Atividade antibacteriana e interferência de Lantana camara L. e Lantana montevidensis (Spreng.) Briq. na resistência de aminoglicosídeos

In this work we report the antibacterial activity and interference of Lantana camara L. and L. montevidensis Briq. in activity of antibiotics classes of aminoglycosides. The extracts of leaves and roots of L. camara (EFLc and ERLc) and L. montevidensis (EFLm and ERLm) were assessed for antibacterial activity alone and in combination with aminoglycosides, by microdilution test. Standard and multi-resistant bacteria were used. The extracts showed an inhibitory activity for Gram-positive and Gram-negative analyzed. The most effective activity was demonstrated by the EFLm against Pseudomonas aeruginosa (MIC 8 µg/mL), and Escherichia coli (MIC 16 µg/mL). Synergistic effects were observed in the interaction of the extracts with the aminoglycosides, with a reduction of MICs. A synergistic effect was observed by ERLm interaction with amikacin in P. vulgaris, with reduction of MIC (625-20 µg/mL). These data are promising and indicate that extracts of L. camara and L. montevidensis can be an alternative source of natural products with antibacterial activity and potential to modulate resistance to aminoglycosides.O presente trabalho relata a atividade antibacteriana e a interferência de Lantana camara L. e Lantana montevidensis (Spreng.) Briq. na atividade de antibióticos da classes dos aminoglicosídeos. Os extratos das folhas e raízes de L. camara (EFLc e ERLc) e L. montevidensis (EFLm e ERLm) foram avaliados com relação a atividade antibacteriana isoladamente e em associação com antibióticos aminoglicosídeos, pelo teste de microdiluição. Bactérias padrão e multirresistentes foram utilizadas. Os extratos apresentaram atividade inibitória para as bactérias Gram-positivas e Gram-negativas analisadas. A atividade mais efetiva foi demonstrada pelo o EFLm frente a Pseudomonas aeruginosa (CIM 8 μg/mL), e Escherichia coli (CIM 16 μg/mL). Efeitos sinérgicos foram verificados na interação dos extratos com os aminoglicosídeos, com redução das CIMs. O efeito sinérgico mais representativo foi observado pelo ERLm na associação com a amicacina frente a P. vulgaris, com redução da CIM de 625 para 20 µg/mL. Esses dados são promissores e indicam que extratos de L. camara e L. montevidensis podem ser uma fonte alternativa de produto natural com atividade antibacteriana e potencial de modular a resistência de aminoglicosídeos

UPLC-MS-QTOF analysis and antifungal activity of Cumaru (Amburana cearensis).

This study was aimed at investigating the phytochemical constituents, antifungal properties and antibiotic-modifying activity of the aqueous crude extract and fractions of Amburana cearensis seeds (CEFAC). The CEFAC were chemically characterized by LC–MS/MS–QTOF. In addition, the antifungal activity was assayed by the microdilution method against strains of Candida albicans. The phytochemical profile of CEFAC exhibited phenolic compounds, organic acids, and polyphenols. The results of the assessment of antifungal activity reveled an IC(50) ranging from 45.6 to 2048 µg/mL. Interestingly, when CEFAC was associated with Fluconazole, we evidenced a decreased IC(50) (1.81–11.9 µg/mL), suggesting a synergism with antibiotic. It was possible to identify in the crude extract and fractions several phenolic compounds, organic acids, and some polyphenols in positive ionization mode. These results suggest that CEFAC may present compounds with the ability to interact and act synergistically with antimicrobial drugs, highlighting its potential as an alternative source for the development of new antimicrobial agents

Atividade antibacteriana e interferência de Lantana camara L. e Lantana montevidensis (Spreng.) Briq. na resistência de aminoglicosídeos

In this work we report the antibacterial activity and interference of Lantana camara L. and L. montevidensis Briq. in activity of antibiotics classes of aminoglycosides. The extracts of leaves and roots of L. camara (EFLc and ERLc) and L. montevidensis (EFLm and ERLm) were assessed for antibacterial activity alone and in combination with aminoglycosides, by microdilution test. Standard and multi-resistant bacteria were used. The extracts showed an inhibitory activity for Gram-positive and Gram-negative analyzed. The most effective activity was demonstrated by the EFLm against Pseudomonas aeruginosa (MIC 8 µg/mL), and Escherichia coli (MIC 16 µg/mL). Synergistic effects were observed in the interaction of the extracts with the aminoglycosides, with a reduction of MICs. A synergistic effect was observed by ERLm interaction with amikacin in P. vulgaris, with reduction of MIC (625-20 µg/mL). These data are promising and indicate that extracts of L. camara and L. montevidensis can be an alternative source of natural products with antibacterial activity and potential to modulate resistance to aminoglycosides.O presente trabalho relata a atividade antibacteriana e a interferência de Lantana camara L. e Lantana montevidensis (Spreng.) Briq. na atividade de antibióticos da classes dos aminoglicosídeos. Os extratos das folhas e raízes de L. camara (EFLc e ERLc) e L. montevidensis (EFLm e ERLm) foram avaliados com relação a atividade antibacteriana isoladamente e em associação com antibióticos aminoglicosídeos, pelo teste de microdiluição. Bactérias padrão e multirresistentes foram utilizadas. Os extratos apresentaram atividade inibitória para as bactérias Gram-positivas e Gram-negativas analisadas. A atividade mais efetiva foi demonstrada pelo o EFLm frente a Pseudomonas aeruginosa (CIM 8 μg/mL), e Escherichia coli (CIM 16 μg/mL). Efeitos sinérgicos foram verificados na interação dos extratos com os aminoglicosídeos, com redução das CIMs. O efeito sinérgico mais representativo foi observado pelo ERLm na associação com a amicacina frente a P. vulgaris, com redução da CIM de 625 para 20 µg/mL. Esses dados são promissores e indicam que extratos de L. camara e L. montevidensis podem ser uma fonte alternativa de produto natural com atividade antibacteriana e potencial de modular a resistência de aminoglicosídeos

<b>Abordagem fitoquímica, composição bromatológica e atividade antibacteriana de <em>Mimosa tenuiflora</em> (Wild) Poiret E <em>Piptadenia stipulacea</em> (Benth) Ducke</b> - doi: 10.4025/actascibiolsci.v33i1.5366

A necessidade de encontrar novas drogas eficazes no combate microbiano tem aumentado a cada dia e estimulado a busca de novos compostos naturais com atividades biológicas. Neste trabalho, realizaram-se estudo fitoquímico e análises microbiológicas com os extratos etanólicos das espécies (jurema-preta) Mimosa tenuiflora (Wild) Poiret e (jurema-branca) Piptadenia stipulacea (Benth) Ducke, frente a linhagens de bactérias patogênicas. O pó da casca do caule de ambas as espécies foi submetido à avaliação bromatológica e determinados os teores de Matéria Seca, Matéria Mineral, Proteína Bruta, Fibra em Detergente Neutro e Energia Bruta. Os resultados para a prospecção química indicaram a presença de taninos e outros compostos fenólicos, bem como a presença de saponinas em ambos os extratos. Os extratos das duas espécies demonstraram que mais de uma parte das plantas possui atividade antimicrobiana. A composição bromatológica da casca do caule de jurema-preta e jurema-branca apresentou teores diferenciados para as variáveis avaliadas

Chemical Composition of the Fixed Oil of Harconia speciosa and Modulation of the Antibiotic Activity against Non-Resistant and MDR Bacterial Strains

The species Hancornia speciosa (mangabeira) has varied potential. The bark has astringent properties, latex is used for tuberculosis, ulcers, herpes, dermatoses and warts, leaf tea is used for menstrual cramps and the root decoction to treat dislocations and hypertension. The aim of this work was to analyze the chemical composition of the fixed oil and antibacterial activities alone or in association with aminoglycosides against standard and MDR bacteria using broth microdilution assays. In the analysis of the oil by GC/MS, a high content of unsaturated fatty acids (73.46%) was identified in relation to saturated fatty acids (26.15%). Palmitic acid (22.49%) and elaidic acid (69.50%) were the main fatty acids identified. The antibacterial test results showed a more significant oil activity against Staphylococcus aureus SA&ndash;ATCC 6538 (MIC = 512 &mu;g/mL). For other strains including standards and multidrug resistant bacteria, the oil presented MIC &ge; 1024 &mu;g/mL. In association with antibiotics, the oil was able to improve antibacterial activity against bacterial strains. A synergic effect was observed for S. aureus SA&ndash;10, with MIC reduction of amikacin and gentamicin by 50.00 and 60.00%, respectively. The most significant association was found for Escherichia coli EC&ndash;06, with a reduction in MIC of 81.25%. The results indicate that seed oil of H. speciosa has the potential to act on bacterial resistance to aminoglycoside antibiotics

Modification of Antibiotic Activity by Fixed Oil of the Artocarpus heterophyllus Almond against Standard and Multidrug-Resistant Bacteria Strains

Artocarpus heterophyllus (jackfruit) is an evergreen tree distributed in tropical regions and is among the most studied species of the genus Artocarpus. The jackfruit almond has been highlighted in relation to phytochemical studies, biological properties, and application in the development of food products. This study aimed to analyze jackfruit fixed oil regarding chemical components, antibacterial property alone, and in association with antibiotics against standard and MDR bacteria strains. In the analysis of the oil by gas chromatography coupled to a flame ionization detector (GC-FID), a high content of saturated fatty acids (78.51%) was identified in relation to unsaturated fatty acids (17.07%). The main fatty acids identified were lauric acid (43.01%), myristic acid (11.10%), palmitic acid (6.95%), and oleic acid (15.32%). In the antibacterial analysis, broth microdilution assays were used. The oil presented minimum inhibitory concentration (MIC) &ge; 1024 &mu;g/mL in antibacterial analysis for standard and MDR bacterial strains. The oil showed synergistic effects in the association with gentamicin, ofloxacin, and penicillin against MDR strains, with significant reductions in the MIC of antibiotics. The results suggest that the fixed oil of A. heterophyllus has fatty acids with the potential to synergistically modify antibiotic activity

Chemical Composition of the Fixed Oil of <i>Harconia speciosa</i> and Modulation of the Antibiotic Activity against Non-Resistant and MDR Bacterial Strains

The species Hancornia speciosa (mangabeira) has varied potential. The bark has astringent properties, latex is used for tuberculosis, ulcers, herpes, dermatoses and warts, leaf tea is used for menstrual cramps and the root decoction to treat dislocations and hypertension. The aim of this work was to analyze the chemical composition of the fixed oil and antibacterial activities alone or in association with aminoglycosides against standard and MDR bacteria using broth microdilution assays. In the analysis of the oil by GC/MS, a high content of unsaturated fatty acids (73.46%) was identified in relation to saturated fatty acids (26.15%). Palmitic acid (22.49%) and elaidic acid (69.50%) were the main fatty acids identified. The antibacterial test results showed a more significant oil activity against Staphylococcus aureus SA–ATCC 6538 (MIC = 512 μg/mL). For other strains including standards and multidrug resistant bacteria, the oil presented MIC ≥ 1024 μg/mL. In association with antibiotics, the oil was able to improve antibacterial activity against bacterial strains. A synergic effect was observed for S. aureus SA–10, with MIC reduction of amikacin and gentamicin by 50.00 and 60.00%, respectively. The most significant association was found for Escherichia coli EC–06, with a reduction in MIC of 81.25%. The results indicate that seed oil of H. speciosa has the potential to act on bacterial resistance to aminoglycoside antibiotics

Antibiotic Activity Potentiation and Physicochemical Characterization of the Fixed Orbignya speciosa Almond Oil against MDR Staphylococcus aureus and Other Bacteria

Orbignya speciosa (babassu) is an important palm tree in Brazil whose fixed almond oil is used in popular medicine and especially in food, in addition to being a research target for the manufacture of biofuels. The aim of this study was to evaluate the fixed almond oil physicochemical characterization and its antibacterial activity in isolation and in association with aminoglycosides against standard and multidrug-resistant bacteria. Analyses such as water content, pH, acidity, peroxide index, relative density, and refractive index indicate the stability and chemical quality of the oil. In the oil&rsquo;s GC/MS chemical composition analysis, a high saturated fatty acid (76.90%) content was observed. Lauric acid (56.28%) and oleic acid (23.10%) were the major oil components. In the antibacterial test, a more significant oil activity was observed against K. pneumoniae KP-ATCC 10031 (minimal inhibitory concentration (MIC) = 406.37 &mu;g/mL) and Staphylococcus aureus ATCC 6538 (MIC = 812.75 &mu;g/mL), but for the other strains&mdash;including standard and multi-resistant strains&mdash;the oil presented an MIC &ge; 1024 &mu;g/mL. Furthermore, a synergistic effect was observed when the oil was associated with amikacin and gentamicin against S. aureus (SA-10) and an antagonistic effect was observed with amikacin against Escherichia coli. Data indicate the O. speciosa oil as a valuable nutritional source of lauric, oleic, and myristic fatty acids with an ability to modulate aminoglycoside activity