• 대한한의학방제학회지
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• 제13권2호
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• pp.101-110
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• 2005

The present study was conducted to compare antioxidant activity of Cuscutae Semen, Psoraleae Fructus, Cnidii Fructus and Epimedii Herba by DPPH radical scavenging activity. The extract was studied using diphenyl-picryl-hydrazyl (DPPH) for DPPH method. DPPH radical scavenging activity was measured after. .10, 20 and 30 minutes. The extract was tested by 1, 5, 10, 50, 100, 500 and $1000{\mu}g/ml$ concentrations. The results showed that the extract scavenged DPPH radical with time-dependent manner. Also, the extract showed dose-dependent DPPH radical scavenging activity. The extract of Cuscutae Semen, Psoraleae Fructus, Cnidii Fructus and Epimedii Herba scavenged DPPH radical with the IC50 being 2.7, 3.2, 2.9 and 1.1 mg/ml, respectively. In conclusion, the extract of Epimedii Herba, Cuscutae Semen, Cnidii Fructus and Psoraleae Fructus have antioxidant activity for the treatment of male sterility.

• 한국자원식물학회:학술대회논문집
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• 한국자원식물학회 2005년도 International Symposium & conference of the Plant Resources Society of Korea
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• pp.177-178
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• 2005

• 약학회지
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• 제45권5호
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• pp.494-499
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• 2001

Houttuynia cordata (Saururaceae) has pungent smell and taste. It has been regarded as detoxicant, antipyretic, antiinflammantory and diuretic agents. In order to evaluate antioxidative and antilipidperoxidative efficacies, its fractions ($H_2O$, 20% MeOH, 40% MeOH, 60% MeOH, 170% MeOH) were measured by DPPH method and TBARS assay on rat liver homogenate. It was revealed that 60% MeOH fractions had potential antioxidative activity and inhibited lipid peroxidation significantly: In active fractions, we isolated rutin, hyperin, quercitrin and quercetin.

• 산업식품공학
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• 제15권3호
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• pp.221-229
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• 2011

Optimization study of the hot water extraction for enhancing antioxidative activity from Auricularia auricula was performed by Taguchi approach using orthogonal matrix $L_9(3^4)$ method. The correlation between DPPH radical scavenging activity and the components of samples extracted from different extraction conditions were also analyzed. The correlation coefficient between DPPH radical scavenging activity and melanin content of A. auricula were 0.93, indicating 'good correlation'. The optimum extraction conditions was obtained at the extraction time of 1 hr. temperature of $85^{\circ}C$, solid: water ratio of 1: 40(w/v) and frequency of 2 times. Under these conditions, values of maximum DPPH free radical scavenging activity and melanin contents of A. auricula were $67.21{\pm}2.17$ and $52.94{\pm}2.10 mg/g$, respectively. Melanin content of 1.6 times and DPPH free radical scavenging effect of 130% were enhanced by optimization.

• 생명과학회지
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• 제23권7호
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• pp.913-918
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• 2013

해조류 유래 유용성분 추출을 위한 초음파 추출법의 적용성을 검토하였다. 동결건조한 감태 분말로부터 열수($65^{\circ}C$), 물($24^{\circ}C$), 50% 에탄올 및 100% 에탄올 뿐만 아니라 초음파 추출을 수행하여, 추출물을 제조하였다. 추출물의 페놀성 화합물 함량, DPPH 라디칼 소거 활성 및 tyrosinase 저해 활성을 분석하고, 초음파 추출과 전통적인 추출법의 차이를 비교하였다. 초음파 추출에 의한 감태 추출물의 페놀성 화합물의 함량(142.80 mg/g)은 열수 추출물의 페놀성 화합물 함량(10.03 mg/g)의 약 14배 이상 높았다. 열수 추출물에 비해 초음파 추출물의 DPPH 라디칼 소거 활성은 약 4배, tyrosinase 저해 활성은 약 14배 이상 높은 것으로 나타났다. 특히 초음파 추출법에 의한 추출물에서의 페놀성 화합물 함량과 DPPH 라디칼 소거활성 및 페놀성 화합물 함량과 tyrosinase 저해 활성간의 상관관계가 매우 높은 것(각각 $R^2$=99.47 및 99.99)으로 나타났다. 이상의 결과는 전통적인 용매 추출법보다 초음파 추출법이 감태의 유용성분 추출에 더 적합함을 의미한다.

• KSBB Journal
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• 제19권5호
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• pp.381-384
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• 2004

The antimicrobial and antioxidative activities were investigated to confirm the utility of wood vinegar. Antimicrobial activity was performed by paper disc method and liquid culture. The growth inhibition was observed in all microbial species at a dose of as low as 25 $\mu$m of wood vinegar by paper disc method. Also, in liquid culture, S. cerevisiae and P. aeruginosa were more inhibited the growth than others in the concentration of $2\%$ (v/v). For measuring of antioxidative activity, wood vinegar was fractionated with acidic, phenolic, basic and neutral fraction; and their antioxidant activities were measured by the radical scavenging effect on DPPH radical. In four fractions, phenolic fraction showed high antioxidative activity.

• 한국식품저장유통학회지
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• 제24권3호
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• pp.361-366
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• 2017

본 연구에서는 원적외선 건조 조건에 따른 홍삼 절편의 품질 특성을 알아보았다. TPC, TFC, DPPH의 경우 65도에서 가장 높은 값을 보였으며 이후에 감소하는 추세를 나타내었다. 건조온도를 65도로 고정한 후 0-90분 간 원적외선 건조를 진행했을 때, 60분에 약 10% 수분함량을 보였으며 TPC는 60-90분, TFC는 60분, DPPH는 75분에서 최고값을 나타내었다. 그리고 홍삼 절편에 원적외선, 열풍, 감압, 동결건조를 60분 간 처리한 후 비교했을 때, TPC와 TFC는 감압 및 원적외선 건조에서 유의적으로 높은 값을 보였으며, DPPH의 경우 열풍건조를 했을 때 가장 높은 활성을 나타내었다. 건조 방법에 따른 홍삼 절편의 색도를 비교하였을 때, L, a, b 값은 원적외선, 열풍, 감압 건조 시 감소하였고, 동결 건조 시에는 증가하였다.

• 한국작물학회지
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• 제50권5호
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• pp.336-339
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• 2005

Common thistle contains water-soluble substances that are antioxidative to foods. Antioxidant activities measured by DPPH method for the ground samples were the greatest in leaves, although was less than that of commonly used antioxidants, BHT and ascorbic acid. Methanol extracts and fractions from Xanthium occidentale plants dose-dependently increased DPPH free radical scavenging activity, in vitro test. The extracts from leaves showed the strongest antioxidant activity. DPPH scavenging activity of the individual fraction was in order of n-butanol>water>ethyl acetate>n-hexane fraction. By means of HPLC analysis, leaf samples of Xanthium occidentale had the highest amount of phenolic compounds, related with antioxidant activity, and followed by stems and roots. Total content of these antioxidant phenolic com­pounds for leaves extracts were detected in water fraction (36.7 mg 100 $g^{-1}$) as the greatest amount, especially chlorogenic acid (39.4 mg 100 $g^{-1}$) was the greatest component. These results suggest that Xanthium occidentale plants had potent antioxidant activity, and their activities were differently exhibited depending on plant part and fraction.

• 동의생리병리학회지
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• 제22권5호
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• pp.1158-1162
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• 2008

In genus Angelica, three species have been used and cultivated for medical material in orient, A. gigas in korea, acutiloba in Japan and sinensis in China. The plant material of Angelica spp. is used for the treatment of women's disease as a hematic. The extracts from A. gigas and acutiloba were fractionated aqueous partitions. And study was performed to examine DPPH scavenging activities, BSA degradadion, anti-apoptosis and NO scavenging. DPPH radical scavenger activity was measured by DPPH method, it was shown dose-dependently effect. and BSA degradadion was shown same result. Treatment of cells with hydrogen peroxide, a reactive oxygen species was to indiced cell death and pretreatment with Angelica gigas and angelica acutiloba extract attenuated the occurrence of $H_2O_2$-induced cell death. In vitro nitric oxide (NO) scavenging effect on Angelica gigas and angelica acutiloba extracts. All extracts effectively reduced the generation of NO radicals in a dose-dependant manner.

• Food Science and Biotechnology
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• 제15권3호
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• pp.482-484
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• 2006

The antioxidant activity of Bacillus polyfermenticus SCD was studied by partially purified culture extracts using various methods: ammonium sulfate precipitation, adsorption to Diaion HP-20 columns using polar solvents, and extraction using non-polar solvents. The 1,1-diphenyl-2-picyrylhydrazyl (DPPH) radical scavenging activity of these partially purified fractions was then investigated. The precipitate isolated using 75%-saturated ammonium sulfate was shown to contain about 77.2% DPPH radical scavenging activity. Using the Diaion HP-20 resin adsorption method, the fraction obtained using 60% ethanol and 60% methanol possessed 76.7 and 89.5% DPPH radical scavenging activity, respectively. Fractions obtained by extracting with the non-polar solvents 80 mg/mL chloroform, 80 mg/mL n-hexane, 80 mg/mL ethyl acetate, and 80 mg/mL butanol contained 68.4, 75.0, 70.7, and 87.5% DPPH radical scavenging activity, respectively. Further study is needed to characterize the antioxidant substance(s) released by B. polyfermenticus SCD cultures.