Korean Journal of Plant Resources (한국자원식물학회지)

The Plant Resources Society of Korea (한국자원식물학회)
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Antioxidative Activity and Flavonol Glycosides Analysis in Callus Derived from Leaf Tissue of Ginkgo biloba L.

은행(Ginkgo biloba L.)의 잎 유래 캘러스의 항산화능력 및 플로보놀 배당체 검정

  • 김정숙 (조선대학교 자연과학대학 생물학과) ;
  • 박혜정 (조선대학교 자연과학대학 생물학과) ;
  • 박현용 (조선대학교 자연과학대학 생물학과)
  • Received : 2011.06.14
  • Accepted : 2011.08.09
  • Published : 2011.08.31
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Abstract

This study was carried out to establish an in vitro culture method of callus having a high antioxidant activity from Ginkgo biloba L. Leaf explants were cultured on Murashige and Skoog's medium supplemented with various growth regulators. The explants were incubated in the dark or 3,000 lux cool-white light. Methanol extracts from incubated callus were evaluated for scavenging activity of the free radicals using DPPH. The best callus growth rate was achieved in MS medium combined with 10 ${\mu}M$ NAA and 5 ${\mu}M$ kinetin in the light condition. Total antioxidant activity of cell aggregates in suspension culture [MS medium supplemented with 10 ${\mu}M$ NAA in the light] was up to 80% of ascorbic acid. By means of HPLC analysis, quantification of the quercetin dehydrate and keamperol profiles from suspension callus was compared. Contents of quercetin dehydrate and keamperol from leaf extracts were 0.07 and 2.24 ${\mu}g/20{\mu}l$, and those from callus 0.56 and 0.18 ${\mu}g/20{\mu}l$, respectively.

본 연구에서는 조직배양을 통해 은행나무 잎으로부터 캘러스를 유도하였고, 최대 생장량과 항산화능이 우수한 배양조건을 확립하였다. 즉, 은행잎을 이용하여 조직배양한 결과 암과 광조건에서 모두 NAA 첨가 조건이 2,4-D 첨가 조건에 비교하여 양호한 캘러스 생장을 나타냈다. 가장 우수한 캘러스 생장을 나타낸 배양조건은 광조건의 10 ${\mu}M$ NAA와 5 ${\mu}M$ kinetin의 조합 처리시였다. 따라서 현탁배양에서 캘러스의 지속적인 유지를 위한 효과적인 생장조절제는 10 ${\mu}M$ NAA/0.5 ${\mu}M$ BA, 10 ${\mu}M$ NAA/0.5 ${\mu}M$ kinetin으로 나타났다. 또한 은행잎 유래 캘러스 추출물의 항산화능은 광조건에서 10 ${\mu}M$ NAA가 처리된 기본 MS배지에 캘러스를 현탁 배양하였을 때 가장 높게 나타났다. HPLC를 통한 flavonol glycosides를 분석한 결과 10 ${\mu}M$ NAA가 처리된 조건에서 현탁 배양된 녹색 캘러스에서 quercetin dehydrate와 keamperol이 각각 0.556, 0.157 ${\mu}g$/20 ${\mu}l$ 검출되었다. 잎 추출물에 비해 표적물질을 제외한 불순물이 적어 표적물질의 순수생산이 가능할 것으로 기대되며, 특히 keamperol의 경우 기존의 연구보고에 비해 약 7배 높은 함량이 검출되었다.

Keywords

References

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