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Physiological Activities of Gardeniae Fructus Extracts by Microwave-Assisted Extraction as Affected by Solvents

마이크로웨이브로 추출한 용매별 치자(Gardeniae Fructus) 추출물의 생리활성

  • Published : 2008.03.31

Abstract

Gardeniae Fructus (GF) is a fruit of Gardenia jasminoides Ellis (Rubiaceae) which has been used in traditional medicine. It contains not only geniposide but also resveratrol, a kind of stilbene as a natural antioxidant. In this study, we investigated physiological activities of GF extracts by measuring electron donating ability (EDA), nitrite scavenging ability (NSA), super oxide dismutase (SOD)-like activity and inhibitory effect of tyrosinase activity (ITA). As a solvent, it was extracted with water, 50 and 100% ethanol using microwave. At the concentration of 6 mg/mL, EDA was the highest at 50% ethanol extract but the lowest at 100% ethanol extract, $96.43{\pm}0.25%\;and\;77.06{\pm}0.22%$ respectively. NSA showed the strongest activity at 50% ethanol extract like EDA (6 mg/mL: $75.26{\pm}0.28%$). ITAs were below 20% in all samples and their activities reduced according to increasing concentration. Likewise, SOD-like activities decreased with increasing concentration of extracts in all samples. In conclusion, GF extracts showed low SOD-like activities and ITAs but EDAs and NSAs were fairly high; especially EDA of 50% ethanol extract (6 mg/mL) was high as those of 0.1 and 1% L-ascorbic acid. Therefore the results suggest that GF extracts may be useful as potential sources of natural antioxidants.

추출용매를 달리하여 마이크로웨이브로 추출한 치자의 생리활성을 측정하였다. 치자를 물, 50% 및 100% 에탄올을 용매로 하여 마이크로웨이브로 추출하였고, 이의 생리활성을 측정하였다. 세 종류의 추출용매 중 50% 에탄올 추출구의 생리활성이 다른 추출구에 비해 높은 경향이었으며 100% 에탄올 추출구의 활성은 낮은 편이었다. 전자공여능은 0.6 mg/mL 농도일 때 50% 에탄올 추출물의 활성이 $96.43{\pm}0.25%$로 0.1, 1% L-ascorbic acid와 유사한 활성이 있었고, 아질산염 소거능은 $71.99{\pm}3.71%$로 0.1, 1% L-ascorbic acid에는 못 미쳤지만 0.01% L-ascorbic acid보다 우수한 활성이 있었다. 티로시나아제 저해활성은 $11{\sim}19%$로 모든 추출물에서 20% 미만의 낮은 활성을 보였고 물과 50% 에탄올 추출구는 농도에 반비례하여 활성이 증가하는 양상이었다. SOD 유사활성도 티로시나아제 저해활성과 유사한 결과로 모든 추출구가 농도 증가에 따라 활성이 감소하였으며 전체적으로 40% 미만의 활성이 있었다. 결론적으로 치자 추출물은 SOD 유사활성 및 티로시나아제 저해 효과는 높지 않지만 우수한 전자공여능과 아질산염 소거능이 있는 것으로 판단되므로 천연 항산화제로서 이용될 수 있는 가능성이 있었다.

Keywords

References

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