Comparison of essential oils from Cistus species growing in Sardinia

Cistus genus is present in Sardinia with large populations of C.
monspeliensis, C. salvifolius, C. creticus subsp. eriocephalus and few
stations of C. albidus, C. creticus subsp. creticus and C. creticus subsp.
corsicus. No chemical studies are currently being carried on Cistus
species of Sardinia. The essential oils have shown six different profiles.
C. creticus subsp. eriocephalus showed a high amount of manoyl
oxide and its isomer (70%). C. salvifolius has pointed out the group of
labdans, (20%); another consistent percentage is made of perfumed
molecules as ionone and its derivate. Several linear hydrocarbons
were produced by C. monspeliensis, and the heneicosane was the
most represented element. In C. albidus no labdane-type diterpenes
were identified. Analysis of C. creticus subsp creticus revealed several
oxygenated sesquiterpenes and labdane-type diterpenes, especially
manoyl oxide. C. creticus subsp. corsicus was qualitatively very similar
to C. creticus subsp. creticus, notably concerning the labdane-type
compounds.