Bactericidal
Mostrando 25-36 de 3031 artigos, teses e dissertações.
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25. Evaluation of the antimicrobial and antioxidant activity of 7-hydroxy-4’, 6-dimethoxy-isoflavone and essential oil from Myroxylon peruiferum L.f
Abstract: This study evaluated the antibacterial, antifungal, and antioxidant effect of 7-hydroxy-4’,6-dimethoxy-isoflavone and essential oil of Myroxylon peruiferum. The compound was isolated and its structure elucidated by NMR. The chemical composition of essential oil determined by GC-MS analysis. To evaluation of antimicrobial activity, the Minimum Inh
An. Acad. Bras. Ciênc.. Publicado em: 25/04/2019
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26. Antioxidant and antibacterial activity and preliminary toxicity analysis of four varieties of avocado (Persea americana Mill.)
Resumo As atividades antioxidante e antibacteriana, e a toxicidade de produtos naturais podem mudar de acordo com a variedade vegetal, bem como a parte da planta que é analisada. Neste estudo, foram analisadas cascas, polpas e sementes de quatro variedades de abacate (Quintal, Fortuna, Margarida e Hass) no que tange às propriedades antioxidantes e antibac
Braz. J. Food Technol.. Publicado em: 01/04/2019
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27. Antimicrobial Potential of Natural and Semi-Synthetic ent-Kaurane and ent-Pimarane Diterpenes against Clinically Isolated Gram-Positive Multidrug-Resistant Bacteria
In this work, a search for antimicrobial agents against multi-drug resistant (MDR) bacteria was undertaken. It involved two natural diterpenes of different basic skeletons, named ent-kaurenoic acid and ent-pimaradienoic acid, that were used as precursors to access 28 semi-synthetic derivatives that were also submitted to biological assays. All 30 substances
J. Braz. Chem. Soc.. Publicado em: 2019-02
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28. Synthesis, Antimicrobial Activity and Structure-Activity Relationship of Some 5-Arylidene-thiazolidine-2,4-dione Derivatives
Derivatives of the thiazolidine-2,4-dione core represent a heterocyclic class with several correlated properties. In this context, the synthesis of structural analogues of these bioactive substances becomes attractive in the field of medicinal chemistry. These analogues act as antimicrobial agents against Gram-positives pathogens. The present work aimed to s
J. Braz. Chem. Soc.. Publicado em: 2019-01
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29. Ultrasound for improving the preservation of chicken meat
Abstract The objective of this study was to evaluate the effect of power ultrasound on the microbiota of chicken meat. Samples were treated under the following conditions of frequency and power: 20 kHz and 27.6 W/cm2; 40 kHz and 10.3 W/cm2; 850 kHz and 24.1 W/cm 2. Microbial counts were done before the ultrasound treatment, immediately after and following 7
Food Sci. Technol. Publicado em: 21/09/2018
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30. Phenolic content and antibacterial activity of extracts of Hamelia patens obtained by different extraction methods
Abstract Hamelia patens, is a plant traditionally used to treat a variety of conditions among the Huastec people of Mexico. The objective of this study is to characterize the phenolic content and critically examine the antimicrobial activity of leaf extracts H. patens, obtained by maceration, Soxhlet and percolation, using ethanol as 70% solvent. Phenolic co
Braz. J. Microbiol.. Publicado em: 2018-09
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31. Biological Synthesis of Selenium Nanoparticles and Evaluation of their Bioavailability
ABSTRACT Nanoparticles due to their unique properties have attracted more attention and their bacterial biosynthesis is more favorable because is environmental friendly and the size and yield of nanoparticles can be optimized. The aim of the present study was biosynthesis of Selenium nanoparticles using Bacillus cereus. For this purpose, bacterial culture wa
Braz. arch. biol. technol.. Publicado em: 14/06/2018
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32. Antibacterial and antibiofilm activity of carvacrol against Salmonella enterica serotype Typhimurium
ABSTRACT The present study evaluated the antibacterial and antibiofilm activity of carvacrol against Salmonella Typhimurium. The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) were determined and the time-kill curve and scanning electron microscopy (SEM) were performed to evaluate antibacterial activity. Antibiofilm activ
Braz. J. Pharm. Sci.. Publicado em: 07/06/2018
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33. Chemical characterization, antioxidant and antimicrobial activity of propolis obtained from Melipona quadrifasciata quadrifasciata and Tetragonisca angustula stingless bees
In this study, we investigated the chemical composition, and antioxidant and antibacterial properties of ethanolic extracts of propolis (EEP) from Melipona quadrifasciata quadrifasciata and Tetragonisca angustula. Chemical composition of EEP was determined by colorimetry and chromatographic (HPLC-DAD and UPLC-Q/TOF-MS/MS) analysis. Antimicrobial activity of
Braz J Med Biol Res. Publicado em: 21/05/2018
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34. Phytochemicals, antioxidant and antimicrobial potentials and LC-MS analysis of hydroalcoholic extracts of leaves and flowers of Erodium glaucophyllum collected from Tunisian Sahara
Abstract Erodium glaucophyllum collected from Tunisian Sahara was never presented in the relevant literature yet. In this study, the phytochemical profiles, chemical compositions, antioxidant and antimicrobial activities, and Kill-time assay of the hydroalcoholic extract of flowers and leaves were investigated. The highest content in phenols, flavonoids and
Food Sci. Technol. Publicado em: 16/04/2018
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35. A novel expression vector for the secretion of abaecin in Bacillus subtilis
ABSTRACT This study aimed to describe a Bacillus subtilis expression system based on genetically modified B. subtilis. Abaecin, an antimicrobial peptide obtained from Apis mellifera, can enhance the effect of pore-forming peptides from other species on the inhibition of bacterial growth. For the exogenous expression, the abaecin gene was fused with a tobacco
Braz. J. Microbiol.. Publicado em: 2017-12
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36. Tailored Silica Nanoparticles Surface to Increase Drug Load and Enhance Bactericidal Response
Nanoparticles' surface properties can be used as triggers to regulate or even enhance biological response and generate tailored structures to substitute conventional antibiotics. Here, silica nanoparticles surface was duly tuned in order to increase the water-insoluble drug load (curcumin) and improve the antibacterial activity. Our main motivation was based
J. Braz. Chem. Soc.. Publicado em: 2017-09