Tribuloside is a flavonoid that has been found in T. terrestris and has antibacterial and antioxidant activities.1 It is active against the mycobacteria M. madagascariense and M. indicus pranii (MICs = 0.8 and 1.6 mg/ml).2 Tribuloside scavenges DPPH radicals when used at concentrations ranging from 63.7 to 75.2 mg/ml.
1.Bhutani, S.P., Chibber, S.S., and Seshadri, T.R.Flavonoids of the fruits and leaves of Tribulus terrestris: Constitution of tribulosidePhytochemistry8(1)299-303(1969) 2.Christopher, R.J., Nyandoro, S.S., Chacha, M., et al.A new cinnamoylglycoflavonoid, antimycobacterial and antioxidant constituents from Heritiera littoralis leaf extractsNat. Prod. Res.28(6)351-358(2014)