Evaluation of coumarin content and antifungal activity of Cumaru oil fractions
DOI:
https://doi.org/10.6008/CBPC2179-6858.2018.006.0008Keywords:
Fungitoxic Action, Alternative Control, Dipteryx sp., Fixed oilsAbstract
Cumaruzeiros are neotropical trees originating from Central and South American countries. The fruits stand out for their commercial and phytotherapic potentialities, and their seeds, for over a century, have been marketed by Amazonian extractivists. This study aimed to analyze the coumarin content (1,2-benzopyrone) and the antifungal activity of oil fractions obtained from cumaru seeds produced in the municipality of Alenquer, Pará, Brazil. The fractions were obtained by successive cold extractions using Hexane P.A., Dichloromethane P.A., and 96% Ethyl Alcohol P.A. The 1,2-benzopyran content in the fractions was chemically analyzed by Thin Layer Chromatography (CCD) and Mass Spectrometry Coupled Gas Chromatography (GC-MS). In the antifungal assay, fractions were diluted in potato-dextrose-agar (BDA) culture medium to obtain concentrations of 10%, 20%, 30%, 40% and 50% and poured into Petri dishes for phytopathogen deposition. after solidification. Control consisted of fungus sowing only in BDA medium. The phytopathogen Colletotrichum musae isolated from banana was used as a challenge. The highest yield was obtained in hexane fraction (14.4%), and coumarin isolated from this fraction corresponded to 3.4% of this yield. The dichloromethane fraction was the most effective in reducing the phytopathogen mycelial growth at all concentrations tested.
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