In the present study the radical scavenging and inhibition of lipid peroxidation of Tribulus terrestris commercial preparations were investigated for the first time. The obtained results of antioxidant activity were also compared with the values of reference synthetic antioxidant. In addition the quantification of the total polyphenols and flavonoids was carried out.
Numerous studies revealed DPPH radical scavenging activity of extracts from different well known medicinal plants as Hypericum, Acacia catechu, Citrus limon, Stevia rebaudiana, Trigonella foenum-graecum as well as Tribulus terrestris ethanol extract. However, no detailed evaluation of antioxidant capacity with different in vitro methods on TT commercial preparations was undertaken so far.