Volatile Profile of the Peel Oil of ‘Setoka’ ([‘Kiyomi x Encore No.2’] x ‘Murcott’), A New Hybrid Sweet Citrus Fruit

Abstract

The volatile profile of ‘Setoka,’ a cold-pressed peel oil of a citrus hybrid was investigated by GC and GC/MS. Among the 74 components quantified in Setoka oil, 24 terpene hydrocarbons and 50 oxygenated compounds were identified, with peak weight percentages of 82.6 % and 16.8%, respectively. The major components of Setoka oil were limonene (77.3%), (Z)-nerolidol (4.2%), myrcene (1.9%), (E)-2-dodecenal (1.8%) and cis-carveol (1.0%). Although limonene was the most prominent component in Setoka oil, its content was relatively low compared to the commonly encountered citrus peel oils. A peculiarity of the volatile profile of Setoka oil was the ratio of alcohols (8.8%) to aldehydes (4.9%), which resulted from the relative abundance of (Z)-nerolidol and cis-carveol. The level of esters (1.7%) was another characteristic of Setoka oil. A significant feature of Setoka oil was suggested to the relative affluence in (Z)-nerolidol, (E)-2-dodecenal, carvone and α-terpinyl acetate.