Peppermint oil (peppermint oil) - mint oil

Japanese: ハッカ油(薄荷油) - はっかゆ（英語表記）mint oil

The leaves and stems of the Mentha genus, a perennial plant of the Lamiaceae family, are dried, and the essential oil contained therein (yield about 1%) is separated by steam distillation (extracted oil), and cooled to below 4°C. This is a pale yellow liquid that is refined by removing the white crystals (menthol brain) mainly consisting of free menthol. It is also called de-menthagen oil. There are many types of mint used as a raw material, and the main components vary greatly depending on the raw material, so it is often called by different names. The oriental species ( M. arvensis ), including Japanese mint, has a high menthol content in its essential oil, and the main components are l -menthol (70-90%), menthone (21%), pinene, camphene, menthenone, limonene, sesquiterpenes, etc., and this is what is meant when the term "menthka oil" is used in the narrow sense.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

シソ科の多年草であるハッカ属の葉茎を乾燥し，これに含有される精油(収率約1％)を水蒸気蒸留で分離し(取卸油)，4℃以下に冷却したときに生ずる，遊離メントールを主体とした白色結晶(ハッカ脳)を除いて精製した淡黄色の液体。脱脳油ともいう。原料とするハッカはその種類が多く，原料種によって主成分にも大きな違いがあるため，異なる名称で呼ばれることが多い。　ニホンハッカを含む東洋種(M.arvensis)は精油にメントール含量が多く，主成分は，l‐メントール(70～90％)，メントン(21％)，ピネン，カンフェン，メンテノン，リモネン，セスキテルペンなどで，狭義にハッカ油というときはこれを指す。

出典　株式会社平凡社世界大百科事典第２版について　情報

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