Plant Diversity ›› 2008, Vol. 30 ›› Issue (01): 125-128.

• Articles •

### Quantification of Flavonoid Compounds from Strawberry ( Fragaria ananassa) and Correlation Effects with Antioxidant Activities

ZHENG Hu-Zhe1 , 2 , LEE Hye-Ryun1 , CUI Chun-Lan2 , HWANG In-Wook1 ,
KWON Sun-Young1 , CHUNG Shin-Kyo1

1. 1 Department of Food Science and Technology , Kyungpook National University , Daegu 702 - 701 , Korea ;
2 Agricultural Products Analysis Center, Liaoning Agricultural College , Yingkou 115009 , China
• Received:2007-05-24 Online:2008-02-25 Published:2008-02-25
• Contact: Chung Shin-kyo

Abstract:

The amounts of flavonoid (myricetin , quercetin and kaempferol), antioxidant contents ( total phenolic and total flavonoid) and antioxidant activities (DPPH and FRAP) were analyzed in strawberry. Quantitative analysis of conjugated flavonoid contents were obtained after different hydrolysis concentration and reaction period . The highest yields of myricetin and quercetin were found with 1.0M HCl and a reaction period of 0.5 hr, however , for kaempferol was 1.0M HCl and a reaction period of 1hr , respectively. In the study, we also estimated the correlation coefficient of TPC, TFC, DPPH and FRAP. In addition , a positive correlation was observed ( r = 0.980, P < 0.05) between TPC and TFC, TPC and TFC are correlated to the DPPH activity (r = 0.913, P < 0.05 and r = 0.899 , P < 0.05 , respectively) , and to the FRAP activity ( r = 0.958, P < 0.05 and r = 0.936, P < 0.05, respectively), respectively. These results pointed out that strawberry generally possesses a high level of antioxidant activities, which could be linked to the levels of phenolic compounds in the fruit.

Key words: Strawberry

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