In vitro study reveals antimicrobial activity of essential oils against Klebsiella pneumoniae isolates from Nile tilapia

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Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorNúcleo de Pesquisa em Microbiologia Ambiental-
Autor(es): dc.contributorFaculdade de Ciências Agrárias-
Autor(es): dc.creatorVaneci-Silva, D.-
Autor(es): dc.creatorNakamura-Silva, R.-
Autor(es): dc.creatorOliveira-Silva, M.-
Autor(es): dc.creatorPitondo-Silva, A.-
Autor(es): dc.creatorAssane, I. M.-
Autor(es): dc.creatorPilarski, F.-
Data de aceite: dc.date.accessioned2025-08-21T17:51:04Z-
Data de disponibilização: dc.date.available2025-08-21T17:51:04Z-
Data de envio: dc.date.issued2025-04-29-
Data de envio: dc.date.issued2023-12-31-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1590/1519-6984.285556-
Fonte completa do material: dc.identifierhttps://hdl.handle.net/11449/297783-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/297783-
Descrição: dc.descriptionRecent studies have shown a growing presence of Klebsiella pneumoniae in aquatic environments, raising concerns for fish production due to its resistance to many antimicrobials. This bacterium is commonly associated with urinary tract infections, pneumonia, and septicemia in humans. Controlling bacterial infectious diseases in fish is a significant challenge in aquaculture. In Brazil, only florfenicol and oxytetracycline are approved for use in this sector. Therefore, in this study, we assessed the in vitro antibacterial impact and hemolytic activity of 16 essential oils (EOs) and two frequently used antimicrobial agents in aquaculture (florfenicol and oxytetracycline) against seven strains of K. pneumoniae isolated from Nile tilapia. The EOs were characterized chemically using gas chromatography with a flame ionization detector and verified with mass spectrometry. The microdilution technique using 96-well plates was employed to evaluate the minimum inhibitory concentration (MIC), ranging from 0.078125 to 20 µg mL-1 for essential oils (EOs) and from 0.0075 a 64 µg mL-1 for antimicrobials. To determine the minimum bactericidal concentration (MBC), 10 µL aliquots from wells that did not show growth in the MIC tests were cultured on Petri dishes containing Muller Hinton Agar. The hemolytic activity of the EOs was evaluated using an erythrocyte lysis assay. The primary components of Thymus vulgaris were thymol (53.3%) and p-cymene (20.8%), while those of Melaleuca alternifolia were 1-terpinen-4-ol (40.5%), γ-terpinene (19.7%), and α-terpinene (1.6%). Significant hemolytic activity was only observed in M. alternifolia tests (>33% lysis). T. vulgaris EO exhibited the highest activity against K. pneumoniae strains, while M. alternifolia EO demonstrated MIC and MBC against all strains. EOs from Corymbia citriodora, Artemisia vulgaris, Citrus bergamia, Cananga odorata, Boswellia carterii, and Pelargonium peltatum also yielded positive results. All strains were resistant to the tested antimicrobial agents. Based on these findings, T. vulgaris was the most promising EO for treating K. pneumoniae in fish.-
Descrição: dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)-
Descrição: dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)-
Descrição: dc.descriptionUniversidade Estadual Paulista – UNESP Centro de Aquicultura da UNESP – CAUNESP, SP-
Descrição: dc.descriptionUniversidade de Ribeirão Preto – UNAERP Núcleo de Pesquisa em Microbiologia Ambiental, SP-
Descrição: dc.descriptionUniversidade Zambeze – UniZambeze Faculdade de Ciências Agrárias, Tete-
Descrição: dc.descriptionUniversidade Estadual Paulista – UNESP Centro de Aquicultura da UNESP – CAUNESP, SP-
Descrição: dc.descriptionCAPES: 001-
Descrição: dc.descriptionCNPq: 301508/2019-4-
Descrição: dc.descriptionCNPq: 316321/2021-4-
Idioma: dc.languageen-
Relação: dc.relationBrazilian Journal of Biology-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectantimicrobial activity-
Palavras-chave: dc.subjectaquatic animal health management-
Palavras-chave: dc.subjectbacterial disease-
Palavras-chave: dc.subjecterythrocyte lysis assay-
Palavras-chave: dc.subjectKlebsiella pneumoniae-
Título: dc.titleIn vitro study reveals antimicrobial activity of essential oils against Klebsiella pneumoniae isolates from Nile tilapia-
Título: dc.titleEstudo in vitro revela atividade antimicrobiana de óleos essenciais contra cepas de Klebsiella pneumoniae isoladas de tilápia-do-Nilo-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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