• 한국응용약물학회:학술대회논문집
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• 한국응용약물학회 2003년도 Annual Meeting of KSAP : International Symposium on Pharmaceutical and Biomedical Sciences on Obesity
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• pp.69-69
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• 2003

There are now increasing evidences that free radicals and reactive oxygen species are involved in a variety of pathological events. Reactive Oxygen Species (ROS) are produced during normal cellular function. ROS lead to lipid peroxidation, massive protein oxdiation and degradation. Under normal conditions, antioxidant are substnaces that either directly or indirectly protect cell against adverse effect of ROS. several biologically important compound include ${\beta}$-carotene, taruine and flavonoids reported have antioxidant function. The various antioxidant either scavange superoxide and free radicals or stimulate the detoxification mechanisms within cells resulting in increased detoxification of free radicals formation and thus in prevention of many pathophysiologic processes. This study carried out to investigate the antioxidant activity of flavonoids, myricetin with other antioxidants, ${\beta}$-carotene and taurine on B16Fl0. In order to investigate the efficacy of antioxidant activity, we measured cell viability, antioxidant enzyme activity (SOD, GPX, CAT) and intracellular reactive oxygen intermediate (ROI). In this results, we show that these flavonoids with other antioxidant substrates are increased antioxidant activity level.

• 생명과학회지
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• 제32권2호
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• pp.167-174
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• 2022

현대사회에서 산화물질에 의한 스트레스가 증가함에 따라 항산화제에 대한 관심이 증가하고 있다. 그러나 합성 항산화제는 다량 섭취 시 유해하다는 연구 등에 기인하여 수요가 감소하고 있으며, 합성 항산화제를 대체하기 위하여 천연물에서 유래된 항산화 물질에 관한 연구가 활발히 진행되고 있다. 세계 10대 장수 식품의 하나로 알려진 블루베리는 진달래과(Ericaceae) 산앵도나무속(Vaccinium)의 식물로 항산화를 비롯한 다양한 약리활성에 대한 연구가 수행되었다. 정금나무(Vaccinium oldhamii)는 블루베리와 같은 속에 속한 낙엽활엽관목으로 본 논문에서는 정금나무의 추출물과 정제물의 효능 분석을 실시한 연구들을 정리하였다. 정금나무 열매의 페놀류 화합물의 함량은 항산화 활성 및 항인플루엔자 활성과 비례하였으며, 총 폴리페놀 및 안토시아닌의 함량은 블루베리에 비해 높았다. 정금나무 열매 추출물은 항염증 활성을 나타내었으며 정금나무 가지 추출물은 항염증 활성과 염증반응에 의한 파골세포의 분화 및 골흡수를 억제하는 활성을 나타내었다. 정금나무 열매 추출물은 인간 급성 백혈병에 대한 항암 활성을, 정금나무 가지 추출물은 여러 인간 암세포주에서의 항암활성을 나타내었다. 정금나무는 블루베리에 비하여 페놀성 화합물 함량과 항산화 활성이 높고 다양한 생리활성을 나타내며, 국내에 자생하여 대량 재배를 위한 연구가 용이하고, 상업화 시 해외 사용료를 부담할 필요가 없는 등 블루베리의 대체작물로서의 가치를 충분히 가지고 있다고 판단된다.

• 생약학회지
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• 제41권2호
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• pp.130-135
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• 2010

This study was performed to the activity of antioxidant and anti-diabetic from Zanthoxylum schnifolium fruit. The Zanthoxylum schnifolium fruits were extracted with water, 100% methanol, 100% ethanol, 70% methanol and 70% ethanol. The activities of each extracts were measured by antioxidant tests, such as total phenolic contents, total flavonoid contents, hydroxyl radical activity, DPPH radical scavenging activity, reducing power and $\alpha$-glucosidase inhibition activity assay. The water extract represented the highest activity in the antioxidants properties in vitro, including hydroxyl radical activity, DPPH radical scavenging activity, reducing power. Furthermore, water extract also showed significantly high total phenolic contents but the 100% methanol extract showed high total flavonoid contents estimated as $196.48{\mu}g/mg$. The $IC_{50}$ values for $\alpha$-glucosidase inhibition activity of the 100% ethanol and 100% methanol extracts were $275.66{\mu}g/mg$ and $261.44{\mu}g/mg$. Our results indicated that the Zanthoxylum schnifolium fruit expected to be useful as antioxidants.

• Natural Product Sciences
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• 제11권3호
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• pp.155-159
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• 2005

The aqueous extract of Coscinium fenestratum was studied for its antioxidant status in STZ-nicotinamide induced type 2 diabetic rats at two dose levels of 250 mg/kg and 500 mg/kg. At the end of the experimental period, diabetic rats treated with aqueous extract at both dose levels showed a significant increase in the levels of enzymatic antioxidants such as glutathione peroxidase, glutathione synthetase, peroxidase, superoxide dismutase and catalase as compared to the untreated control. Similarly, a significant increase was also observed in the levels of the non enzymatic antioxidants ceruloplasmin, ascorbic acid and tocopherol. The results suggest that the aqueous stem extract of C. fenestratum prevents type 2 diabetes mellitus induced oxidative stress.

• Journal of Nutrition and Health
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• 제22권6호
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• pp.466-475
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• 1989

This research was to investigate the effects of sardine oil with different antioxidants on tissue lipid peroxidation and the activity of superoxide dismutase in rats. Young male rats were fed for 6 weeks on different experimental diets containing 10% (w/w) sardine oil with $\alpha$-tocopherol (800mg / kg oil), $\delta$-tocopherol(1, 000mg / kg oil) or rosemary extract(1, 000mg /kg oil) as antioxidant and also sardine oil lard without antioxidant as control. In sardine oil group tissue lipid peroxide level and percentage of hemolysis were increased compared to those of lard group. By the addition of antioxidants, percentage of hemolysis reduced significantly but the lipid peroxide level in liver was unaffected. The activities of superoxide dismutase in erythrocyte and liver were not affected by either sardine oil ingestion or different antioxidants.

• 한국자원식물학회지
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• 제26권3호
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• pp.347-354
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• 2013

Apple and pear are popular fruits consumed in Korea and are common fruit in daily diet. In order to compare the antioxidant activity of the apple and pear peels, total polyphenol contents, total flavonoid contents, $ABTS^+$ free radical scavenging activity, and DPPH free radical scavenging activity were measured from hot water, ethanol, and methanol extracts of the two fruit peels. The total polyphenol and flavonoid contents were highest in 95% methanol extracts of the apple peelsand 70% ethanol extract of the pear peels, respectively. Total polyphenol contents of the pear peels were higher than that of apple peels, and total flavonoid contents of the apple peels were higher than that of pear peels. The apple and pear peels had the highest $ABTS^{+{\cdot}}$ and DPPH free radical scavenging activity in 95% methanol extracts and 70% ethanol extracts, respectively. $ABTS^{+{\cdot}}$ and DPPH free radical scavenging activity of pear peels was higher than that of apple peels, and the DPPH free radical scavenging activity of apple and pear peels were detected in hot water, 95% methanol, and 70% ethanol extracts, respectively. Ascorbic acid, a synthetic antioxidant used as positive control, had significantly higher scavenging activity than the apple and pear peels. In conclusion, the apple and pear peelshave great potential as natural antioxidants. Therefore, above results should be considered to provide the possibility for the development of high functional antioxidants.

• 한국연초학회지
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• 제29권2호
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• pp.90-97
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• 2007

This study was conducted to evaluate the effect of additives (antioxidants for free radicals reduction) in cigarette filter treated with various antioxidants (three types of proanthocyanidins and ascorbic acid) and various concentrations of ascorbic acid and loaded with activated carbon on the delivery of free radicals of mainstream smoke (MS) by ESR. Also, we analyzed Hoffmann's analytes andscavenger activity according to the storage time and in vitro cytotoxicity. The analysis of spin number of vapor and particulate phase free radicals in MS are decreased to $14{\sim}24\;%$ and $16{\sim}40\;%$, respectively. As aresult of antioxidant potential for inactivity of vapor and particulate phase free radicals, natural antioxidants were more effective than ascorbic acid. Based on the result of the analysis of Hoffmann's analytes for various antioxidantstreated cigarette filters during the smoking, cigarette filter treated with ascorbic acid showed the lower amount of the deliveries of hydroquinone, isoprene and quinoline in MS than those treated with the other antioxidants. In the significant t-test on the difference of the cytotoxicity among the various antioxidants treated-cigarette filters, there are no significant differences at the 95 % confidence level. Those results indicated that the antioxidants were useful for reducing free radicals in MS because of the fast reaction between antioxidant and free radicals.

• KSBB Journal
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• 제18권1호
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• pp.45-50
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• 2003

송이의 공시균(KFR1432)과 실험실에서 자체 분리한 균(YxT, WxT, $\textrm{NK}_3\textrm{T}$)의 생장속도의 차이와 FE SEM으로 확인한 미세구조의 차이로 공시균과 자체 분리균이 서로 다른 균임을 확인할 수 있었다. Tyrosinase 활성 억제 실험을 위해 각각 균사체의 열수 추출물, 에탄올 추출물, 배양액을 hexane, chloroform, ethyl acetate로 분획하였다. 그 결과 모든 균의 ethyl acetate 분획층과 수층에서 tyrosinase 활성을 억제하는 것으로 나타났으며, KFR1432의 ethyl acetate 분획층과 YxT의 수층에서 억제율이 100%를 넘어 큰 저해 활성을 보였다. 또한 항산화제 처리 결과 ascorbic acid와 glutathion은 생장을 다소 증가시키거나 별 영향을 주지 못한 반면, tocopherol 의 경우 농도가 높아질수록 생장을 억제하는 것으로 나타났다. Tyrosinase 활성 억제에 있어서는 모든 항산화제 처리구에서 무처리구에 비해 높은 억제율을 보였다.

• Journal of the Korean Wood Science and Technology
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• 제45권6호
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• pp.720-727
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• 2017

Antioxidants are known to affect the feeding habits of termites and a good source is pine bark which contains high levels of antioxidants which can be extracted with neutral solvents. In this study procyanidins (PCs)-rich MeOH-extract and a hot-water extract (HWE) were prepared from Pinus radiata bark. HWE was further separated into crude PCs (CPCs), polymeric PCs (PPCs), and low-molecular-weight PCs (LMWPCs) fractions. The MeOH extract and these fractions were examined for termite (Reticulitermes flavipes Kollar) antifeedant activities using a no-choice test. Catechin was used as a positive control. The LMWPCs was found to be the most effective deterrent to termite feeding. The comparative efficiency of the compounds tested were LMWPCs > PPCs > CPCs > MeOH extract, with the latter being more dependent on molecular weight than on its antioxidant activity.

• Plant Resources
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• 제8권2호
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• pp.103-109
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• 2005

Lettuce (Lactuca sativa L.) is known to contain water-soluble substances that improve antioxidant status due to the richness in antioxidants. Greenhouse experiment was carried out under different shading conditions during spring lettuce growing season. Shade significantly reduced shoot weight, number of leaves and chlorophyll content, while it increased shoot length of lettuce plants. The antioxidant potential of the individual fraction was in order of n-butanol > ethyl acetate > water > n-hexane fraction, although was less than that of commonly used antioxidants, BHT and ascorbic acid. Fractions from lettuce plants dose-dependently increased DPPH free radical scavenging activity, in vitro test. By means of HPLC analysis, BuOH fraction of cultivar 'Hwahyang' (57.93 mg $100g^{-1}$) had the highest amount of antioxidant chi orogenic acid. Shading treatment increased average amount of chlorogenic acid of all cultivars in BuoH, EtOAc, hexane and water fractions by 33, 120, 144, and $58\%$, respectively. These results suggest that lettuce plants had potent antioxidant activity, and their activities were differently exhibited depending on cultivar and fraction.