ANTIOXIDANT AND ANTIMICROBIAL POTENTIAL OF ESSENTIAL OILS FROM NATIVE PLANTS OF LA RIOJA

BARBIERI NATALIA; SAYAGO MARÍA; MARTINEZ LORENA; BENAVENTE ALBA

Tafí del Valle, Tucumán

Jornada; XXXIV ANNUAL SCIENTIFIC MEETING OF TUCUMAN BIOLOGY ASSOCIATION; 2017

Essential oils (EOs) are important natural products used as flavours and fragrances. Currently, there is increasing interest in the characterization of biological properties of EOs due to their potential applications. The antioxidant and antimicrobial activity of EOs from Lippia turbinata, Clinopodium gilliesii, Lippia integrifolia, Zuccagnia punctata and Senecio eriophyton were evaluated in native plants of La Rioja. The EOs were obtained by hydro-distillation. Antioxidant activity was determined using DPPH radical scavenging assay. The EOs were tested using the agar dilution method against six pathogenic bacteria such as Escherichia coli, Salmonella typhimurium, Pseudomonas aeruginosa, Staphylococcus aureus, Streptococcus agalactiae and Streptococcus pneumoniae. The antifungal activity of EOs on spore germination of Verticillium dahliae and Penicillium glabrum phytopathogens was determined. Results of antimicrobial assays were expressed as minimum inhibitory concentration (MIC).L. turbinata EO was the most active DPPH radical scavenger while the other oils studied showed low potency as antioxidants. EOs from L. integrifolia, C. gilliesii and S. eriophyton were effective against Gram-positive bacteria. The L. integrifolia EO was the most active one against S. agalactiae and S. pneumonia (MIC =2.5 mg/mL) while the S. eriophyton EO was the most effective one against S. aureus (MIC =2.5 mg/mL). Only the C. gilliesii EO was able to inhibit the growth of E. coli and S. typhimurium Gram-negative bacteria. The EOs of C. gilliesii and Z. punctata showed marked inhibitory activity on spore growth of V. dahliae (MIC= 3 mg/mL).Results suggest that native plants from La Rioja would be a good source of natural products of agronomical and pharmaceutical interest