Microbiology and Biotechnology Letters (한국미생물·생명공학회지)

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Anti-Oxidant Property and Inhibition of Melanin Synthesis of Eight Plant Extracts

수종의 식물수출물의 항산화 및 Melanin 합성 억제효과

  • Received : 2010.08.12
  • Accepted : 2010.11.16
  • Published : 2010.12.28
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Abstract

Plants extracts are good resources to find functional compounds for human health. The following eight plants were collected and total phenolic contents were determined. Acer psedo-siebolianum showed the highest phenolic contents, 16.4 mg/g, whereas Cercidiphyllum japonica showed the lowest contents, 1.9 mg/g. The DPPH free radical scavenging capacities of the plant extracts showed high activity in following order : Acer ginnala ($21.3\;{\mu}g/mL$) > Cornus walteri ($23.9\;{\mu}g/mL$) > Distylum racemosum ($29.2\;{\mu}g/mL$) > Castanopsis cuspidata var. Thunbergii ($31.7\;{\mu}g/mL$) > Acer psedo-siebolianum ($34.6\;{\mu}g/mL$) > Thuijopsis dolabrata cv. Aurea ($53.1\;{\mu}g/mL$) > Cercidiphyllum Japonica ($115.2\;{\mu}g/mL$). Also the mushroom tyrosinase inhibitory activities of total extracts were determined at different concentration. D. racemosum extract showed highest (49.1% at 1,000 mg) in inhibitory activity than other seven extracts. The ethanol fraction $IC_{50}$ value: $118.1\;{\mu}g/mL$) from D. racemosum showed more inhibitory activity than ethyl acetate fraction ($IC_{50}$ value: $203\;{\mu}g/mL$). The ethanol fraction on showed no significant cytotoxicity in B16/F1 cells line up to $60\;{\mu}g/mL$. Over $80\;{\mu}g/mL$ of ethanol fraction showed cytotoxicity in B16/F1 cells. The melanin contents of cells were significantly attenuated by ethanol fraction in a dose-dependent manner. The $IC_{50}$ value of ethanol fraction was $75.4\;{\mu}g/mL$.

본 연구에서는 식물 추출물을 이용하여 항산화 활성 및 tyrosinase 활성 억제 효과를 측정하였다. 식물 추출물의 폴리페놀물질의 총 함량은 Acer psedo-siebolianum의 추출물이 16.4 mg/g로 가장 높은 추출량을 나타내었다. 항산화 활성 측정에서는 Acer ginnala 에서 $IC_{50}$값으로 $21.3\;{\mu}g/mL$으로 가장 좋은 활성을 나타내었다. 반면에 L-DOPA를 기질로 하여 mushroom tyrosinase의 활성 억제측정에서는 Distylum racemosum 1,000 mg에서 49.1%로 다른 추출물에 비하여 상대적으로 높은 활성을 나타내었다. Tyrosinase 활성 억제력이 가장 높은 D. racemosum의 추출물을 이용하여 ethanol 분획과 ethyl acetate 분획으로 분리하여, 이중 D. racemosum의 ethanol 분획에서 항산화 활성 $IC_{50}$ 값은 $0.9\;{\mu}g/mL$, tyrosinase 활성억제는 $IC_{50}$값이 $118.1\;{\mu}g/mL$로 ethyl actate 분획보다 높은 활성을 나타내었다. 또한 ethanol 분획을 이용하여 B16/F1 melanoma cell에서는 $60\;{\mu}g/mL$까지는 세포독성을 나타내지 않았으며 $80\;{\mu}g/mL$의 농도에서 약간의 세포독성을 나타내었다. 에탄올 분획을 이용한 세포내 melanin 색소의 생산억제 $IC_{50}$값은 $75.4\;{\mu}g/mL$로 분석되었다. 이러한 결과로 D. racemosum의 에탄올 추출물이 B16/F1 melanoma cell세포의 melanin색소합성대사에 관여하여 색소합성을 저해하는 것으로 보인다.

Keywords

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