Caracterização química e atividades antioxidante e antifúngica do óleo essencial das flores de [Cochlospermum regium (Mart. ex Schrank.) Pilger] (Bixaceae)

Abstract

<p class="Normal1">The objective of this work was to characterize the chemical and physicochemical profile, and the antioxidant and antifungal activities of the essential oil from Cochlospermum regium flowers. The flowers were collected in a riparian Cerrado area. The essential oil was extracted by hidrodestilation in Clevenger. The organoleptic parameters were evalueted for (color, visual and aroma), for physicochemical, yield (%), solubility, optical rotation (αD ), refractive index (20 °C) and density (25 °C g mL-1), antioxidant activity were determined by the reduction of free radical DPPH, and the antifungal activity was determined through the percentage of growth inhibition on Sclerotinia sclerotiorum, Colletotrichum gloeosporioides and Aspergillus flavus. The essential oil from C. regium flowers had an oily, clear, crystalline and strongly aromatic liquid, yield of 0.099%, positive solubility, optical rotation +36.1 αD , refractive index 1.3297 20 °C, relative density of 0.933 g mL-1. The chemical profile showed the following major compounds ocimene<(E)-β-> with 15.87%, caryophyllene E 11.53%, γ-muurolene 20.07%, bicyclogermacrene 16.11% and, rosifoliol with 31.09%. The antioxidant activity showed high efficiency in reducing of the DPPH radical in all concentrations varied between 50 to 0.031 mg mL -1 between 95.25% to 40.09%. The antifungal activity showed 100% of mycelial inhibition in 100 and 50 µL mL-1 concentrations for S. sclerotinia, C. gloeosporioides and A. flavus. In the lowest concentration of 1.56 µL mL-1 inhibition was also observed for S. sclerotiorum and A. flavus and for 3.13 µL mL-1 for C. gloeosporioides with 26.12; 6.08 and 10.07%, respectively. The essential oil of the flowers from C. regium proved to be an efficient natural product for the development of medicines, as an antioxidant agent and, antifungal for agricultural use.</p>