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DPPH free radical scavenging activity of the prepared propolis extracts from: (a) Podlasie (P1); (b) Masovia (P2); (c) West Pomerania Province (P3); EEP— ethanol extract of propolis, EHEP—ethanol-hexane extracts of propolis, HEP—hexane extract of propolis, HEEP—hexane-ethanol extracts of propolis.
