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Characterization and quantitation of antioxidant constituents of sweet pepper (Capsicum annuum L.).
Hydxycinnamic derivatives, O-glycosides of quercetin, luteolin, and chrysoeriol, and a large number of C-glyCosyl flavones have been characterized and found for the first time in nature. Expand
Characterisation of polyphenols and antioxidant properties of five lettuce varieties and escarole.
The red varieties showed the highest antioxidant activity by all the methods assayed, and the highest total phenolic content was observed in red-leafed varieties while the highest level of vitamin C was detected in the continental variety. Expand
Phenolic profiles of Portuguese olive fruits (Olea europaea L.): Influences of cultivar and geographical origin
Abstract The phenolic compounds present in 29 samples of olive fruits were analysed by reversed-phase HPLC/DAD and/or HPLC-DAD/ESI-MS/MS. All samples were collected during the normal picking periodExpand
Characterization of C-glycosyl flavones O-glycosylated by liquid chromatography-tandem mass spectrometry.
The study of the relative abundance of the main ions from the MS preferential fragmentation on -MS2 and/or -MS3 events allows the differentiation of the position of the O-glycosylation, either on phenolic hydroxyl or on the sugar moiety of C-gly cosylation. Expand
HPLC flavonoid profiles as markers for the botanical origin of European unifloral honeys
The HPLC phenolic profiles of 52 selected unifloral honey samples produced in Europe were analysed to detect possible markers for the floral origin of the different honeys, and the characteristic propolis-derived flavonoids pinocembrin, pinobanksin and chrysin were present in most samples in variable amounts. Expand
Effect of processing and storage on the antioxidant ellagic acid derivatives and flavonoids of red raspberry (Rubus idaeus) jams.
From red raspberries, ellagic acid, its 4-arabinoside, its4' (4' '-acetyl) arabinosides, and its 4' ( 4' ' -acetyl)' arabinouside, as well as quercetin and kaempferol 3-glucosides were identified and all of the isolated compounds showed antioxidant activity. Expand
Phenolic compounds from Brazilian propolis with pharmacological activities.
Four compounds isolated from Brazilian propolis induced a relaxant effect similar to propolis extract against Trypanosoma cruzi and the bacteria Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus and Streptococcus faecalis. Expand
Approach to the study of C-glycosyl flavones by ion trap HPLC-PAD-ESI/MS/MS: application to seeds of quince (Cydonia oblonga).
Ion trap HPLC-PAD-ESI/MS/MS has been used to study C-glycosyl flavones in quince seeds and deductions were made about the nature of the sugar units and the positions of C- Glycosylation. Expand
Phytochemical and antioxidant characterization of Hypericum perforatum alcoholic extracts
Abstract The antioxidant potentials of a total ethanolic extract of Hypericum perforatum (TE) and fractions were evaluated and correlated with their phenolic contents. The extracts were fullyExpand
Flavonoids, phenolic acids and abscisic acid in Australian and New Zealand Leptospermum honeys
Results showed that flavonoids and phenolic acids could be used for authenticating honey floral origins, and abscisic acid may aid in this authentication. Expand