NDLI: Phenols and antioxidant activity of hydro-alcoholic extracts of propolis from Algarve, South of Portugal.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Miguel, Maria Graça Nunes, Susana Dandlen, Susana Anahi Cavaco, Ana Margarida Antunes, Maria Dulce
Spatial Coverage	Portugal
Description	Country affiliation: Portugal Author Affiliation: Miguel MG ( Universidade do Algarve, Faculdade de Ciências e Tecnologia, DQF, Edifício 8, Centro de Biotecnologia Vegetal, Faro, Portugal. mgmiguel@ualg.pt)
Abstract	Propolis is a natural honeybee product known to be beneficial for human health, with a complex chemical composition, highly dependent on the collection site. The objective of the present research was to evaluate phenols and antioxidant activity of propolis samples collected in three main areas of Algarve, South of Portugal. Water revealed to be less effective for extracting phenolic compounds from propolis than the methanol and water/ethanol. The last two were good extraction solvents of phenols. Nevertheless water/ethanol was the solvent chosen because it was able to extract phenols in considerable amounts being less toxic than methanol. In spring, higher amounts of phenols (total phenols, flavones, flavonols, flavanones and dihydroflavonols) were detected in hydro-alcoholic extracts of propolis than in winter. Among the three main areas of Algarve where samples were collected, those from Barrocal had the highest levels of polyphenols, independent on the season (winter or spring). Within each area, the levels of phenols changed according to the zone. Concerning antioxidant activity, samples from Barrocal presented better radical scavenging abilities than those from the remaining areas, independent on the antioxidant method and collection season. Such results correlated closely with the levels of total phenols, flavones and flavonols in samples.
File Format	HTM / HTML
ISSN	02786915
Issue Number	12
Volume Number	48
e-ISSN	18736351
Journal	Food and Chemical Toxicology
Language	English
Publisher	Elsevier
Publisher Date	2010-12-01
Publisher Place	Great Britain (UK)
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Toxicology__semicolon__nutritional Discipline Sciences Antioxidants Analysis Phenols Propolis Chemistry Benzothiazoles Biphenyl Compounds Chelating Agents Ethanol Flavonoids Flavonols Free Radical Scavengers Pharmacology Metals Methanol Oxidants Picrates Portugal Solvents Sulfonic Acids Superoxides Water Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Medicine Toxicology Food Science

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