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Authors
Barros, Lillian
Carvalho, Ana Maria
Ferreira, Isabel C.F.R.
Advisor(s)
Abstract(s)
This study reports the first approach to the antioxidant potential evaluation of three Lamiaceae often
used in Portuguese folk medicine, The lipid peroxidation inhibition capacity of ground ivy, oregano
and mastic thyme was accessed by biochemical assays used as models for the lipid peroxidation
damage in biomembranes, n=ely inhibition of ~-carotene bleaching in the presence of linoleic acid
radicals and inhibition of thiobarbituric acid reactive substances (TBARS) formation in brain
homogenates, The antioxidant properties were also evaluated through the reducing power
determination and radical scavenging activity of 2,2-diphenyl-I-picrylllydrazyl (DPPH) radicals.
Bioactive compowlds such as phenolics, flavonoids and ascorbic acid were also determined.
Oregano proved to have the highest radical scavenging and lipid peroxidation inhibition capacity
(EC,. values lower than 0.45 mg/ml). This species also revealed the highest content in antioxidants
such as phenolics (368.58 ± 18.18 mg/g), flavonoids (224.15 ± 0.96 mg/g) and ascorbic acid
(1 70,69 ± 5,29 J.Ig/g), Significantly negative linear correlations were observed between the bioactive
compounds and antioxidant activity EC50 values of the three Lamiaceae.
Description
Keywords
Citation
Barros, Lillian; Carvalho, Ana Maria; Ferreira, Isabel C.F.R. (2009). Evaluation of the in vitro antioxidant activity of three Lamiaceae often used in Portuguese folk medicine. In Proceedings of EuroFoodChem VX, Food for the future- the contribution of chemistry to improvement of food quality. Food Safety and Technology (FST). p. 47-50. ISBN 978-87-993033-4-2