Salicylic acid - Salicylic acid (English spelling)

Japanese: サリチル酸 - さりちるさん(英語表記)salicylic acid
Salicylic acid - Salicylic acid (English spelling)

Its chemical formula is C 6 H 4 (OH)COOH and it is another name for o (ortho)-hydroxybenzoic acid.


It is produced by reacting sodium phenoxide with carbon dioxide under heat and pressure. This reaction is called the Kolbe-Schmitt reaction. Its molecular weight is 138.1, its melting point is 159°C. It is a colorless solid that sublimes. It is a type of carboxylic acid that is acidic (dissociation constant K 1 = 1.55×10 -3 ), and because it has a phenolic hydroxyl group, it turns purple in iron(III) chloride solution. It is used as a synthetic raw material for pharmaceuticals, fragrances, and dyes.

[Masahiro Hirota]

Medicinal

It is used as a disinfectant and keratin softener. It has antipyretic, analgesic and anti-inflammatory properties, but sodium salicylate is used for oral administration or injection, and salicylic acid itself is not used orally because it causes severe digestive disorders, so it is only used externally. Salicylic acid bandages used to remove corns and warts contain 50% salicylic acid, and ointments and topical solutions containing 2-10% salicylic acid are used for dermatophytosis such as tinea (athlete's foot) and psoriasis. It is also used in treatments for alopecia, underarm odor, and miliaria (heat rash).

[Fumiji Koho]

[References] | Psoriasis | Tinea | Hydroxybenzoic acid

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

Japanese:

化学式はC6H4(OH)COOHで、o(オルト)-ヒドロキシ安息香酸の別名。


 加熱・加圧下でナトリウムフェノキシドと二酸化炭素を反応させて製造する。この反応をコルベ‐シュミットKolbe-Schmitt反応という。分子量138.1、融点159℃。無色の固体で昇華性をもつ。カルボン酸の一種で酸性(解離定数K1=1.55×10-3)を示し、フェノールのヒドロキシ基をもつので塩化鉄(Ⅲ)溶液により紫色を呈する。医薬品のほか香料や染料の合成原料として用いる。

[廣田 穰]

薬用

殺菌剤、角質軟化剤として用いる。解熱鎮痛消炎作用をもつが、内服や注射にはサリチル酸ナトリウムが用いられ、サリチル酸そのものは消化器障害が著しいため内服には用いられず、外用のみである。うおのめ、いぼとりに用いられるサリチル酸絆創膏(ばんそうこう)には50%含有され、白癬(はくせん)(水虫)や乾癬など皮膚糸状菌症には2~10%の軟膏や塗布液が用いられる。また脱毛症や腋臭(えきしゅう)症(わきが)、汗疹(かんしん)(あせも)などの治療剤にも配合されている。

[幸保文治]

[参照項目] | 乾癬 | 白癬 | ヒドロキシ安息香酸

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