Antioxidant activity and composition of propolis obtained by different methods of extraction

Journal of the Brazilian Chemical Society

Eberlin, Marcos N¹  Franco, Selma L¹  State University of Maringá, Maringá, Brazil¹  Visentainer, Jesuí V¹  Zeoula, Lucia M¹  Cottica, Solange M¹  Sawaya, Alexandra C. H. F¹  University of Campinas, Campinas, Brazil¹ 

关键词: total phenolic contents;    antioxidant activity;    ESI(-)-MS fingerprint;    propolis extraction;    flavonoids;   

DOI  :  10.1590/S0103-50532011000500016

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

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·) scavenging and by ferric reducing ability power (FRAP), using the ferric-tripyridyl triazine (Fe3+-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.

【 授权许可】

Unknown