Monday, March 28, 2011

Propolis Ethanol Extract Shows Stronger Antioxidant Activity

Antioxidant Activity and Total Phenolics of Propolis from the Basque Country (Northeastern Spain)
Journal of the American Oil Chemists' Society, Online First

The purpose of this study was to evaluate the antioxidant activity (AA) of 19 propolis extracts prepared in different solvent (ethanol and propylene glycol).

It was observed that all the samples tested had AA, although results varied considerably between extracts, i.e. 420–1,430 μmol Trolox/g (ABTS), 108–291 mg ascorbic acid/g (DPPH), and 1,573–4,669 μmol iron++ sulfate/g (FRAP).

The ethanol may enhance the potency of the AA, and the correlation coefficient between total phenolic content (TPC) (200–340 mg/g propolis extracts) and AA was statistically significant. Total flavonoids ranged from 72 to 161 mg/g propolis extracts.

The results indicate that TPC and flavonoids contributed to AA.

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