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Comparison of Colorimetric Methods for the Determination of Flavonoid in Propolis Extract Products  

Kim, Eun-Jeong (Testing and Analysis Team, Gyeongin Regional Food and Drug Administration)
Lee, Hwa-Jung (Testing and Analysis Team, Gyeongin Regional Food and Drug Administration)
Kim, Hye-Jeong (Testing and Analysis Team, Gyeongin Regional Food and Drug Administration)
Nam, Hye-Seon (Testing and Analysis Team, Gyeongin Regional Food and Drug Administration)
Lee, Mi-Keong (Testing and Analysis Team, Gyeongin Regional Food and Drug Administration)
Kim, Hae-Young (Testing and Analysis Team, Gyeongin Regional Food and Drug Administration)
Lee, Jin-Ha (Testing and Analysis Team, Gyeongin Regional Food and Drug Administration)
Kang, Yun-Sook (Nutrition of Functional Food Headquarters, Korea Food and Drug Administration)
Lee, Jong-Ok (Food Headquarters, Korea Food and Drug Administration)
Kim, Hee-Yun (Testing and Analysis Team, Gyeongin Regional Food and Drug Administration)
Publication Information
Korean Journal of Food Science and Technology / v.37, no.6, 2005 , pp. 918-921 More about this Journal
Abstract
Quantitative analysis of flavonoids in commercial propolis extract products were compared by three colorimetric methods; aluminum chloride method, dinitrophenylhydrazine method and aluminum nitrate method, Aluminum nitrate method in Korea Health Supplement Food Code was proved to be specific only for flavones and flavonols same as aluminum chloride method, while dinitrophenylhydrazine method was specific for flavanones and dihydroflavonols. Therefore, the sum of flavonoid contents determined by 2,4-Dinitrophenylhydrazine method and aluminum nitrate method may represent the real content of total flavonoids. As for the 25 commercial propolis extract products examined, the contents of flavonoid varied from 2.15% to 9.53% except for one product.
Keywords
propolis; flavonoid; colorimetric method; aluminum nitrate; aluminum chloride; 2,4-dinitrophenylhydrazine;
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