Alphaionone

Alpha-ionone is an organic compound in the ionone family, a cyclic enone known for its violet-like aroma. Its molecular formula is C13H20O, and in perfumery it is valued for a balanced floral-woody note.

Alpha-ionone occurs as a degradation product of carotenoids and can be found in a variety of essential oils and fruits, including violets, raspberries, and blackcurrants. The scent is described as violet, fruity, and powdery, contributing to many floral and fruit fragrances.

In industry, alpha-ionone is produced predominantly by chemical synthesis from precursors such as pseudoionone or beta-ionone, via cyclization and oxidation steps. It can also be isolated from natural essential oils in smaller quantities.

In perfumery, alpha-ionone provides a violet note used in combinations to emulate floral scents and as a fixative or aroma ingredient; in flavor applications it can contribute to berry or violet flavors at very low concentrations.

Alpha-ionone is treated as a standard fragrance ingredient. It is not considered highly toxic but may cause skin sensitization in some individuals; standard handling precautions apply. It is regulated by fragrance industry guidelines and approved for use at specified concentrations.