Limonene

Limonene is a terpene with an extremely strong smell of oranges. Limonene takes its name from the lemon, as the rind of the lemon, like other citrus fruits, contains considerable amounts of this chemical compound, which is responsible for much of their smell.

Limonene in Huajiao fruit
The two most commercially popular species of huajiao fruit are bungeanum (red huajiao) and schinifolium (green huajiao). Fresh huajiao has a very high content of essential oil, up to 11%, which is described as having fresh, spicy, floral, cooling, and green aroma notes. A comprehensive analysis of the essential oils showed a total of 120 aromatic compounds for each species. Linalyl acetate (15%), linalool (13%), and limonene (12%) are the major components of red huajiao, whereas linalool (29%), limonene (14%), and sabinene (13%) are the major components of green huajiao.

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