| Abstract
| - This study was conducted to determine the lipolytic effects of eight kinds of citrus peel oils and theircomponents. All of the citrus peel oils revealed lipolytic effects on olive oil model solution rangingfrom 10.9 to 73.8%. Hakyul (Citrus natsudaidai Hayata) showed the highest lipolytic effect (73.8%),followed by yuza (Citrus junos Sieb. ex Tanaka, 68.1%) and lemon (Citrus limonium, 63.4%), andtheir effects were comparable with or stronger than that of 5 mM raspberry ketone (p< 0.05). Among17 authentic compounds relating to citrus peel oils, octanal (78.6%) showed the highest lipolytic effect,followed by γ-terpinene (76.3%), limonene (75%), terpinen-4-ol (70.7%), nerol (69.9%), p-cymene(67.7%), and geranyl acetate (67.2%), and their effects were stronger than that of 5 mM raspberryketone (p< 0.05). Ethyl acetate, α-pinene, myrcene, citronellal, linallyl acetate, and citronellol exhibitedpoor lipolytic effect in the model solution. Lipolytic effect was found to be high when the oils includeda higher content of γ-terpinene and p-cymene. Limonene showed potential lipolytic effect, and itseffect is likely to be enhanced by the presence of γ-terpinene and p-cymene. It is considered thatmonoterpene hydrocarbons consisting of one or two double bonds would have stronger lipolytic effectthan those having three double bonds. Keywords: Lipolytic effect; citrus peel oils; hakyul (C. natsudaidai Hayata); octanal; γ-terpinene andp-cymene
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