• Title, Summary, Keyword: DPPH

Search Result 5,302, Processing Time 0.054 seconds

Compositions of Astragali Radix and Angelicae Radix by DPPH Radical Scavenging Activity (당귀(當歸)와 황기(黃芪)의 배합 변화가 DPPH 자유기 소거에 미치는 영향 연구)

  • Kang, Soon-Ah;Oh, Myung-Sook;Kim, Do-Rim;Kang, Ji-Ung;Kim, Won-Nam;Park, Eun-Hwa;Chang, Mun-Seog;Park, Seong-Kyu
    • The Korea Journal of Herbology
    • /
    • v.21 no.1
    • /
    • pp.17-24
    • /
    • 2006
  • Objectives : This study was conducted to compare antioxidant activity of ratio-related Angelicae Radix and Astragali Radix compositions by DPPH radical scavenging activity. Methods : The species of Angelicae Radix was compared as Angelica gigas, A. sinensis and A. acutiloba. Then various compositions of Angelicae Radix with Astragali Radix were prepared with different ratio. Diphenyl-picryl-hydrazyl (DPPH) radical scavenging activity was measured after 10, 20 and 30 minutes. Each extracts were tested by 1, 5, 10, 50, 100, 500 and 1,000 ${\mu}g/ml$ concentrations. Results : The results showed that Angelica gigas, A. sinensis and A. acutiloba scavenged DPPH radical with 66.8, 61.7 and 56.7% in 1,000 ${\mu}g/ml$ concentration, respectively. According to this result, Angelicae Radix and Astragali Hadix compositions with 100:0, 10:1, 5:1, 3:1, 1:1, 1:3, 1:5, 1:10 and 0:100 ratio were scavenged DPPH radical with 56.3, 49.9, 61.2, 55.7, 54.7, 55.0, 52.8 ,md 50.2% in 1,000 ${\mu}g/ml$ concentration, respectively. The extract of Angelicae Radix and Astragali Radix compositions with 100:0, 10:1, 5:1, 3:1, 1:1, 1:3, 1:5, 1:10 and 0:100 ratio scavenged DPPH radical with the $IC_{50}$ being 85,21, 1016.26, 656.51, 785.67 and 956.74 ${\mu}g/ml$ respectively. Conclusion : In conclusion, the extract of Angelicae Radix and Astragali Radix compositions with 1:1 ratio showed dose-dependent DPPH radical scavenging activity.

  • PDF

Phenolic Content, DPPH Radical Scavenging, and Tyrosinase Inhibitory Activities of Ecklonia cava Extracted with the Ultrasonic Wave Method (초음파 추출법에 의한 감태 추출물의 페놀성 화합물 함량, DPPH 라디칼 소거 활성 및 tyrosinase 저해 활성 분석)

  • Kim, So Jung;Kim, Donggiun;Park, Jongbum;Lee, Taek-Kyun
    • Journal of Life Science
    • /
    • v.23 no.7
    • /
    • pp.913-918
    • /
    • 2013
  • The applicability of the ultrasonic wave method to the extraction of useful components from seaweeds was investigated. Extracts from freeze-dried Ecklonia cava powder were prepared with hot water ($65^{\circ}C$), water ($24^{\circ}C$), 50% ethanol, and 100% ethanol, and ultrasonic extraction was also performed. The content of phenolic compounds and the 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity and tyrosinase inhibitory activity of the extracts were analyzed, and differences in the data obtained by the ultrasonic extraction and the traditional extraction methods were compared. The phenolic content in the E. cava extract by ultrasonic extraction (142.80 mg/g) was approximately 14 times higher than the phenolic content in the hot water extract (10.03 mg/g). The DPPH radical scavenging and the tyrosinase inhibitory activities of the ultrasonic extract were approximately 4 times and 14 times higher than the hot water extracts, respectively. The correlation between the phenolic content and the DPPH radical scavenging activity ($R^2$=99.47) and between the phenolic content and the tyrosinase inhibitory activity ($R^2$=99.99) was very high. These results indicate that ultrasonic extraction is more suitable than traditional extraction for the extraction of useful components from E. cava.

Inhibitory Effect of DPPH Radical Scavenging Activity and Hydroxyl Radicals (OH) Activity of Hydrocotyle sibthorpioides Lamarck (피막이풀의 DPPH 라디칼과 hydroxyl radicals (OH) 항산화 활성 및 리폭시게나아제 저해 효과)

  • Cho, Kyung-Soon
    • Journal of Life Science
    • /
    • v.26 no.9
    • /
    • pp.1022-1026
    • /
    • 2016
  • In this study the hot water extract was prepared from Hydrocotyle sibthorpioides (Araliaceae) leaves and stems to study antioxidant activities and lipoxygenase inhibition. The extract showed the protective hydroxyl radical (-OH) which can damage virtually all types of macromolecules: carbohydrates, nucleic acids (mutations), lipids (lipid peroxidation), and amino acids. Hydroxyl radical scavenging activity of H. sibthorpioides was 78.6%. The extract showed strong activity against 1, 1- diphenyl 2-picrylhyorazyl (DPPH) which is a well-known radical and a trap (scavenger) for other radicals. DPPH scavenging activity of leaves of H. sibthorpioides was evaluated at 8.0 mg/ml was 86.0%. Lipoxygenases (LOXs) constitute a heterogeneous family of lipid peroxidizing enzymes capable of oxygenating polyunsaturated fatty acids to their corresponding hydroperoxy derivatives. The inhibitory effect of 15-LOX by H. sibthorpioides was assayed using a Morgan microplate assay. The extract of H. sibthorpioides was 55.5% inhibitory effects on the inhibition of LOX at 8.0 mg/ml. The IC50 values for OH activity, DPPH activity, and LOX inhibition from leaves 5.23 mg/ml, 6.44 mg/ml, and 3.71 mg/ml, respectively. Antioxidative activity assay showed that the water extracts from leaf and stem had a strong reducing power. These results show that H. sibthorpioides has some phytochemical constituents which may be active against the free radicals (OH and DPPH) and lipoxygenase enzyme.

Determination of Antioxidant Activity of Edible Calendula Flowers by Hot-air Drying Time (열풍건조 처리시간에 따른 식용꽃 금잔화의 항산화능 검정)

  • Oh, Sang Im;Kim, Seo Young;Lee, Ja Hee;Lee, Ae Kyung
    • FLOWER RESEARCH JOURNAL
    • /
    • v.26 no.4
    • /
    • pp.202-208
    • /
    • 2018
  • This experiment was conducted to determine optimal hot-air drying time for producing antioxidative calendula tea. The edible calendula was dried in hot air at $60^{\circ}C$ for 5, 10, 15 hours and Hunter's color value was measured and extracted with 95% ethanol as a solvent. The contents of total polyphenol, total flavonoid, total carotenoid and DPPH (2,2 Dipheny-1-picrylhydrazyl) radical scavenging activity were investigated. The correlation between the amount of antioxidant and antioxidant activity was analyzed. As the treatment time increased, the Hunter values of L, a, and b tended to decrease, and the L value and b value decreased significantly at 15 hours. The color change was occurred in all treatments compared with the control, and the total color difference (${\Delta}E$) was the largest at 15 hours treatment. The contents of total flavonoids, total carotenoids and DPPH scavenging activity increased in the 5 hours, but decreased in the 15 hours compared to the 10 hours. The content of total polyphenol was not changed with different treatment time. A positive correlation ($p{\leq}0.01$, r = 0.610) between carotenoids and DPPH radical scavenging activity was demonstrated. The DPPH radical scavenging activity was increased at 5 and 10 hours compared to the control and decreased at 15 hours. Therefore, 5 hours or 10 hours of treatment is appropriate and further studies are needed to determine the specific treatment time.

Investigation of DPPH Radical Scavenging and Pyolyl Endopeptidase Inhibitory Activities of Plant Extracts (천연 식물자원에서 DPPH 라디칼 제거능과 Prolyl Endopeptidase 활성 저해능 탐색)

  • Lee Young Min;Kim Dae Ik;Lee Sung Hyeon;Cho Soo Muk;Chun Hye Kyung;Park Hong Ju;Lee Yeon Sook
    • The Korean Journal of Community Living Science
    • /
    • v.16 no.4
    • /
    • pp.95-102
    • /
    • 2005
  • The present study was performed to investigate the 1,1-diphenyl-2-picryl hydrazyl (DPPH) radical scavenging and Proly1 endopeptidase (PEP) inhibitory activities of plant extracts. The whole extract of Fragaria yezoensis inhibited the DPPH radical by $90.4\%$ and the stem of Gingko biloba, Gardenia jasminoides for. grandiflora and Rhododendron yedoensa var. poukhanene, the loaves of Rhododendron mucronulatum var. ciliatum, Gardenia jasminoides for. grandiflora and Corylus sieboldiana var. mandshurice, the fruit of Cornus officinalis, and the root of Gingko biloba showed high DPPH radical scavenging activities. In the case of PEP inhibitory activities, high inhibition was observed in the whole Plant of Fragaria ananassa, Fragaria yezoensis and Hypericum erectum, the stem of Actinidia arguta and Rhododendron yedoensa var. poukhanese, the leaves of Rhododendron yedoensa var. poukhanense and Rosa davurica, the fruit of Cornus officinalis. and the root of Acer okamotoanum. There was significant correlation (P=0.000) between DPPH radical scavenging and prolyl endopeptidase inhibitory activities, thus some of plant extracts such as whole Fragaria yezoensis, fruit of Cornus officinalis had high activities in both DPPH-scavenging and prolyl endopeptidase inhibition. Therefore, it is required to examine the mechanical interaction between DPPH-scavenging and prolyl endopeptidase inhibitory activities and further studying plant extracts with both these activities is desired to develop agents for preventing and treating of Alzheimer's disease.

  • PDF

Antioxidative Compounds in Leaves of Castanea crenata S. et Z. (밤나무 잎으로부터 항산화 활성물질의 분리)

  • Choi, Yong-Hwa;Kim, Jin-Ho;Kim, Myong-Jo;Han, Seong-Soo;Rim, Yo-Seob
    • Korean Journal of Medicinal Crop Science
    • /
    • v.8 no.4
    • /
    • pp.373-377
    • /
    • 2000
  • Two antioxidative compounds in leaves of Castanea crenata were isolated by a bioassay using a DPPH free radical. They were identified as quercitrin, isoquercitrin on the basis of $^1H$ and $^{13}C-NMR$ and MS data. The DPPH radical scavenging activity $(RC_{50}\;:\;12\;{\mu}g)$ of two compounds was similar to that of ${\alpha}-tocopherol\;(12{\mu}g)$ and BHA $(14{\mu}g)$.

  • PDF

Radish(Raphanus sativus L. var. sativus) 추출물의 피부노화 저해효과

  • Kim, Ji-Eun;Hwang, Hyeon-Ik;Lee, In-Sun;Mun, Hye-Yeon
    • 한국생물공학회:학술대회논문집
    • /
    • /
    • pp.863-866
    • /
    • 2001
  • Antioxidative activites and anti skin aging effects of radish(Raphanus sativus L. var. sativus) extracts were studied. The DPPH(1,1-Diphenyl-2-picrylhydrazal) inhibitory effects and CAT(Catalase) activities of hydrophilic radish extracts(DPPH 81.0%, CAT 175units/mg) were significantly higher than lipophilic radish extracts(DPPH 50.0%, CAT 45unitg/mg). But, SOD(superoxide dismutase) activities of hydrophilic radish extracts(SOD 81.3%) were lower than lipophilic radish extracts(SOD 92.3%) In the Bovine Achilles Tendon collagen treated with hydrophilic radish extracts and lipophilic radish extracts, the pyridinoline concentration of collagen were decreased, respectively.

  • PDF

Quantification of Quercetin in Different Parts of Onion and Its DPPH Radical Scavenging and Antibacterial Activity

  • Kim, Su-Jeong;Kim, Gun-Hee
    • Food Science and Biotechnology
    • /
    • v.15 no.1
    • /
    • pp.39-43
    • /
    • 2006
  • Levels of quercetin in different parts of onion were investigated using high performance liquid chromatography (HPLC) and liquid chromatography mass spectrometry (LC/MS) suitable for use with functional food material. Two main peaks were observed on HPLC chromatograms from the extracts of the skin, and the outer, middle, and core parts of onion. Using LC/MS, peak 1 was tentatively identified as quercetin monoglucoside at m/z 466.4, and peak 2 as quercetin with [M]+ at m/z 303.3. The levels of quercetin in the skin, and the outer, middle and core parts of the plant were 16.83,2.67,0.95, and 0.35 mg/g, respectively. In the study of 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity, skin, the nonedible part, contained the highest amount of quercetin, compared to the other edible parts, and showed the highest DPPH radical scavenging activity. Levels of quercetin and DPPH radical scavenging activity increased from core to skin. All parts of onion exhibited the strongest antibacterial activity only against Staphylococcus aureus and Vibro parahaemolyticus. Antibacterial activities of onion exhibited that S. aureus was more sensitive than V. parahaemolyticus. Among the four onion extracts, the middle part showed the strongest inhibitory activity against S. aureus but all onion extracts showed similar antibacterial activities against V. parahaemolyticus.

Antioxidant Activity of Partially Purified Extracts Isolated from Bacillus polyfermenticus SCD Culture

  • Kim, Tae-Hoon;Lee, Na-Kyoung;Chang, Kyung-Hoon;Park, Eun-Ju;Choi, Shin-Yang;Paik, Hyun-Dong
    • Food Science and Biotechnology
    • /
    • v.15 no.3
    • /
    • pp.482-484
    • /
    • 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.

Effects of Yukmigeehwang-hwan Extracts on the Elastase Activity and DPPH and NO Scavenging Activities Original Articles (육미지황환(六味地黃丸)의 elastase 활성과 DPPH, NO 소거능에 미치는 영향)

  • Lee, Se-Na;Kim, Myung-Gyou;Kim, Myoung-Hee;Kim, Hyung-Jun;Jo, Hak-Jun;Leem, Kang-Hyun
    • Journal of Pharmacopuncture
    • /
    • v.14 no.1
    • /
    • pp.61-69
    • /
    • 2011
  • Objectives : Elastic fibers are found in the skin, lungs, arteries, veins and other structures. Elastases destroy the elastic fibers and cause the emphysema and pulmonary hypertension. Oxidative stress is needed for these pathologic changes. Accordingly, present study was designed to investigate the effect of Yukmigeehwang-hwan extracts (YHE) on elastase activity and anti-oxidative effects of YHE. Methods : The inhibitory effects on elastase and DPPH and NO free radical scavenging activities of YHE were measured. Results : The elastase activity was significantly inhibited by YHE. YHE significantly scavenged DPPH and NO free radicals as well. Conclusion : YHE showed the elastase-inhibiting effects and anti-oxidative activities in vitro. These results suggest that YHE may have potential roles in the treatment of pulmonary emphysema and pulmonary hypertension.