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Phytochemical screening and comparative antimicrobial potential of different extracts of Stevia rebaudiana Bertoni leaves
Affiliation:1. Faculdade de Ceilândia, Universidade de Brasília, Brasília, Brazil;2. Institute of Chemical Technology, Nathalal Parekh Marg, Matunga, Mumbai 400 019, India;3. Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Brazil
Abstract:ObjectiveTo evaluate in vitro antimicrobial potential and phytochemical screening of the crude extracts of leaves of Stevia rebaudiana Bertoni.MethodsThe essential oil and crude extracts were prepared by using different usual method. Antimicrobial and antifungal activities were measured by the well established methods.ResultsHighest antifungal index [(12.13±0.08) mm)] and lowest antifungal index [(9.13±0.04) mm] as well as highest antibacterial index [(11.89±0.07) mm] and lowest antibacterial index [(7.24±0.03) mm] were obtained for extracts B, H, A and F, respectively. Invariably extract C, E, I, J and H did not show antimicrobial activity. The extract F showed all antifungal and antibacterial activity except Bacillus cereus and Bacillus megaterium.ConclusionsThe above findings support the idea that plant extracts of Stevia rebaudiana Bertoni leaves may have a role to be used as pharmaceuticals or preservatives.
Keywords:Antimicrobial property  Plant extracts  Antibacterial index  Antifungal index
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