Bactericide and antimicrobial effects of ethanolic extracts of propolis and geopropolis of stingless bees natives from the state of Paraná in multi-resistant microorganisms / Efeitos bactericidas e antimicrobianos de extratos alcoólicos de própolis e geoprópolis de abelhas sem ferrão, nativas do estado do Paraná, em microorganismos multi-resistentes

Abstract

The value of ecosystem concerning for the maintenance of riparian forests for the protection of water bodies can be essential to the preservation of natural resources, fauna and flora, and all of them inter-connected. Native stingless bees are fundamental pollinating agents for food production, besides the production of propolis and geopropolis, being each of these products, with local characteristics, depending on the vegetation available. The preservation of riparian forests enhances the insertion of meliponaries in communities bordering superficial water bodies and emphasizes the socio-environmental importance because this activity can be an extra source of income for small rural producers. In this work, the antimicrobial and antibacterial potential of propolis from stingless bees, native from the State of Paraná - Brazil, was examined, whose products can be extremely important considering its socio-economic and environmental view. Ethanolic extracts of propolis and geopropolis of native bees were tested according the antimicrobial and bactericidal capacity. The test was conducted with ethanolic extract of Africanized bees, in order to use it as control. The ethanolic extract of propolis and geopropolis of tested species showed to be effective as bactericide for the strains of bacteria Pseudomonas aeruginosa (gram-positive) and Klebsiella planticola, Escherichia coli, Raoutella planticola (gram-negative). In addition, it was observed that fungi can be inertized in honey by reducing the moisture content and the chemical defense barrier due to the substances present in the propolis and geopropolis against microorganisms. Inside the hives bees use propolis/geopropolis as sanitizer, to promote the fixation of microorganisms. In addition to pollination, the hives have an important function as controlling pests and pathogens.