View source for Doc:9,11,13-Octadecatrienoic acid

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There are 8 possible isomers, and 4 are naturally identified.
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３つある二重結合の構造異性体は８種類考えられるが、４種が天然に見つかっている。
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;&alpha;-eleostearic acid (cis, trans, trans) m.p. 48 °C
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The most common acid of this group. Principal acid of tung oil or China Wood oil, and the seed oil of [http://metabolomics.jp/wiki/Species:Momordica ''Momordica charantia''] and [http://metabolomics.jp/wiki/Species:Centranthus ''Centranthus macrosiphon'']. It is easily converted to &beta;-eleostearic acid by light, heat, sulfur, acid, or iodine.
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もっとも一般的で、ツング（中国では四川省に生える油桐）油、
[http://metabolomics.jp/wiki/Species:Momordica ''Momordica charantia''] や [http://metabolomics.jp/wiki/Species:Centranthus ''Centranthus macrosiphon''] の種から取れる油の主成分。光や熱、硫黄、酸、ヨウ素などによって容易に &beta;-eleostearic acid に変化する。 
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; Punicic acid (cis, trans, cis) m.p. 41 °C
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Principal acid of [http://metabolomics.jp/wiki/Species:Punica pomegranate] seed oil. Yellow. It is easily coverted to &beta;-eleostearic acid by the same catalysts. Its alternative name is Trichosanic acid, a major component of [http://metabolomics.jp/wiki/Species:Trichosanthes ''Trichosanthes kirilowii japonica''] seed oil. It shows platelet aggregation <ref>Takenaga M, Hirai A, Terano T, Tamura Y, Kitagawa H, Yoshida S (1988) "In vitro effect of trichosanic acid, a major component of Trichosanthes japonica on platelet aggregation and arachidonic acid metabolism in human platelets" ''Prostaglandins Leukot Essent Fatty Acids'' 31(2):65-72</ref>

:In a recent article<ref>Fatope MO, Al Burtomani SK, Takeda Y (2002) "Monoacylglycerol from Punica granatum Seed Oil" ''J Agric Food Chem'' 50:357-360</ref>, (trans, cis, trans)-form was isolated from pomegranate ([http://metabolomics.jp/wiki/Species:Punica ''Punica granatum''] seed and it constituted about 88% of the seed oil.
The result contradicts other results (Punicic acid is major, e.g. <ref>Kyralan M, Golukcu M, Tokgoz H (2009) "Oil and Conjugated Linolenic Acid Contents of Seeds from Important Pomegranate Cultivars (Punica granatum L.) Grown in Turkey" ''J Am Oil Chem Soc'' 86:985–990</ref>), and is considered an error. {{WrittenBy|Masanori Arita}}
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[http://metabolomics.jp/wiki/Species:Punica ザクロ] の種から取れる黄色い油の主成分。ザクロの属名 Punica より名がついている。 &alpha;-eleostearic acidと同様に、同じ触媒によって簡単に &beta;-eleostearic acid に変化する。別名は  Trichosanic acid で、日本のでヘビウリと呼ばれる [http://metabolomics.jp/wiki/Species:Trichosanthes ''Trichosanthes kirilowii japonica''] 種子の主成分。血小板の凝固作用がある。

:最近の文献では (trans, cis, trans)-型がザクロ[http://metabolomics.jp/wiki/Species:Punica ''Punica granatum''])種子油の主成分で88%を占めると報告されている。この結果はこれまでの研究(Punicic acid が主成分と異なるため、間違いではないかと思われる。 {{WrittenBy|有田正規}}
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; &beta;-eleostearic acid (trans, trans, trans) m.p. 72 °C
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Transformed form of &alpha;-eleostearic acid or punicic acid.
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&alpha;-eleostearic acid や punicic acid が変化したもの。
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; Catalpic acid (trans, trans, cis) m.p. 32 °C
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Principal acid of [http://metabolomics.jp/wiki/Species:Catalpa ''Catalpa ovata, Catalpa speciosa'' and ''Catalpa bignonioides''] seed oil.
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[http://metabolomics.jp/wiki/Species:Catalpa ''Catalpa ovata, Catalpa speciosa'' や ''Catalpa bignonioides''] 種子油の主成分。
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;References
<references/>