This study was to conducted to investigate the antioxidative activity of 70% ethanol extracts of kiwi of three different colors (gold, green and red) by measuring DPPH, ABTS radical scavenging activity, tyrosinase inhibitory effect, metal chelating effect, reducing power, and nitrite scavenging activity. Total polyphenol contents were: gold kiwi, 3.09 mg GAE/g, green kiwi 2.71 mg GAE/g, and red kiwi 4.59 mg GAE/g, respectively. Red kiwi showed higher antioxdidant activity than gold and green kiwi. DPPH and ABTS radical scavenging activity, and nitrite scavenging activity of red kiwi exhibited 94.83, 99.57, and 97.88%, respectively, at a concentration of 20 mg/mL, which were equal to those of ascorbic acid (positive control). Metal chelating effect of red kiwi was superior to that of ascorbic acid. Therefore, the availability of red kiwi will be increased in the field of functional material for food additives and value added products.

Abstract
 I. 서 론
 II. 연구 내용 및 방법
  1. 재료
  2. 추출액의 제조 및 추출수율 측정
  3. 총 폴리페놀 함량 측정
  4. DPPH radical 소거능 측정
  5. ABTS radical 소거능 측정
  6. Tyrosinase 저해 효과
  7. Metal chelating effect 측정
  8. 환원력 측정
  9. 아질산염 소거능 측정
  10. 통계처리
 III. 결과 및 고찰
  1. 추출 수율 및 총 폴리페놀 함량
  2. DPPH radical 소거능
  3. ABTS radical 소거능
  4. Tyrosinase 저해 효과
  5. 금속 킬레이트 효과
  6. 환원력
  7. 아질산염 소거능
 IV. 요약 및 결론
 References

• 정해정(대진대학교 식품영양학과) | Hai-Jung Chung Corresponding author
• 김천제(건국대학교 축산식품생물공학과) | Cheon-Jei Kim
• 최윤상(한국식품연구원 식품가공기술연구센터) | Yun-Sang Choi