Menthyl Acetate

同義語： L-Menthyl acetate; (1R,2S,5R)-2-Isopropyl-5-methylcyclohexyl acetate; Acetic acid menthyl ester; p-Menth-3-yl acetate; Menthyl ethanoate

Menthyl acetate is the acetic acid ester of L-menthol, carrying the classic p-menthane skeleton with an acetate group at C3. That ester linkage does more than just block the hydroxyl; it softens the sharp menthol blast and shifts the cooling curve, which is why formulators reach for it when they want a rounder, longer-lasting freshness. The molecule occurs naturally in Mentha piperita and Mentha arvensis, but commercial volumes are almost entirely synthetic, produced by acetylating menthol with acetic anhydride under acid catalysis.

From a handling standpoint, menthyl acetate is a mobile liquid at room temperature, which makes it far easier to incorporate into flavor and fragrance blends than solid menthol. It is lipophilic, ethanol-soluble, and essentially water-insoluble, so it performs best in oil-based systems, emulsions, and alcohol-based applications. The material is typically supplied at ≥98% purity by GC, with the L-isomer as the dominant component because the sensory profile is tied directly to that stereochemistry.

Buyers in the flavor and fragrance industry use menthyl acetate as a top-note modifier in mint compositions, oral care products, confectionery, and chewing gum. In pharma, it shows up in topical analgesics and cough drops where a milder cooling sensation is preferred. The ester also serves as a synthetic intermediate for other menthyl derivatives and as a reference standard in analytical work. Because the acetate group is relatively stable but can hydrolyze under strong acid or base, storage and processing conditions matter for keeping the profile consistent.

化学構造と性質

Menthyl acetate belongs to the monoterpene ester family. Its cyclohexane ring is substituted with an isopropyl group at C2 and a methyl group at C5, while the acetate sits at C3. The ester carbonyl introduces a mild polarity that improves compatibility with many fragrance bases without sacrificing volatility. With a molecular weight of 198.30 g/mol, it boils around 229–230°C at atmospheric pressure and has a refractive index typically between 1.446 and 1.450. The specific rotation for the L-isomer falls in the −72° to −78° range, a useful identity check for incoming lots.

作用機序

• TRPM8 activation: Although weaker than menthol, menthyl acetate can activate the cold-sensing TRPM8 channel, producing a gentle cooling effect that builds more slowly and lingers longer.
• Ester hydrolysis: Under acidic or basic conditions, the ester can hydrolyze to release menthol and acetic acid, a pathway relevant to both stability studies and controlled-release designs.
• Olfactory modulation: The acetate group alters the vapor pressure and release profile, softening the harsh mint top note and extending the perceived freshness in fragrance blends.
• Lipophilic partitioning: The ester favors oil phases, which influences how it distributes in emulsions and affects sensory perception on skin and mucosa.

品質仕様

供給および書類

• 容量: 20 MT per month, with campaign production for larger volumes.
• リードタイム: 3～5営業日（在庫品）
• ドキュメント: COA, MSDS, TDS, and, when required, residual solvent and heavy metal statements.
• パッケージ: 25 kg HDPE drums, 200 kg steel drums, or ISO tanks for bulk shipments. Store in a cool, dry area away from direct sunlight.

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