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Stability of Functional Properties and Chemical Components of Gamma-Irradiated Astragali Radix

감마선 조사 황기의 기능성 및 화학적 성분에 대한 안정성 평가

  • 정일윤 (한국원자력연구소 방사선식품·생명공학연구팀)
  • Published : 2005.02.01

Abstract

Stability of functional properties and chemical components of gamma-irradiated Astragali Radix (AR) were investigated to study the application of radiation technology for preservation and hygiene of medicinal herbs. Thus, ethanolic extracts and ethyl acetate fractions were prepared from gamma-irradiated and gamma-nonirradiated AR, respectively. Functional properties were estimated by comparing antioxidant activity (DPPH radical scavenging activity, lipid peroxidation inhibitory activity) and protective effect against oxidative DNA damage in human lymphocytes. Chemical components were compared by HPLC analysis, comparing with calycosin ($_{t}$ R= 15.111 min), which was isolated from ethyl acetate fraction as a standard material. Their antioxidant activities and protective effects against oxidative DNA damage showed no significant difference at the concentrations tested. HPLC analysis also showed almost same pattem. These results suggest that the functional properties and chemical components of AR are not affected largely by gamma irradiation, and radiation technology can be applied to preservation and hygiene of medicinal herbs.s.

방사선 조사 황기(Astragall Radix)에 대한 기능성 및 화학적 성분에 대한 안정성을 평가하였다. 기능성 평가시험으로서 방사선 조사 황기의 ethanol추출물 및 ethyl acetate분획물에 대한 DPPH 라디칼 소거 활성은 4∼28%및 13∼50%를 각각 보였으며 비조사 황기는 4∼29% 및 17∼57%로서 거의 동등한 라디칼 소거활성을 보였다(p>0.07).지질과 산화 억제시험에서 방사선 조사 황기의 ethanol추출물 및 ethyl acetate 분회 물은 각각 17∼54% 및 50∼84%의 억제활성을 보였고 비조사 황기는 각각 16∼58% 및 52∼86%를 나타냄으로써 지질과산화 억제활성도 방사선 조사에 거의 영향을 받지 않는 것을 알 수 있었다(p>0.05). Comet assay를 이용한 DNA 방어효과 시험에서 방사선 조사 황기의 ethanol 추출물 및 ethyl acetate 분획물은 24∼55% 및 49∼58%였고 비조사 황기는 각각 20∼46% 및 38∼54%로써 거의 동등한 DNA의 산화적 경감효과를 보였다(p>0.05).화학적 성분에 대한 안정성 평가시험인 HPLC분석시험에서 방사선 조사 황기의 ethyl acetate 분획물은 비조사 황기의 ethyl acetate 분획물과 거의 대등한 peak 양상을 나타냄으로써 화학적 성분의 안정성이 유지되는 것을 확인할 수 있었다. 따라서 방사선 조사 황기에 대한 본 연구의 결과와 이전의 유전독성학적 안전성 결과를 종합하여 볼 때 부가적인 실험이 동반된다면 실제적으로 위생화를 위한 방사선 조사 품목의 하나로서 그 적용 가능성이 시사되었다.

Keywords

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