Abstract

RODRIGUEZ-RODRIGUEZ, Laura D. et al. Antimicrobial activity of peels and seeds of Citrus limonia and Citrus sinensis. Actu Biol [online]. 2017, vol.39, n.106, pp.53-59. ISSN 0304-3584.  https://doi.org/10.17533/udea.acbi.v39n106a05.

The antimicrobial activity of ethanol extracts and fractions in n-hexane, ethyl acetate, dichloromethane, and water-ethanol obtained from seeds and peels of Citrus limonia and Citrus sinensis, against Aspergillus niger, Botrytis cinerea, Phytophthora cinnamoni, and Rhizopus oryzae was evaluated. The inhibitory effect of various extracts was measured on mycelial growth, sporulation, and damage on microscopic morphology of microorganisms by the following methods: optical density and agar diffusion, determining the inhibitory effect on mycelial growth, sporulation, and microscopic morphology of plant pathogens; the extracts were characterized by thin layer chromatography, verifying the presence of secondary metabolites of flavonoid type, alkaloid, and limonoids. A differential behavior arises in the antimicrobial activity of different treatments, being the most active dichloromethane shells extracts, and in this order with increased activity in the dichloromethane fraction of C. limonia. The inhibitory effect on the microorganisms tested was observed at concentrations close to 7 mg/ml, the result of micromorphological damage on hyphae and reproductive structures such as sporangia and conidia, which were dependent on the extracts concentration. The results suggest that residues as agribusiness citrus peels are a source of metabolites with antimicrobial potential in controlling agriculturally important plant pathogens.

Keywords : biopesticides; citrus waste; phytopathogenic microorganisms; secondary metabolites.

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