Citrus essential oils have emerged as a key solution to replace synthetic food preservatives, owing to their rich limonene content, a monoterpene
that exhibits strong antibacterial and antifungal properties.
According to the literature, the inhibitory effects of essential oils are consistent with the action of monoterpene
and sesquiterpene constituents on the cell membrane, and the damage to membrane produces different effects on microorganisms (Oliveira et al., 2016).
Bakuchiol [(1E,3S)-3-ethenyl-3,7-dimethyl-1,6-octadien-l-yl]phenol, a prenylated phenolic monoterpene
found in the seeds and leaves of various plants, particularly Psoralea corylifolia, has been used to treat a broad array of disorders, including skin conditions, in the traditional medical practices of China, Japan, and Korea, as well as Ayurvedic medicine in India.
A total of 58 secondary metabolites, mainly comprising 18 esters, six monoterpene
hydrocarbons, two oxygenated monoterpenes
, 20 sesquiterpene hydrocarbons, seven oxygenated sesquiterpenes, and four ketones, were positively or tentatively identified.
Linalool and 4-terpineol are terpenoid alcohols of the monoterpene
Cyclization of an acyclic monoterpene
to the iridane skeleton may involve a double Michael-type addition of geranyl pyrophosphate to yield iridodial [27-28].
A key citrus fruit compound, monoterpene
, is associated with a reduced risk of cancer formation and progression.
The measured deposition rates include compounds whose deposition had not previously been quantified (e.g., hydroxymethyl hydroperoxide, peroxyacetic acid, monoterpene
nitrooxy hydroperoxide, and hydrogen cyanide).
Essential oils of seven Eucalyptus species were found rich in monoterpene
hydrocarbons and oxygenated monoterpenes
It was also found that the essential oil mainly composed of oxygenated compounds 51.35-59.74% while monoterpene
hydrocarbons and sesquiterpenes constituted 38.86-47.43% and 0.36-0.6% of it, respectively.
Seven compounds were found in all samples: [beta]-myrcene, 1,8-cineole, artemisia ketone, artemisia alcohol, camphor, [beta]-caryophyllene, and (E)-[beta]-farnesene, and among them the most abundant were irregular monoterpene
artemisia ketone (16.5%-46.4%) and regular monoterpene