
One of our best known chemical families, monoterpenes are unsaturated hydrocarbons with 10 carbon atoms and at least one double bond. The amount of hydrogen atoms in a monoterpene varies depending on the number of double bonds the structure contains.
Monoterpenes are known to be some of the most volatile compounds. Due to their small molecular size, they have excellent volatility and often contribute to the top note of the essential oil’s aroma as well as to your essential oil blend.
Many monoterpenes oxidise readily and may be irritating or sensitising to the skin and mucous membranes.
Typically, many essential oils that are high in monoterpenes are chosen for their tonifying, decongestant, analgesic and rubefacient properties. For example, their decongestant activity has been known to be used for respiratory congestion and oedema.
Common monoterpene compounds include: limonene, alpha-pinene and camphene.
Examples of Monoterpene rich essential oils include:
Sweet orange –94% limonene
Scotch pine – 45% a-pinene & 32% b-pinene
Rosemary ct verbenone – 10% camphene
Black Spruce – 17.9% camphene