Natural antioxidants, such as fruits and vegetables, can neutralize an excess of free radicals in the organism and prevent certain degenerative diseases. Blackberries are known to exhibit antioxidant properties, but this fruit is seldom consumed or commercialized in Peru. The objective of this research study was to determine the total anthocyanins (TA), total phenolic compounds (TPC) and antioxidant capacity of lyophilized Rubus robustus C. Presl (wild blackberries) in the region of Arequipa - Peru. The pH-differential method, the Folin- Ciocalteu method and the free radical 2,2-diphenyl-1-picrylhydrazyl hydrate (DPPH) method were used to this end. Results showed a TA content of 52 ± 1.86 mg cyanidin 3-glucoside/100 g of lyophilized Rubus robustus C. Presl. Furthermore, the TP content was of 219.11 ± 8.23 mg gallic acid/100 g of the lyophilized fruit. The percentage of DPPH discolorati...