Browsing by Author "Costa, E.M."
Now showing 1 - 2 of 2
Results Per Page
Sort Options
- Evaluation and insights into chitosan antimicrobial activity against anaerobic oral pathogensPublication . Costa, E.M.; Silva, S.; Pina, C.; Tavaria, F.K.; Pintado, M.M.The objective of this study was to assess the antimicrobial capability of non-chemically altered chitosan as an alternative to traditional antimicrobials used in the treatment of oral infections. The action mechanism of chitosan was also ascertained. High and low molecular weight chitosan showed antimicrobial activity at low concentrations for all tested bacteria with the MICs varying between 1 and 7 mg/ ml with a drop of efficacy relatively to the action of LMW chitosan. In addition chitosan showed also to be an effective bactericidal presenting bactericidal effect within 8 h at the latest. Additionally the evaluation of chitosan’s action mechanism showed that both MWs acted upon the bacterial cell wall and were not capable of interacting with the intracellular substances, as showed by the inefficacy obtained in the flocculation assay
- Evaluation of the antimicrobial activity of aqueous extracts from dry Vaccinium corumbosum extracts upon food microorganismsPublication . Silva, Sara; Costa, E.M.; Pereira, M.F.; Costa, M.R.; Pintado, M. E.As blueberries are rich in phenolic compounds, which possess a demonstrated antimicrobial activity, it may be interesting to further elucidate its real potential and properties. As such, the main goal of this work was to evaluate the potential antimicrobial activity of Vaccinium corymbosum dry fruits and leaves aqueous extracts against several contaminants/pathogenic microorganisms while at the same time assessing the effect of V. corymbosum over lactic acid bacteria.