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| Registros recuperados: 81 | |
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| Cogo,Laura Lúcia; Monteiro,Cristina Leise Bastos; Miguel,Marilis Dallarmi; Miguel,Obdulio Gomes; Cunico,Miriam Machado; Ribeiro,Marcelo Lima; Camargo,Eloá Ramalho de; Kussen,Gislene Maria Botão; Nogueira,Keite da Silva; Costa,Libera Maria Dalla. |
| The antibacterial activity of plant extracts obtained from Bixa orellana L., Chamomilla recutita L., Ilex paraguariensis A. St.-Hil., Malva sylvestris L., Plantago major L. and Rheum rhaponticum L. has been evaluated against two reference strains and eleven clinical isolates of Helicobacter pylori. All the plant species chosen are used in popular Brazilian cuisine and folk medicine in the treatment of gastrointestinal disorders. Initial screening was made by the disk diffusion test and then minimum inhibitory concentration was determined by the agar dilution method. The results presented in this work demonstrated that among the plant preparations analyzed, B. orellana L., C. recutita L., I. paraguariensis A. St.-Hil. and M. sylvestris L. were capable of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Helicobacter pylori; Antibacterial activity; Plant extracts. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822010000200007 |
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| Dharne,M.S.; Gupta,A.K.; Rangrez,A.Y.; Ghate,H.V.; Patole,M.S.; Shouche,Y.S.. |
| Flesh flies (Diptera: Sarcophagidae) are well known cause of myiasis and their gut bacteria have never been studied for antimicrobial activity against bacteria. Antimicrobial studies of Myroides spp. are restricted to nosocomial strains. A Gram-negative bacterium, Myroides sp., was isolated from the gut of adult flesh flies (Sarcophaga sp.) and submitted to evaluation of nutritional parameters using Biolog GN, 16S rRNA gene sequencing, susceptibility to various antimicrobials by disc diffusion method and detection of metallo β-lactamase genes (TUS/MUS). The antagonistic effects were tested on Gram-negative and Gram-positive bacteria isolated from human clinical specimens, environmental samples and insect mid gut. Bacterial species included were Aeromonas... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Flesh fly; Myroides sp.; 16S rRNA; Antibacterial activity; Metallo beta-lactamase. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822008000200035 |
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| Lima-Filho,José Vitor M.; Carvalho,Ana F.F.U.; Freitas,Sissi M.; Melo,Vânia M.M.. |
| Hexane, chloroform and ethanol extracts of six marine macroalgae (Rhodophyta and Chlorophyta) from North Ceará coast (Northeast Brazil) were evaluated for antibacterial activity by the single disk method. Best results were shown by the hexane extracts of Amansia multifida against enteric Gram-negative strains such as Enterobacter aerogenes, Klebsiella pneumoniae, Pseudomonas aeruginosa, Salmonella typhi, S. cholerae-suis, Serratia marcescens, Vibrio cholerae and the Gram-positive bacteria Bacillus subtilis and Staphylococcus aureus. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antibacterial activity; Algae; Lipid-soluble extracts. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822002000400006 |
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| Castilho,Adriana Lígia de; Silva,Juliana Paola Correa da; Saraceni,Cintia Helena Coury; Díaz,Ingrit Elida Collantes; Paciencia,Mateus Luís Barradas; Varella,Antonio Drauzio; Suffredini,Ivana Barbosa. |
| Previous studies analyzing 2,200 plant extracts indicated anti-enterococcal activity in 25 extracts obtained from Brazilian forests' plants. In the present study, these extracts were subjected to microdilution broth assay (MDBA) and disk diffusion assay (DDA) using planktonic Enterococcus faecalis ATCC® 29212TM and were submitted to phytochemical analysis in TLC and HPLC. Three extracts obtained from Ipomoea alba (MIC < 40 µg/mL), Diclinanona calycina (MIC < 40 µg/mL) and Moronobea coccinea (40 < MIC < 80 µg/mL; MBC = 80 µg/mL) showed significant bactericidal activity in the MDBA and four extracts obtained from I. alba (14.04 ± 0.55 mm diameter) S. globulifera (14.43 ± 0.33 mm and 12.18 ± 0.28 mm diameter) and Connarus ruber var. ruber (13.13 ±... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Enterococcus faecalis; Endodontitis; Antibacterial activity; Amazon rain forest; Bioprospection. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822014000300002 |
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| Nuñez,L.; D' Aquino,M.. |
| Clove essential oil, used as an antiseptic in oral infections, inhibits Gram-negative and Gram-positive bacteria as well as yeast. The influence of clove essential oil concentration, temperature and organic matter, in the antimicrobial activity of clove essential oil, was studied in this paper, through the determination of bacterial death kinetics. Escherichia coli, Staphylococcus aureus and Pseudomonas aeruginosa were the microorganisms selected for a biological test. To determine the temperature effect, they were assayed at 21° and 37° C. The concentration coefficient was determined with 0.4%, and 0.2% of essential oil. The influence of the presence of organic matter was determined with 0.4% of essential oil. The results obtained demonstrated that... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Clove essential oil; Concentration coefficient; Organic matter; Antibacterial activity. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822012000400003 |
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| Gomes,Alcir Teixeira; Smania Júnior,Artur; Seidel,Cintia; Smania,Elza de Fátima Albino; Honda,Neli Kika; Roese,Fernanda Mesquita; Muzzi,Rozanna Marques. |
| In order to obtain new compounds with antibacterial activity, the derivatives 2,4-dihydroxy-6-methylbenzoic acid (orsellinic acid) and 2,4-dihydroxy-6-methylbenzoates (orsellinates) were obtained through alcoholyses of lecanoric acid. All these substances were tested against Gram-positive and Gram-negative bacteria by a microdilution method. Staphylococcus aureus, Xanthomonas campestris var. vesicatoria and Ralstonia solanacearum were most sensitive to n-propyl 2,4-dihydroxy-6-methylbenzoate, n-pentyl 2,4-dihydroxy-6-methylbenzoate and n-hexyl 2,4-dihydroxy-6-methylbenzoate with MIC (Minimal Inhibitory Concentration) values ranging from 62.5 to 7.8 µg×mL¹. These results showed that homologation in carbon chain may lead to compounds with more pronunced... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Orsellinates; Lecanoric acid; Orsellinic acid; Antibacterial activity. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822003000300002 |
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| Trevisan,Daliah Alves Coelho; Silva,Alex Fiori da; Negri,Melyssa; Abreu Filho,Benício Alves de; Machinski Junior,Miguel; Patussi,Eliana Valéria; Campanerut-Sá,Paula Aline Zanetti; Mikcha,Jane Martha Graton. |
| 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 activity was evaluated by quantifying total biomass using crystal violet assay, and metabolic activity was determined using MTT [3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide] assay. The action of carvacrol against preformed biofilm on polypropylene and stainless steel was also evaluated by colony counting and SEM. The MIC and MBC was 312 µg mL-1. Carvacrol at MIC and 2 x MIC eliminated cells... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Carvacrol; Biofilm; Antibacterial activity; Salmonella Typhimurium.. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502018000100612 |
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| Jin,Qing-Hao; Fu,Zhi-Yang; Xia,Ya-Nan; Liu,Bing-Yu; Jiang,Hai-Ying. |
| In the present study, a series of novel 5,7-diisoprenyloxyflavone derivatives were designed, synthesized, and evaluated for their antibacterial activity. Most of these compounds displayed significant antibacterial effects against Gram-positive bacteria, especially against strains of multidrug-resistant clinical isolates. Compounds 4c, 4g, 4i, 4j, 4k, 4l, 4n, 4q and 4t showed high levels of antimicrobial activity against Staphylococcus aureus RN4220 with minimum inhibitory concentrations of 4.0-20 µM. Compound 4k showed the most potent activity among these compounds against all multidrug-resistant clinical isolates tested. Unfortunately, none of the compounds were active against Gram-negative bacteria at the doses of 24-164 µM. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Flavonoids; Synthesis; Isoprenyloxyflavones; Antibacterial activity. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502020000100541 |
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| Amparo,Tatiane Roquete; Rodrigues,Ivanildes Vasconcelos; Seibert,Janaína Brandão; Almeida,Tamires Cunha; Cabral,Vivette Appolinário Rodrigues; Vieira,Paula Melo de Abreu; Brandão,Geraldo Célio; Oliveira,Mauro Lúcio Gonçalves de; Silva,Glenda Nicioli da; Santos,Orlando David Henrique dos; Vieira Filho,Sidney Augusto; Teixeira,Luiz Fernando Medeiros; Souza,Gustavo Henrique Bianco de. |
| Due to the increase of bacterial resistance, the search for new antibiotics is necessary and the medicinal plants represent its most important source. The aim of this study was to evaluate the antibacterial property of extract and fractions from Protium spruceanum leaves, against pathogenic bacteria. By means of diffusion and microdilution assays, the crude extract was active against the nine bacteria tested being the hydromethanolic fraction the most active. During phytochemical procedures, procyanidin (1) and catechin (2) were identified as the main antibacterial constituents of this fraction. In silico results obtained using PASSonline tool indicated 1 and 2 as having good potential to interact with different targets of currently used antibiotics. These... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Protium spruceanum; Burseraceae; Procyanidin; Catechin; Antibacterial activity. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502020000100623 |
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| Nunes,Melise Silveira; Garzon,Litiérri Razia; Rampelotto,Roberta Filipini; Tizotti,Maísa Kräulich; Martini,Rosiéli; Locatelli,Aline; Barbosa,Marcelo; Hörner,Manfredo; Hörner,Rosmari. |
| ABSTRACT The enhancement of anti-leukemia therapy and the treatment of infections caused by multidrug-resistant pathogens are major challenges in healthcare. Although a large arsenal of drugs is available, many of these become ineffective, and as a result, the discovery of new active substances occurs. Notably, triazenes (TZCs) have been consolidated as a promising class of compounds, characterized by significant biological activity, especially antiproliferative and antimicrobial properties. The aim of this study is the synthesis and characterization of a new triazenide complex of gold (I), as well as the in vitro assessment of its antiproliferative activity against the K562 cell line (Chronic Myeloid Leukemia), and antibacterial activity against bacterial... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Triazenes/synthesis/characterization/biological activity; TZC/Gold ion complexed; Chronic myeloid leukemia; Antibacterial activity. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502017000400617 |
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| Saavedra,Nicolás; Barrientos,Leticia; Herrera,Christian L; Alvear,Marysol; Montenegro,Gloria; Salazar,Luis A. |
| Dental caries is an infectious disease of worldwide public health concern. Among the bacteria involved in this pathology are Streptococcus mutans, Streptococcus sobrinus and organisms belonging to the genera Actinomyces and Lactobacillus. The pharmaceutical industry is focussing on the discovery of new antibacterial products after a greater resistance to those already known. Propolis has been used since ancient times, so their effects against various microorganisms have been already investigated. In our study, we evaluated the antimicrobial effect of 6 commercial ethanolic propolis extracts on the bacterium Lactobacillus fermentum. This bacterium was isolated after its identification by Polymerase Chain Reaction using species specific primers, and after... |
| Tipo: Journal article |
Palavras-chave: Lactobacillus fermentum; Dental caries; Propolis; Antibacterial activity. |
| Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202011000100011 |
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| Voss-Rech,Daiane; Klein,Cátia Silene; Techio,Vânia Helena; Scheuermann,Gerson Neudi; Rech,Gilberto; Fiorentin,Laurimar. |
| in vitro antibacterial activity of 21 hydroethanolic vegetal extracts was assessed against 20 serovars of Salmonella. Regarding the tested extracts, 85.7% of them presented antibacterial activity. The six active extracts which showed activity on the largest number of serovars and the extract of Eucalyptus sp. were submitted to the determination of Minimum Inhibitory Concentration (MIC) and Minimum Bactericidal Concentration (MBC). Of these, six extracts showed bacteriostatic and bactericidal activity with MIC and MBC for Punica granatum (pomegranate) from 20 and 60mg mL-1, for Eugenia jambolana (rose apple) from 40 and 240mg mL-1, Eugenia uniflora (surinam cherry) from 80 and 240mg mL-1, Caryophyllus aromaticus (clove) from 10 and 60mg mL-1, Psidium araca... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antibacterial activity; Vegetal extracts; Salmonella. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782011000200022 |
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| Rosa,Jessica Miranda; Bonato,Letícia Bicudo; Mancuso,Carolina Bragine; Martinelli,Laira; Okura,Mônica Hitomi; Malpass,Geoffroy Roger Pointer; Granato,Ana Claudia. |
| ABSTRACT: Medicated wound dressings are important barriers to avoid contamination and, when they contain antimicrobial additives, can be used as treatment for infected wounds. There are several types of polysaccharide materials that serve as matrices for medicated wound dressings, among them, sodium alginate. For the preparation of the films studied in this paper, sodium alginate was employed in combination with essential oils/oleoresins (EO/OL) of six peppers that are commonly used in cooking. The EO/OL were incorporated at three different concentrations (low, intermediate and high). Most of the films prepared had better dispersion of the EO/OL at the intermediate concentration. All films studied in this research were dissolved in water at different... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Medicated wound dressings; Alginate-based films; Essential oils; Oleoresins; Antibacterial activity. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018000300453 |
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| Costa,Milena da Cruz; Cruz,Alexsandra Iarlen Cabral; Bispo,Aline Simões da Rocha; Ferreira,Mariza Alves; Costa,João Albany; Evangelista-Barreto,Norma Suely. |
| ABSTRACT: This study aimed to evaluate the microbiological quality and the transmission of multidrug-resistant bacteria in different spices sold in town fairs (local food markets) in the municipalities of Recôncavo Baiano. Samples of black pepper, oregano, and cinnamon were collected over a period of six months and investigated for coliforms at 45 °C, Staphylococcus spp., Staphylococcus aureus, Bacillus spp., Bacillus cereus, Escherichia coli and Salmonella spp. The contamination in the black pepper samples (log 4.66 CFU g-1) was higher (P>0.05), than those of cinnamon (log 2.55 CFU g-1) and oregano (log 2.49 CFU g-1), particularly for B. cereus. E. coli (89%) and Salmonella spp. (67%) were isolated only from black pepper. B. cereus and S. aureus showed... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Spice plants; Antibacterial activity; Multiresistance. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782020000400455 |
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| Silveira,Sheila Mello da; Cunha Júnior,Anildo; Scheuermann,Gerson Neudí; Secchi,Fábio Luiz; Vieira,Cleide Rosana Werneck. |
| The chemical composition of 10 selected plant essential oils obtained by steam distillation was determined by GC and GC/MS. The antimicrobial activity of the essential oils was screened against 12 important food-related bacterial strains by agar disc-diffusion assay. MIC and MBC were determined for the essential oils that presented the highest activity in the agar disc-diffusion test. The most active essential oils against the tested bacteria were, in descending order, lemongrass (Cymbopogon flexuosus), basil (Ocimum basilicum), oregano (Origanum vulgare), cinnamon leaf (Cinnamomum zeylanicum), and laurel (Laurus nobilis). Except for S. Typhimurium, the tested bateria were inhibited at MIC values lower or equal to 0.62mg mL-1 by lemongrass (Cymbopogon... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Essential oils; Chemical composition; Phytotherapic agents; Antibacterial activity; Food pathogens. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782012000700026 |
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| Bandeira Junior,Guerino; Souza,Carine de Freitas; Baldissera,Matheus Dellaméa; Descovi,Sharine Nunes; Silveira,Bibiana Petri da; Tasca,Caiane; Mourão,Rosa Helena Veras; Vargas,Agueda Palmira Castagna de; Baldisserotto,Bernardo. |
| ABSTRACT: The use of natural products, such as essential oils (EOs), is a potential novel approach to treat fish bacterial infections with a lower risk of developing resistance. There has been a number of studies reporting the activity of EOs as those obtained from the species Achyrocline satureioides, Aniba parviflora, Aniba rosaeodora, Anthemis nobilis, Conobea scoparioides, Cupressus sempervirens, Illicium verum, Lippia origanoides, and Melaleuca alternifolia against bacteria. However, there are few studies investigating the effect of these EOs against fish bacteria. Therefore, the aim of this study was to evaluate the in vitro antibacterial activity of EOs against the following fish bacteria, Aeromonas hydrophila, Citrobacter freundii, and Raoultella... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aeromonas hydrophila; Antibacterial activity; Silver catfish; Longevity; Therapeutic success. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019000600451 |
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| Registros recuperados: 81 | |
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