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Type: Artigo de periódico
Title: Antioxidant Activity and Composition of Propolis Obtained by Different Methods of Extraction
Author: Cottica, SM
Sawaya, ACHE
Eberlin, MN
Franco, SL
Zeoula, LM
Visentainer, JV
Abstract: Ethanolic extracts of propolis obtained with different concentrations of propolis and made using hydrous ethanol with various water/ethanol contents were analyzed. The antioxidant action of the extracts was determined by free radical 1,1-diphenyl-2-picryl-hydrazyl (DPPH center dot) scavenging and by ferric reducing ability power (FRAP), using the ferric-tripyridyl triazine (Fe(3+)-TPTZ) complex. The total phenolic and flavonoid contents were also determined, and the electrospray ionization mass spectrometry spectra (ESI(-)-MS) of the extracts were acquired. The chemical composition of propolis extracts and their antioxidant activity were observed to vary with the concentration of propolis, and especially with the water/ethanol contents of the hydrous ethanol used for extraction. The antioxidant activity of the extracts was also found to be significantly dependent on these extraction parameters, as well as on the composition of the phenolic compounds and flavonoids. FRAP values showed, however, poor correlation with the flavonoid content.
Subject: total phenolic contents
antioxidant activity
ESI(-)-MS fingerprint
propolis extraction
Country: Brasil
Editor: Soc Brasileira Quimica
Citation: Journal Of The Brazilian Chemical Society. Soc Brasileira Quimica, v. 22, n. 5, n. 929, n. 935, 2011.
Rights: aberto
Date Issue: 2011
Appears in Collections:Unicamp - Artigos e Outros Documentos

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