guajava fresh leaves is composed mainly by hydrocarbon sesquiterpenes (62.0%), followed by oxygenated sesquiterpenes (14.8%), hydrocarbons monoterpenes
(1.8%), and oxygenated monoterpenes
(1.2%) (Table 1).
is known to produce biologically active compounds such as oligostilbenoids and monoterpenes
. Oligostilbenoids are known to have antifungal activity.
Turpentine is composed of terpenes which mainly consist of the monoterpenes
such as alpha-pinene and beta-pinene with small quantities of careen, dipentene, camphene and terpinolene.
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.
These compounds were grouped into phenylpropanoids, major compounds (2.64-71.52%), sesquiterpenes (5.40-6.38%), monoterpenes
(0.17-4.04%), oxygenated monoterpenes
(0.34-0.82%), and oxygenated sesquiterpenes (0.97-1.29%).
It is believed that the relatively high solubility in water and the presence of an alcohol group contribute to the antimicrobial activity of alcoholic monoterpenes
, which may cause protein denaturation or dehydration of vegetative cells .
Iridoids may be envisaged as a biogenetic alternative to the typical monoterpenes
and there is evidence for an inverse relationship between the production of monoterpenes
and iridoids in the Lamiaceae family .
Phytochemical analysis screening from the crude ethanolic extracts of dayak onions was tested for the presence of alkaloids, flavonoids, polyphenols, monoterpenes
and sesquiterpenes, steroids and triterpenoids, and quinones, as results shown in Table 1.
in wines, wine lactone has the most potent odor.
The CTR and LRK sites experienced isoprene-dominated biogenic emissions, with high coemission of monoterpenes
, substantial aerosol liquid water concentrations (T.
Essential oils of seven Eucalyptus species were found rich in monoterpene
hydrocarbons and oxygenated monoterpenes
Bordelon noted that the proper development of Traminette's monoterpenes
, the aromatic compounds, depends upon good exposure to sunlight.