high ionic strength both types of interaction are eliminated. These effects of cyclobuxine are restricted to the reversible order—disorder transition and do not extend to strand separation or re-combination."​ \\ "In aqueous media of low ionic strength (Na+ = 6 × 10−3M) the alkaloid [[http://​toxcenter.org/​stoff-infos/​c/​cyclobuxin.pdf|cyclobuxine]],​ a steroidal diamine, exerts a profound effect on the stability of helical polynucleotides (DNA, S-RNA and dAT:dAT). This effect is biphasic in the sense that at low concentrations of the agent (≤ 10−4M) there is stabilization of the native, while at higher concentrations (≥5 × 10−4M) there is stabilization of the denatured conformation. In a medium containing 51% methanol only the labilizing interaction persists while at high ionic strength both types of interaction are eliminated. These effects of cyclobuxine are restricted to the reversible order—disorder transition and do not extend to strand separation or re-combination."​ \\
buxus_sempervirens_l.1526208668.txt.gz · Zuletzt geändert: 2018/05/13 12:51 von andreas