Evaluation of antioxidant capacity, phenolic content, antimicrobial and cytotoxic properties of Guettarda uruguensis flowers and fruits

Abstract

Antioxidant capacity, phenolic content, antimicrobial and cytotoxic properties of extracts and fractions from flowers and fruits of G. uruguensis were evaluated. Total phenolic content ranged between 406.8 ± 20.47 and 57.98 ± 1.734 gallic acid equivalent in mg g-1 (mg GAE g-1) samples. Ethyl acetate and butanol fractions from flowers had the greatest rates in phenolic content and antioxidant activity in 1,1diphenyl-2-picrylhydrazyl (DPPH) and thiobarbituric acid reactive substances (TBARS) assays. Pearson´s coefficient showed a strong association between total phenolic compounds in DPPH (r =-0.83, p < 0.01) and TBARS (r = 0.85, p < 0.01). Eleven out of the 12 samples tested were toxic in the brine shrimp assay (LC50 < 100 µg mL-1). Antimicrobial susceptibility profile revealed flower remaining fraction and fruit extract with moderate activity against Enterococcus faecalis. Results indicate that G. uruguensis is a good source of compounds with antioxidant and cytotoxic activities. Further studies to identify compounds causing these activities are recommended.

Un nuevo sistema de monitoreo para la broca del café Hypothenemus hampei Ferrari, 1837 (Coleoptera: Curculionidae: Scolytinae) en México

“…Asimismo, se ha reportado que en la etapa de maduración de las bayas se liberan kairomonas, esteres y algunos alcoholes que atraen a las hembras en etapa de reproducción (Giordanengo et al 1993;Ortiz et al 2004;Mathieu et al 2009;Mendesil et al 2009;Cruz y Malo 2013;Aristizábal et al 2015). Otros autores como Duarte et al (2016) y Souza et al (2018) encontraron al acetato de etilo; un éster presente en flores y frutos maduros de la familia de rubiáceas que al ser liberados atraen a insectos de la familia Curculionidae, lo que explica el tercer pico poblacional que ocurrió en julio de 2020, y que coincide con las lluvias de verano (Fig. 1).…”