Avaliação Antimicrobiana do Extrato Alcóolico de Syzygium cumini sobre Bacillus cereus e Candida spp. e Produção de Biossurfactante

Abstract

Syzygium cumini, commonly known as “jambolan”, has good health benefits, as it has hypoglycemic, anti-inflammatory, antianemic, antibacterial, antioxidant properties, among others. Biological surfactants have properties of great interest for bioremediation, such as low toxicity, biodegradability, emulsifying and surfactant activity, and the possibility of production from renewable sources. Therefore, the objective is to evaluate the antimicrobial potential of the alcoholic extract of Syzygium cumini in cultures of Bacillus cereus and Candida spp., as well as the biotechnological potential of the aqueous extract as a substrate for the production of biosurfactant. This is an experimental study, with tests carried out in a Microbiology Laboratory, using the alcoholic and aqueous extracts of the Syzygium cumini leaf. It was observed that the Minimum Inhibitory Concentration for Candida spp. was 500mg/ml and showed a moderate growth inhibition at a concentration of 250mg in addition, there was no inhibition of the growth of B. cereus. The bacterium, in turn, showed good production of biosurfactant from the use of kerosene, however, the emulsions have little stability when using the extract as a source of nutrients, presenting a demulsifying activity. In addition, basification and higher temperatures contribute to the instability of these emulsions. Therefore, the extract showed moderate antimicrobial activity against Candida spp. and showed no inhibition for B. cereus. As for the production of biosurfactants, the extract is not efficient to promote the stability of emulsions, thus presenting an opposite effect, accelerating and helping in the separation of the phases.