RESUMO
The indiscriminate use of antibiotics has contributed to the emergence of multiresistant bacteria. Faced with this, the search for antibiotics from plants has proven to be a promising alternative. The objective of this work was to isolate and identify Staphylococcus sp. resistant to methicillin of the ocular surface of dogs with ophthalmopathies and to evaluate its susceptibility to alcoholic extract of the bark and hexane extract of the pulp of Caryocar brasiliense. Biological material was collected from the ocular surface of 21 dogs presenting ophthalmopathies. We isolated 64 S. pseudintermedius, among these, 4 isolates were identified as methicillin-resistant S. pseudintermedius (MRSP). The alcoholic extract of C. brasiliense peel was able to inhibit the bacterial growth of MRSP isolates at a concentration of 2.2%. Thus, the extract from the C. brasiliense peel has antimicrobial potential and represents an alternative in the control of MRSP.
O uso indiscriminado de antibióticos tem contribuído para o surgimento de bactérias multirresistentes. Diante disso, a busca por antibióticos a partir de plantas tem se mostrado uma alternativa promissora. O objetivo deste trabalho foi isolar e identificar Staphylococcus sp. resistente à meticilina da superfície ocular de cães com oftalmopatias e avaliar sua susceptibilidade ao extrato alcoólico da casca e ao extrato hexânico da polpa de Caryocar brasiliense. O material biológico foi coletado da superficie ocular de 21 cães com oftalmopatia. Isolaram-se 64 S. pseudintermedius; entre esses, quatro isolados foram identificados como S. pseudintermedius resistente à meticilina (MRSP). O extrato alcoólico da casca de C. brasiliense foi capaz de inibir o crescimento bacteriano dos isolados de MRSP na concentração de 2,2%. Dessa forma, o extrato da casca de C. brasiliense possui potencial antimicrobiano e representa uma alternativa no controle de MRSP.
Assuntos
Animais , Cães , Staphylococcus/imunologia , Resistência a Meticilina , Malpighiales/química , Fitoterapia/veterinária , Reação em Cadeia da Polimerase/veterinária , Oftalmopatias/terapiaRESUMO
New therapeutic approaches are necessary to control strongyloidiasis due to the side effects of, and resistance to, currently available drugs thiabendazole, albendazole, and ivermectin. This study examined the anthelmintic properties of extracts and isolated compounds from Siparuna guianensis against Strongyloides venezuelensis eggs and larvae, using the egg hatching test (EHT) and larval motility test (LMT). Albendazole (0.025 mg/ml) and ivermectin (0.316 mg/ml) were used as the positive controls for the EHT and LMT assays, respectively. Strongyloides venezuelensis eggs or larvae (±50 specimens) were treated with ethanol extract (0.05-1.0 mg/ml), ethyl acetate and aqueous fractions (0.05-0.8 mg/ml), essential oil (0.2-1.0 mg/ml) and α-bisabolol (0.2-1.0 mg/ml) from S. guianensis, and analysed by optical microscopy after 48 h (EHT), or after 24, 48 and 72 h (LMT). All the tested compounds exhibited ovicidal activity equivalent to the positive control and changed the morphology of the eggs. The S. guianensis ethanol extract and aqueous fraction were as effective as the positive control. Phytochemical analysis of the ethanol extract and fractions revealed the presence of phenolic compounds, tannins and flavonoids. Therefore, S. guianensis is effective against S. venezuelensis eggs and larvae in vitro, and can be considered as a potential alternative treatment for strongyloidiasis.