ABSTRACT:The infl ammatory reaction is a response of the organism against an injury and it involves the action of complex events and mediators through of the blood vessels. The present work is a literature survey of the extracts of plants with anti-infl ammatory activity studied in Brazil. The review refers to 75 plants with their families, parts used, type of extract used, bioassay models and their activity.
Mucormycoses are emerging infections that have high rates of morbidity and mortality. They show high resistance to antifungal agents, and there is a limited therapeutic arsenal currently available, therefore, there is a great need to give priority to testing therapeutic agents for the treatment of mucormycosis. Along this line, the use of essential oils and phytoconstituents has been emphasized as a new therapeutic approach. The objective of this work was to investigate the antifungal activity of the essential oil (EO) of Thymus vulgaris, and its constituents thymol and p-cymene against Rhizopus oryzae, through microbiological screening, determination of minimal inhibitory concentration (MICs) and minimal fungicidal concentration (MFCs), effects on mycelial growth and germination of sporangiospores and interaction with ergosterol. The MIC of EO and thymol varied 128–512 µg/mL, but the MFC of EO and thymol varied 512–1024 µg/mL and 128–1024 µg/mL, respectively. The results also showed that EO and thymol significantly inhibited mycelial development and germination of sporangiospores. Investigation of the mechanism of antifungal action showed that EO and thymol interact with ergosterol. These data indicate that EO of T. vulgaris and thymol possess strong antifungal activity, which can be related to their interaction with ergosterol, supporting the possible use of these products in the treatment of mucormycosis.
This study confirms that geraniol and citronellol can be regarded as potential drugs for controlling T. rubrum growth, with great potential against agents of dermatophytosis.
RESUMO:O objetivo deste estudo foi investigar a interferência dos óleos essenciais de Lippia sidoides Cham, Plectranthus amboinicus Lour Spr., Conyza bonariensis L. e Eucalyptus citriodora Hook sobre o efeito de antibióticos utilizados na clínica. Os ensaios foram realizados com ampicilina (10 μg/mL), cefalotina (30 μg/mL), cloranfenicol (30 μg/mL), gentamicina (10 μg/mL) e tetraciclina (30 μg/mL) isolados e em associação com os óleos essenciais (4% v/v) através do método de difusão em meio sólido utilizando discos de papel de fi ltro. Os resultados mostraram interferência de alguns óleos essenciais sobre a atividade dos antibióticos ensaiados. Observou-se o desenvolvimento de halos de inibição do crescimento bacteriano com diferentes diâmetros quando da aplicação de antibióticos isolados e em combinação com os óleos essenciais. A ocorrência de comportamento sinérgico ou antagônico foi observada mais proeminentemente nas interações com cepas de S. aureus e S. epidermidis. De outra forma, observou-se uma menor interferência dos óleos essenciais no efeito dos antibióticos sobre as cepas Gram negativas, principalmente P. aeruginosa. Estes resultados mostram que o uso de produtos derivados de plantas pode em algumas situações interferir sobre a efetividade de antibióticos de uso no tratamento clínico.Unitermos: Plantas medicinais, óleos essenciais, antibióticos, uso associado, interferência.ABSTRACT: "Study of the interference of essential oils on the activity of some antibiotic used clinically". The aim of this study was to evaluate the interference of essential oils from Lippia sidoides Cham, Plectranthus amboinicus Lour Spr., Conyza bonariensis L. and Eucalyptus citriodora Hook on the antibacterial effect of clinically used antibiotics. The assays were carried out with ampicillin (10 μg/mL), cephalotin (30 μg/mL), chloraphenicol (30 μg/mL), gentamicin (10 μg/mL) and tetracyclin (30 μg/mL) isolated and associated with essential oils (4% v/v) by the solid medium diffusion procedure using fi lter paper discs. The results showed interference of some essential oils on the antibacterial activity of the assayed antibiotics. It was observed the development of growth inhibition halo with different diameters when the antibiotics were applied alone and associated with essential oils. Synergic or antagonic behavior was more prominent in interactions with S. aureus and S. epidermidis strains. On the other hand, it was observed a smaller interference of essential oils on the effect of the antibiotics against Gram negative strains, mainly P. aeruginosa. These results show that the use of plants by-products could some times interfere on the effectiveness of antibiotics used clinically.
Keywords:Medicinal plants, essential oils, antibiotics, associated use, interference.
INTRODUÇÃOAs plantas com propriedades terapêuticas utilizadas no cuidado de saúde tradicional constituem uma importante fonte de novos compostos biologicamente ativos. Elas aparecem como parte do cuidado tradicional de saúde em muitas partes do mundo ao longo de ...
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