Abstract

GONZALEZ CORIA, Johana C.  and  HORIANSKI, Marta A.. In vitro Antibacterial activity of dry hydroalcoholic extracts of elaborated Yerba Mate produced in Paraguay. Rev. cienc. tecnol. [online]. 2018, n.30, pp.1-10. ISSN 1851-7587.

Yerba mate (llex paraguariensis) is a plant species with diverse nutritional and medicinal properties, whose crushed dried leaves are made into infusions. The antibacterial activity of dried hydroalcoholic extracts of yerba mate elaborated on bacteria of importance in food has been evaluated (Escheríchia coli, Salmonella Enteritidis, Pseudomonas aeruginosa and Staphylococcus aureus) by agar diffusion methods. The minimum inhibitory concentration and the minimum bactericidal concentration have been determined. Preliminary phytochemical analysis has been made and total polyphenols have been quantified. Staphylococcus aureus and Salmonella Enteritidis were inhibited by the extracts. The hydroethanolic extract (60:40) has shown greater inhibitory capacity. Staphylococcus aureus presented a greater inhibition halo size with MIC/MBC of 0.78/0.78 mg/mL. The presence of tannins, flavonoids, saponins and a total polyphenol content of 24.47 g EAG/100 g dry sample have been found. The extracts obtained could be used as potential natural preservatives in foods.

Keywords : Yerba mate; Antibacterial activity; Hydroalcoholic extracts; Phytochemicals; Total polyphenols.

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