trans-Piperityl acetate (CAS 78774-34-2) is a terpene ester with a fresh minty–herbal odour, used primarily as a flavour and fragrance ingredient and odour modulator in perfumes (green, minty, herbal accords for fine fragrance, body sprays, soaps, shampoos), personal care and home-care products (toothpastes, mouthwashes, cleaners, fabric softeners, air care, candles), and at low dose in food and beverage flavours to reinforce coolness and cleanliness in confectionery, chewing gum, syrups and soft drinks; in formulations it acts as a top-to-heart note that boosts freshness, rounds natural mint profiles, masks base off-notes and prolongs a clean-mouth sensation when blended with menthol, menthone, linalool or eucalyptol; beyond direct odour use it serves as an intermediate for related aroma chemicals and as a reference standard for analytical, sensory and mint-accord R&D; it dissolves well in ethanol, oils and common perfumery solvents, has moderate volatility, and should be stored tightly closed in a cool, light-protected place away from strong oxidants; typical use levels depend on the matrix (trace to about 0.1–0.5% in fragrance concentrates and lower in flavours), with adherence to IFRA guidance and local regulations recommended.
