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危険有害性情報のコード(GHS)

• 絵表示(GHS)

  

• 注意喚起語

  Danger

• 危険有害性情報

  H302：飲み込むと有害

  H315：皮膚刺激

  H319：強い眼刺激

  H331：吸入すると有毒

  H336：眠気やめまいのおそれ

  H351：発がんのおそれの疑い

  H372：長期にわたる、または反復暴露により臓器の障 害

• 注意書き

  P202：全ての安全注意を読み理解するまで取り扱わないこ と。

  P301+P312：飲み込んだ場合：気分が悪い時は医師に連絡する こと。

  P302+P352：皮膚に付着した場合：多量の水と石鹸で洗うこと。

  P305+P351+P338：眼に入った場合：水で数分間注意深く洗うこと。次にコ ンタクトレンズを着用していて容易に外せる場合は外す こと。その後も洗浄を続けること。

  P308+P313：暴露または暴露の懸念がある場合：医師の診断/手当てを 受けること。

(±)-メントール 価格

(±)-メントール 化学特性,用途語,生産方法

• 定義

  本品は、次の化学式で表されるテルペンアルコールである。

• 化粧品の成分用途

  変性剤、口腔衛生剤、皮膚コンディショニング剤、外用鎮痛剤、香料、香味剤

• 化学的特性

  Racemic menthol is a mixture of equal parts of the (1R,2S,5R)- and (1S,2R,5S)-isomers of menthol. It is a free-flowing or agglomerated crystalline powder, or colorless, prismatic, or acicular shiny crystals, or hexagonal or fused masses with a strong characteristic odor and taste. The crystalline form may change with time owing to sublimation within a closed vessel. The USP 32 specifies that menthol may be either naturally occurring l-menthol or syntheti-cally prepared racemic or dl-menthol. However, the JP XV and PhEur 6.0, along with other pharmacopeias, include two separate monographs for racemic and l-menthol.

• 物理的性質

  Physical Properties. The eight optically active menthols differ in their sensory properties. (?)-Menthol has a characteristic peppermint odor and also exerts a cooling effect. The other isomers do not possess this cooling effect and are, therefore, not considered to be “refreshing.” Racemic menthol occupies an intermediate position; the cooling effect of the (?)-menthol present is distinctly perceptible.
  The enantiomeric menthols have identical physical properties (apart from their specific rotations), but the racemates differ from the optically active forms in, for example, theirmelting points.Although the differences between the boiling points are small, the (racemic) stereoisomers can be separated by fractional distillation. Boiling points (in °C at 101.3 kPa) are as follows:
  rac-neomenthol, 211.7
  rac-neoisomenthol 214.6
  rac-menthol, 216.5
  rac-isomenthol, 218.6
  Other physical constants of commercially available levorotatory and racemic menthols are as follows: (?)-menthol, mp 43 °C, [α]20 D ?50° (ethanol, 10%); racemic menthol, mp 38 °C.
  Chemical Properties. Hydrogenation of menthols yields p-menthane; oxidation with chromic acid or catalytic dehydrogenation yields menthones. Dehydration under mild conditions yields 3-p-menthene as the main product. Reaction with carboxylic acids or their derivatives yields menthyl esters, which are used mainly as aroma substances and in pharmaceutical preparations and formulations. The esterification of menthols with benzoic acid is used on an industrial scale in the resolution of racemic menthol.

• 天然物の起源

  Has apparently not been reported to occur in nature

• 製造方法

  By hydrogenation of thymol followed by separation from its other isomers.

• 適応症

  Menthol, a cyclic alcohol (derived from peppermint, other mint oils, or prepared synthetically), relieves itching by generating a cool sensation. It is usually used in 0.25% to 2% concentrations but is present in concentrations as high as 16% in some OTC products.

• 調製方法

  Menthol occurs widely in nature as l-menthol and is the principal component of peppermint and cornmint oils obtained from the Mentha piperita and Mentha arvensis species. Commercially, lmenthol is mainly produced by extraction from these volatile oils. It may also be prepared by partial or total synthetic methods.
  Racemic menthol is prepared synthetically via a number of routes, e.g. by hydrogenation of thymol.

• 応用例（製薬）

  Menthol is widely used in pharmaceuticals, confectionery, and toiletry products as a flavoring agent or odor enhancer. In addition to its characteristic peppermint flavor, l-menthol, which occurs naturally, also exerts a cooling or refreshing sensation that is exploited in many topical preparations. Unlike mannitol, which exerts a similar effect due to a negative heat of solution, l-menthol interacts directly with the body’s coldness receptors. d-Menthol has no cooling effect, while racemic menthol exerts an effect approximately half that of l-menthol.
  When used to flavor tablets, menthol is generally dissolved in ethanol (95%) and sprayed onto tablet granules and not used as a solid excipient.
  Menthol has been investigated as a skin-penetration enhancer and is also used in perfumery, tobacco products, chewing gum and as a therapeutic agent. When applied to the skin, menthol dilates the blood vessels, causing a sensation of coldness followed by an analgesic effect. It relieves itching and is used in creams, lotions, and ointments. When administered orally in small doses menthol has a carminative action.

• 安全性プロファイル

  Moderately toxic by ingestion, intraperitoneal, and subcutaneous routes. An eye and skin irritant. K%en heated to decomposition it emits acrid smoke and irritating fumes. See also MENTHOL and 1-MENTHOL.

• 安全性

  Almost all toxicological data for menthol relate to its use as a therapeutic agent rather than as an excipient. Inhalation or ingestion of large quantities can result in serious adverse reactions such as ataxia and CNS depression,hypersensitivity reactions, severe abdominal pain, nausea, vomiting, vertigo, drowsiness, and coma.Although menthol is essentially nonirritant there have been some reports of hypersensitivity following topical application. In a Polish study approximately 1% of individuals were determined as being sensitive to menthol.There have been reports of apnea and instant collapse in infants after the local application of menthol to their nostrils.
  The WHO has set an acceptable daily intake of menthol at up to 0.4 mg/kg body-weight.
  LD₅₀ (rat, IM): 10.0 g/kg
  LD₅₀ (rat, oral): 3.18 g/kg

• 代謝

  Rabbits are said to eliminate 59% of dl-menthol as glucuronide (Williams, 1938).

• 貯蔵

  A formulation containing menthol 1% w/w in aqueous cream has been reported to be stable for up to 18 months when stored at room temperature.
  Menthol should be stored in a well-closed container at a temperature not exceeding 25°C, since it sublimes readily.

• 不和合性

  Incompatible with: butylchloral hydrate; camphor; chloral hydrate; chromium trioxide; b-naphthol; phenol; potassium permanganate; pyrogallol; resorcinol; and thymol.

• 規制状況(Regulatory Status)

  Included in the FDA Inactive Ingredients Database (dental preparations, inhalations, oral aerosols, capsules, solutions, suspensions, syrups, and tablets; also topical preparations). Included in nonparenteral medicines licensed in the UK. Accepted for use in foods and confectionery as a flavoring agent of natural origin. Included in the Canadian List of Acceptable Non-medicinal Ingredients.

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