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The present study aimed to determine the effect of season and altitude to amount and prevalence of phenolic compounds in propolis. For the aim, 174 propolis samples were collected from 58 stationary apiaries from altitudes of 0–200 m, 200–500 m and above 500 m in spring, summer, and autumn distributed in the Marmara region of Turkey. Ethanol-extracted propolis samples were analyzed by LC–MS/MS to...
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