Antifungal effects of Curcuma longa L. essential oil against pathogenic strains isolated from indoor air
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ORIGINAL PAPER
Antifungal effects of Curcuma longa L. essential oil against pathogenic strains isolated from indoor air Erasmo Ga´mez-Espinosa
. Matilde Anaya . Pedro Borges . Diana Marelys Bosch Crespo
Received: 26 August 2019 / Accepted: 3 November 2020 Ó Springer Nature B.V. 2020
Abstract Curcuma longa L. essential oil can be considered a natural product with strong antifungal activity due to the fungicidal and fungistatic effect. It can be used for the aeromycological control of premises where food is prepared. It is important to monitor air quality in food production facilities to achieve safe food. The objective of this work was to evaluate the antifungal activity of C. longa essential oil on potentially pathogenic and biodegradable strains isolated from the indoor of the food industry. A suspension of 106 spores/mL of the strains Aspergillus flavus, Penicillium brevicompactum and Cladosporium cladosporioides was prepared. Two
Erasmo Ga´mez-Espinosa and Matilde Anaya have contributed equally to this work. E. Ga´mez-Espinosa (&) Centro de Investigacio´n y Desarrollo en Tecnologı´a de Pinturas (CONICET-CICPBA-UNLP), Ave 52 entre 121 y 122, La Plata, Buenos Aires, Argentina e-mail: [email protected]
natural biocides (C. longa essential oil and Cuban propolis) and two synthetic ones (antiseptic detergent and Tween 20) at different concentrations (0, 0.001, 0.1 and 1.0% v/v) were evaluated. The superficial growth of the mycelium (cm) and the germination inhibition (%) were the response variables. In addition, the minimum inhibitory concentration (MIC) of EO was determined by radial growth total inhibition (IRG) and partial sporulation inhibition (PIS). A. flavus colony diameter was decrease inversely proportional to the concentrations, and at 1% v/v it reduced more than three times its diameter, being selected as MIC since it caused IRG and PIS. Germination inhibition of the spores of the three strains was observed in relation directly proportional to the concentration of the four biocides. All spores with values similar to antiseptic detergent were inhibited by the essential oil at MIC (1%) between 41 and 55% Keywords Antifungal activity Essential oil Aeromycology Indoor environments
M. Anaya Grupo Empresarial de la Industria Alimentaria, Ave. La Pesquera y Atares, Habana Vieja, La Habana, Cuba P. Borges Instituto de Investigaciones para la Industria Alimentaria, Guatao km 3 , Lisa, La Habana, Cuba D. M. Bosch Crespo Universidad de Salamanca, Patio de las Escuelas 1, Salamanca, Castilla y Leo´n, Espan˜a
1 Introduction Bioaerosols are mainly composed of fungal particles, bacteria and plant pollen grains, fungi being responsible for the release mycotoxins into indoor
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Aerobiologia
environments (Malta-Vacas et al. 2012). Filamentous fungi manifest the highest biodeteriorating activity of organic matter due to their exoenzymatic activity (Anaya et al. 2016; Rojas and Aira 2012), which is why they are capable of degrading raw materials
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