Chemical profile, nutraceutical and anti-phytobacterial properties of the essential oil from Dalea foliolosa (Fabaceae)

The present work describes the chemical composition of the leaf essential oils from the annual plant Dalea foliolosa, which was collected in three consecutive years (2014-2016). The amount of monoterpenes (69.5-84.6%) was higher to that of sesquiterpenes (10.3-22.9%) and aliphatic hydrocarbons (1-2.1%). Cryptone (22.3-30.6%) was the most abundant oxygenated monoterpene, followed by linalool (10.4-17.6%), caryophyllene oxide (4.6-15.3%), ascaridole (4.5-7.4%) and beta-citronellol (3.8-5.6%). The hydrodistillated extract showed antioxidant activity against DPPH radical (IC50, 45-156 mu g mL(-1)), strong anti-a-glucosidase activity (IC50, 14-47 mu g mL(-1)) and inhibited the growth of Pseudomonas syringae pv. tabaci TBR2004 (MIC, 44-105 mu g mL(-1)) and P. syringae pv. tomato DC3000 (MIC, 35-155 mu g mL(-1)). The possible use of the essential oil as a novel additive for anti-hyperglycemic supplements and for the biological control of the analyzed Pseudomonas syringae varieties, may be contemplated.