Juniperus oxycedrus L. subsp oxycedrus and Juniperus oxycedrus L. subsp macrocarpa (Sibth. & Sm.) Ball. berries from Turkey: Comparative evaluation of phenolic profile, antioxidant, cytotoxic and antimicrobial activities

This work aimed to evaluate and compare the phenolic profile and some biological properties of the ripe berries methanol extracts of Juniperus oxycedrus L. subsp. oxycedrus (Joo) and Juniperus oxycedrus L subsp. macrocarpa (Sibth. & Sm.) Ball. (tom) from Turkey. The total phenolic content resulted about 3-fold higher in Jom (17.89 +/- 0.23 mg GAE/g extract) than in Joo (5.14 +/- 0.06 mg GAE/g extract). The HPLC-DAD-ESI-MS analysis revealed a similar flavonoid fingerprint in Joo and Jom, whereas a difference in their quantitative content was found (4632 mu g/g extract and 12644 mu g/g extract). In addition, three phenolic acids were detected in Jom only (5765 mu g/g extract), and protocatechuic acid was the most abundant one. The antioxidant capacity of the extracts was evaluated by different in vitro assays: in the DPPH and in the TBA tests a stronger activity in Jom was highlighted, while Joo exhibited higher reducing power and metal chelating activity. Joo and Jom did not affect HepG2 cell viability and both extracts resulted virtually non-toxic against Artemia sauna. The extracts were also studied for their antimicrobial potential, displaying efficacy against Gram-positive bacteria. (C) 2013 Elsevier Ltd. All rights reserved.