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추출방법 및 용매에 따른 청나래고사리의 항산화 활성

Antioxidant Activities of Ostrich Fern by Different Extraction Methods and Solvents

  • Shin, So-Lim (Department of Horticultural Science, Chungbuk National University) ;
  • Lee, Cheol-Hee (Department of Horticultural Science, Chungbuk National University)
  • 투고 : 2010.08.31
  • 심사 : 2011.01.19
  • 발행 : 2011.01.30

초록

본 연구는 청나래고사리 성엽 추출물의 항산화물질의 함량과 항산화능을 향상시킬 수 있는 효과적인 추출방법을 개발하기 위하여 시행하였다. 동결건조한 청나래고사리 성엽의 분쇄시료 1 g을 메탄올, 80% 에탄올 및 물 등 3가지 용매와 섞은 후 6시간 동안 상온 침지, $60^{\circ}C$ 가열 및 200 rpm에서 교반하여 추출하거나 42 kHz의 초음파 수조에서 15, 30, 45분 동안 추출하였다. 추출물은 여과한 다음 가용성고형분, 총 폴리페놀 및 총 플라보노이드의 함량을 측정하였으며, 항산화활성은 DPPH와 ABTS radical 소거활성을 $RC_{50}$으로 환산하여 측정하였다. 80% 에탄올을 용매로 하여 30분 동안 초음파추출 하였을 때 가용성고형분(0.317 $g{\cdot}g^{-1}$ db), 총 폴리페놀(70.90 $mg{\cdot}g^{-1}$ db) 및 총 플라보노이드(41.53 $mg{\cdot}g^{-1}$ db)의 추출수율이 가장 우수하였으며, DPPH와 ABTS radical 소거활성 또한 가장 우수하였다(각 $RC_{50}$=0.14 $mg{\cdot}ml^{-1}$와 0.09 $mg{\cdot}ml^{-1}$). 상기의 연구결과에 따라 청나래고사리의 성엽은 천연항산화소재로 활용가능하며, 80% 에탄올을 용매로 15-30분 동안 초음파추출하는 것이 추출물의 항산화효과를 증가시키며 추출에 소요되는 시간을 줄일 수 있는 효과적인 추출방법으로 생각되었다.

This study was performed to investigate effective extract conditions in fronds of the Ostrich fern (Matteuccia struthiopteris) to increase antioxidant compound contents and antioxidant capacity. Powder (1 g) of lyophilizated fronds were mixed with 3 kinds of solvents (MeOH, 80% EtOH and water). Extractions were carried out using not only immersion (room temp.), heating ($60^{\circ}C$) and stirring (200rpm) for 6 hr, but also through sonication in a 42 kHz ultrasonic bath for 15, 30 and 45 min. Extracts were filtrated and measured for contents of soluble solids (SS), total polyphenols (TP; tannic acid as a standard) and total flavonoids (TF; Naringin as a standard). Antioxidant activity was expressed as $RC_{50}$ for DPPH and ABTS radical scavenging. SS (0.317 $g{\cdot}g^{-1}$ db), TP (70.90 $mg{\cdot}g^{-1}$ db) and TF (41.53 $mg{\cdot}g^{-1}$ db) contents reached their highest levels when 30 minute sonication extraction with 80% EtOH was performed, and the highest DPPH and ABTS scavenging activity was observed in the same extraction conditions ($RC_{50}$=0.14 $mg{\cdot}ml^{-1}$ and 0.09 $mg{\cdot}ml^{-1}$, respectively). From the present investigation, it can be concluded that fronds of the ostrich fern can be used as a natural material for antioxidants, and sonication for 15-30 min with 80% EtOH is an ideal extraction method for increasing their antioxidant effects and saving extraction time.

키워드

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