Headspace solid phase microextraction combined with GC-MS for the analysis of volatile compounds of Calystegia silvatica (Kit.) Griseb. from Algeria.

This study represents the first investigation of the volatile composition of Calystegia silvatica (Convolvulaceae) collected in Algeria, using headspace solid-phase microextraction and gas chromatography/mass spectrometry (HS-SPME-GC/MS). This technique allowed the identification of 44 compounds, constituting 96.9% of the total components. These compounds belong to various chemical classes, including sesquiterpene hydrocarbons (22) and non-terpene derivatives (13), as major groups. Remarkably, the volatile profile of C. silvatica was dominated by sesquiterpenoids (87.1%), particularly sesquiterpene hydrocarbons (83%). Analysis of the aroma profile revealed that the main metabolites were β-caryophyllene, α-gurjunene and germacrene D. Oxygenated sesquiterpenes were present in a smaller proportion (4.1%), mostly represented by palustrol. Other chemical classes, such as monoterpene hydrocarbons, oxygenated monoterpenes, non-terpene derivatives and apocarotenes, have been found in limited quantities. It is worth noting that the data presented in this study have not previously been reported for Calystegia species.