Resumo

LONDONO C., Juan D. et al. ANTIMICROBIAL EVALUATION OF EXTRACTS OBTAINED FROM TITHONIA DIVERSIFOLIA (HEMSL.) A. GRAY WITH POTENTIAL USE IN THE DAIRY INDUSTRY. Investig. andina [online]. 2020, vol.22, n.40, pp.215-224.  Epub 18-Jun-2020. ISSN 0124-8146.

Antibiotics used as a treatment for mastitis in the dairy industry have brought a problem with a potential impact on public health, such as antimicrobial resistance. The objective of this study is to evaluate the antimicrobial action of alcoholic extract from Tithonia diversifolia's leaves, stems, and flowers on the growth of Staphylococcus aureus and Escherichia coli in in vitro cultures. The inhibitory effect on bacterial growth was evaluated through a sensitivity test. In both bacteria, the positive control presented an inhibition halo greater than 30 mm, with a significant difference from the extracts of T. diversifolia, which presented, for S. aureus, a halo of 9.7 and 10.4 mm and for E. coli of 6.5 and 9.4 mm for stem-leaf and flowers respectively. The alcoholic extract of T. diversifolia flowers is emerging as a potential tool to inhibit bacterial growth.

Palavras-chave : Alcoholic extract; bioassay; Escherichia coli; inhibition halo; mastitis; Staphylococcus aureus.

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