Determination of volatile components and antioxidant properties of endemic Sideritis spp. taxa of Geyik Mountain (Gündoğmuş/Antalya)

In this master's thesis study, the volatile compounds and antioxidant properties of Sideritis libanotica subsp. linearis (Benth.) Bornm., Sideritis libanotica subsp. libanotica and Sideritis phrygia Bornm. taxa naturally distributed in Geyik Mountain (Gündoğmuş/Antalya) were determined. In the study, 56 volatile compounds were detected in S. libanotica subsp. linearis, 47 S. libanotica subsp. libanotica and 72 S. phrygia. Main components in S. libanotica subsp. linearis; trans-Caryophyllene (19.33%), Bicyclogermacrene (9.79%), Limonene (9.72%), beta-Pinene (8.40%), alpha-Pinene (7.88%), in S. libanotica subsp. libanotica; alpha-Pinene (25.81%), beta-Phellandrene (19.73%), beta-Myrcene (11.45%), beta-Pinene (8.43%), Bicydoermacrene (6.18%) and in S. phrygia; trans-Carophyllene (222.80%), beta-Myrcene (10.53%), alpa-Piene (9.16%), Limonene (8.06%) and beta-Piene (6.62%) were determined. As a result of variance analysis, the CV value of DPPH and Cuprac antioxidant capacities were within the acceptable range. At the same time, both antioxidant scavenging capacities were found to be statistically significant at 1% level. While S. libanotica subsp. linearis population had the highest DDPH antioxidant capacity, S. libanotica subsp. libanotica and S. phrygia populations were in the same group. While S. phrygia population had the highest Cuprac antioxidant capacity, S. libanotica subsp. linearis and S. libanotica subsp. libanotica populations were in the same group. The difference between the genotypes in the amount of total phenolic substance was statistically insignificant and all genotypes were in the same group.