出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2012/10/26 07:39:04」(JST)
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| Strychnos nux-vomica | |
|---|---|
| Illustration from Köhler's Medizinal-Pflanzen | |
| Habitus | |
| Scientific classification | |
| Kingdom: | Plantae |
| (unranked): | Angiosperms |
| (unranked): | Eudicots |
| (unranked): | Asterids |
| Order: | Gentianales |
| Family: | Loganiaceae |
| Genus: | Strychnos |
| Species: | S. nux-vomica |
| Binomial name | |
| Strychnos nux-vomica L. |
|
The strychnine tree (Strychnos nux-vomica L.) also known as nux vomica, poison nut, semen strychnos, Liz Vomica and quaker buttons, is a deciduous tree native to India, southeast Asia. It is a medium-sized tree in the family Loganiaceae that grows in open habitats. Its leaves are ovate and 2–3.5 inches (5.1–8.9 cm) in size.[1]
It is a major source of the highly poisonous alkaloids strychnine and brucine, derived from the seeds inside the tree's round, green to orange fruit. The seeds contain approximately 1.5% strychnine, and the dried blossoms contain 1.0%.[1] However, the tree's bark also contains brucine and other poisonous compounds.
Contents
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S. nux-vomica is a medium-sized tree with a short thick trunk. The wood is dense, hard white, and close-grained. The branches are irregular and are covered with a smooth ashen bark. The young shoots are a deep green colour with a shiny coat. The leaves have an opposite arrangement, short stalked, are oval shaped, also have a shiny coat and are smooth on both sides. The leaves are about 4 inches (10 cm) long and 3 inches (7.6 cm) wide. The flowers are small with a pale green colour with a funnel shape. They bloom in the cold season and have a foul smell. The fruit are about the size of a large apple with a smooth and hard shell which when ripened is a lovely orange colour. The meat of the fruit is soft and white with a jelly-like pulp containing five seeds covered with a soft woolly substance.
The seeds are removed from the fruit when ripe. They are then cleaned, dried and sorted. The seeds have the shape of a flattened disk completely covered with hairs radiating from the center of the sides. This gives the seeds a very characteristic sheen. The seeds are very hard, with a dark grey horny endosperm where the small embryo is housed that give off no odour but possess a very bitter taste. The plant is native to southeast Asia and Australia normally in tropical and subtropical areas.
There are no uses in modern medicine, although it was widely used in medicine before World War II. Strychnine is a deadly poison with a lethal dose to humans of about 30 to 120 mg. Survival of substantially higher doses has been reported. The properties of Nux Vomica are those of the alkaloid strychnine. Strychnine is eliminated with a half-life of about 12 hours.[2]
The most direct symptom caused by strychnine is violent convulsions due to a simultaneous stimulation of the motor or sensory ganglia of the spinal cord. During the convulsions there is a rise in blood pressure. Brucine closely resembles strychnine in its action, but is slightly less poisonous as it only causes paralysis of the peripheral motor nerves.
Strychnos nux-vomica has shown to suppress allergen-specific Immunoglobulin E (IgE) antibody response in mice, suggesting its possible application in allergic conditions.[3]
In vitro Strychnos nux-vomica inhibited the growth of AGS human gastric carcinoma cells.[4]
In the Indian Unani system of medicine, "hudar" is a mixture containing Strychnos nux-vomica and used to elevate blood pressure.The seeds are first immersed in water for 5 days, in milk for 2 days followed by their boiling in milk.[5] In India, the quality/toxicity of traditional medical crude and processed Strychnos seeds can be controlled by examining the toxic alkaloids using established HPLC methods and/or HPLC-UV methods.[6]
Strychnos nux-vomica is also used in homeopathy.[7][unreliable source?]
Strychnos has not been proven effective for the treatment of any illness. Since the seeds contain strychnine poison, conventional doctors do not recommend it as a medicine. It is on the Commission E list of unapproved herbs because it is not recommended for use and has not been proven to be safe or effective. There is also no clinical trial evidence of Strychnos supporting it being a viable cancer treatment.
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| リンク元 | 「Loganiaceae」「ホミカ」 |
| 拡張検索 | 「Strychnos nux-vomica」 |
| 関連記事 | 「n」 |