Data/hora: 09/06/2024 02:52:48

Provedor de dados: 	58	
País: 	Brazil	
Título: 	Analysis of the composition of Brazilian propolis extracts by chromatography and evaluation of their in vitro activity against gram-positive bacteria	
Autores: 	Sawaya,Alexandra C. H. F.; Souza,Kirllian S.; Marcucci,Maria C.; Cunha,Ildenize B.S.; Shimizu,Mario T.	
Data: 	2004-06-01	
Ano: 	2004	
Palavras-chave: 	Propolis; Thin layer chromatography; Bioauthography; High performance liquid chromatography; Extraction methods; Minimal bactericidal concentration.	
Resumo: 	Brazilian propolis from São Paulo state was submitted to extraction using several solvents, resulting in extracts with different composition. These extracts were submitted to Thin Layer Chromatography (TLC). Bioauthographic analysis of the TLC plates identified fractions with inhibitory activity, which were then analysed by High Performance Liquid Chromatography (HPLC). In vitro assays, commonly used to evaluate the activity of propolis against Gram-positive bacteria, were compared to determine which rendered the most consistent results. The bactericidal activity of these extracts were analysed by Serial Dilution in Tubes and Agar Plate Diffusion. Serial Dilution in Tubes obtained the most consistent results, with the Minimal Bactericidal Concentration of the extracts ranging between 2.5 and 20.0 mg/mL, for the species of Gram-positive bacteria tested. The results of the Agar Plate Diffusion were directly proportional to the hydro-solubility of the extracts and did not evaluate their bactericidal activity correctly. The bactericidal activity of this sample of propolis was due to the combined effect of several components that were identified by HPLC and were best extracted using 50% ethanol as a solvent.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822004000100017	
Editor: 	Sociedade Brasileira de Microbiologia	
Relação: 	10.1590/S1517-83822004000100017	
Formato: 	text/html	
Fonte: 	Brazilian Journal of Microbiology  v.35 n.1-2 2004	
Fonte: 	info:eu-repo/semantics/openAccess