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Antioxidant Activities of Rehmannia glutinosa by Traditional Methods

생지황을 이용하여 전통방법으로 제조한 숙지황의 항산화 활성

  • Kim, Hyo-Jin (Department of Food & Nutrition, Chungnam National University) ;
  • Lee, Ji-Yeon (Department of Food & Nutrition, Chungnam National University) ;
  • You, Bo-Ram (Department of Food & Nutrition, Chungnam National University) ;
  • Doh, Eun-Soo (Department of Oriental Pharmaceutical Science, Joongbu University) ;
  • Kim, Mee-Ree (Department of Food & Nutrition, Chungnam National University)
  • 김효진 (충남대학교 식품영양학과) ;
  • 이지연 (충남대학교 식품영양학과) ;
  • 유보람 (충남대학교 식품영양학과) ;
  • 도은수 (중부대학교 한방제약과학과) ;
  • 김미리 (충남대학교 식품영양학과)
  • Received : 2011.09.14
  • Accepted : 2011.10.05
  • Published : 2011.10.30

Abstract

The objective of this study was to evaluate antioxidant activities of Rehmannia glutinosa (Raw Jihwang) by traditional method. The total phenol content of Rehmannia radix Preparata (the final cycle of Jihwang) was increased to 205%, compared with Rehmannia glutinosa. Antioxidant activities, determined by ferric-reducing antioxidant potential (FRAP), 2,2'-azinobis(3 ethybenzothiazoline-6-sulfonic acid) (ABTS) radical scavenging activity, 1,1-diphenyl-2-picrydrazyl (DPPH) and hydroxyl radical scavenging activities, increased remarkably as the number of steaming-drying cycles increased. Especially, FRAP value increased 285%. Also, $IC_{50}$ values for DPPH and hydroxyl radical scavenging activities of the final 9th-cycling product, decreased 48.4% and 76%, respectively, compared with those of Rehmannia glutinosa. Our result was suggested that antioxidant activities of Rehmannia radix Preparata improve according to the increasing number of steaming-drying cycles.

Keywords

References

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