FOOD SCIENCE ›› 2012, Vol. 33 ›› Issue (18): 143-148.

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Composition Analysis in Ethanol Extracts of Propolis Samples from Northern China

  

  • Received:2012-04-17 Revised:2012-07-31 Online:2012-09-25 Published:2012-09-07

Abstract: The purpose of this study was to compare the contents of total phenols, total flavonoids and individual components in ethanol extracts of propolis samples collected from Northern China (Beijing and 10 provinces). The content of total flavonoids and total phenols were determined by NaNO2-Al(NO3)3 method and Folin-Ciocalteau method, respectively. Quantitative and qualitative HPLC analysis of phenols in propolis extracts was carried out by comparison with standard references for geographic cluster analysis of propolis samples. The results showed that the contents of total flavonoids and total phenols of propolis samples varied with geographic origin. The highest contents of caffeic acid, kaempferol, pinocembrin, chrysin, galangin and benzyl cinnamate were found in propolis samples from Henan province; propolis samples from Liaoning province were the richest in apigenin and isorhamnetin; propolis samples from Shandong province showed the highest content of rhamnetin.

Key words: propolis extract, HPLC, composition analysis

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