3 resultados para Radical scavenging activity
em SAPIENTIA - Universidade do Algarve - Portugal
Resumo:
In order to produce packaging films with a broad spectrum of action on microorganisms, the
effect of two antimicrobial (AM) to be included in the films, carvacrol and GSE were studied
separately on different microorganisms. Carvacrol was more effective against the grampositive
bacteria than against the gram-negative bacterium. GSE was not effective against
yeast. Subsequently, a search for optimal combinations of carvacrol, GSE and the addition of
chitosan (as a third component with film forming properties) was carried out. Response
surface analysis showed several synergetic effects and three optimal AM combinations
(OAMC) were obtained for each microorganism. The experimental validation confirmed that
the optimal solutions found can successfully predict the response for each microorganism.
The optimization of mixtures of the three components, but this time, using the same
concentration for all microorganisms, was also studied to obtain an OAMC with wide spectrum
of activity. The results of the response surface analysis showed several synergistic effects for
all microorganisms. Three OAMC, OAMC-1, OAMC-2, OAMC-3, were found to be the optimal
mixtures for all microorganisms. The radical scavenging activity (RSA) of the different agents
was then compared with a standard antioxidant (AOX) BHT, at different concentrations; as also
at the OAMC. The RSA increased in the following order: chitosan
Resumo:
Essential oils are used in Cosmetic, Perfumery, Food and Pharmaceutical Industries as flavours and/or medicines. However, part of the essential oil components that remains in the distillation water (hydrosol or distillate water) has been less studied both in chemical and biological terms. This research concerns the antioxidant activity, measured through several methods, of Lavandula officinalis L., Origanum majorana L., Rosmarinus officinalis L., Salvia officinalis L. and Thymus vulgaris L., Cinnamomum verum J. Presl. and Syzygium aromaticum (L.) Merrill and Perry hydrosols. The ability of hydrosols to prevent oxidation was checked by two main methods: prevention of lipid peroxidation through the measurement of malonaldehyde produced after degradation of hydroperoxides; and ability for scavenging free radicals including hydroxyl and superoxide anion radicals. The S. aromaticum and T. vulgaris hydrosols, predominantly constituted by eugenol and carvacrol, respectively, were the most effective as antioxidants, except for scavenging superoxide anion radical. In this case, L. officinalis hydrosol in which linalool prevailed was a stronger antioxidant. The worst hydrosol as antioxidant was that of S. officinalis, independent on the method checked.
Resumo:
Tese de doutoramento, Ciências Biotecnológicas (Biotecnologia Alimentar), Faculdade de Ciências e Tecnologia, Universidade do Algarve, 2014