• Title/Summary/Keyword: (-)-catechin

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Phenolic Compounds from Barks of Ulmus macrocarpa and Their Antioxidative Activities.

  • Kwon, Young-Min;Yeom, Seung-Hwan;Kim, Min-Ki;Lee, Jae-Hee;Lee, Min-Won
    • Proceedings of the PSK Conference
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    • 2002.10a
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    • pp.376.1-376.1
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    • 2002
  • Phytochemical examination of Barks of Ulmus macrocarpa isolated two flavanone, three flavanonol, three flavan 3-ol and one procyanidin compounds. We also determinated the antioxidative activity of these compounds by measuring the radical scavenging effect on 1, 1-diphenyl-2-picrylhydrazyl (DPPH) radicals. Three flavan 3-ol (catechin, epicatechin and catechin-7-O-$\beta$-O-xylopyranoside) and procyanidin B1 showed significant antioxidative activity. (omitted)

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Antioxidant activity of flavonoid, myricetin and (+)-catechin on B16F10 murine melanoma cell in oxidative stress with hydrogen peroxide

  • Yu, Ji-Sun;Kim, An-Keun
    • Proceedings of the PSK Conference
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    • 2003.04a
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    • pp.211.1-211.1
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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. Flavonoids. a group of polypenolic compounds, are widespread in the human food supply. This study was carried out to investigate the antioxidant activity of these compounds. myriceitn and (+)-catechin on B 16Fl0. murine melanoma cell line in oxidative stress. Oxidative stress was induced by exposure to hydrogen peroxide. (omitted)

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Content Analysis of Chungtaejeon Tea and Green Tea Produced in Jangheung District (장흥지역 청태전과 녹차의 성분분석)

  • Park, Yong-Seo;Lee, Mi-Kyung;Ryu, Hyeun-Hee;Heo, Buk-Gu
    • The Korean Journal of Community Living Science
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    • v.19 no.1
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    • pp.55-61
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    • 2008
  • This study was conducted to compare the nutrient and chemical contents of traditional Chungtaejeon tea with that of green tea which was harvested in Jangheung, Jeonnam district. Vitamin C, amino acids and total nitrogen contents of Chungtaejeon tea were lower than that of green tea by 0.30, 2.30 and 4.20g/100g, respectively. The tannin, caffeine, reducing sugar and chlorophyll contents in Chungtaejeon tea were the same as those in green tea. Comparing catechin contents, catechin (C), epicatechin (EC), and epigallocatechin (EGC) in Chungtaejeon tea were lower than those of green tea. However, gallocatechin (GC), epicatechin gallate (ECG), epigallocatechin gallate (EGCG) and catechin gallate (CG) showed no significant difference between Chungtaejeon tea and green tea. The flavonoid contents of Chungtaejeon tea and green tea showed higher quercetin and kaempferol contents in green tea, and higher myricetin content in Chungtaejeon tea. The measured amino acid contents for threonine and aspartic acid were lower, and for glutamic acid were higher in Chungtaejeon tea compared with those in green tea. However, free amino acid content in Chungtaejeon tea and green tea showed no significant difference. Potassium and magnesium contents in Chungtaejeon tea were lower compared to green tea but no significant difference was found for iron, manganese or calcium contents when comparing the two teas.

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Rutin, Catechin Derivatives, and Chemical Components of Tartary Buckwheat (Fagopyrum tataricum Gaertn.) Sprouts

  • Lee, Hee-Sun;Park, Cheol-Ho;Park, Byoung-Jae;Kwon, Soon-Mi;Chang, Kwang-Jin;Kim, Sun-Lim
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.51 no.spc1
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    • pp.277-282
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    • 2006
  • The aim of this study was to develop the tartary buckwheat (Fagopyrum tataricum Gaertn.) sprouts and to clarify the biological and chemical characteristics of the sprouts. At 7 days after seeding, hypocotyls length and thickness, and root length of tartary buckwheat sprouts were 137 cm, 1.4 mm, and 12.6 cm, respectively. Fresh weight, dry weight, and moisture contents of an individual sprout at 7 days after seeding were 202 mg, 5.4 mg, and 95.3%, respectively. Protein content in tartary buckwheat sprouts was 23.0% which relatively higher than that of seeds, while lipid and ash contents were 3.5% and 5.3%. Among 7 minerals, the content of phosphorus showed the highest level (1,383.5 mg/100 g), while the contents of sodium and potassium were 1,197.5 mg/100 g and 1,106 mg/100 g, respectively. The contents of other minerals were Mg (795.5 mg/100 g), Ca (149 mg/100 g), Zn (16.4 mg/ 100 g), and Fe (14.7 mg/100 g). The rutin content of tatary buckwheat sprouts including root parts was the highest (5644.9 mg/100 g) at 7 days after seeding. The concentration of catechin derivatives in tartary buckwheat sprouts was high in order of catechin (59 mg/100 g), epicatechin gallate (47 mg/100 g), and epicatechin (14 mg/100 g).

Antioxidant and Synergist Effect of Extract Isolated from Commercial Green, Oolong and Black Tea (시판 녹차, 홍차, 오룡차의 항산화 및 상승효과)

  • 이호선;손종연
    • The Korean Journal of Food And Nutrition
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    • v.15 no.4
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    • pp.377-381
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    • 2002
  • The antioxidative effect of tea extracts from green tea, oolong tea and black tea was investigated. The extraction yields of crude catechin were green tea 5.4%, oolong tea 3.5%, and black tea 2.5%. Green tea, oolong tea and black tea of crude catechin showed antioxident activity at concentrations of 200ppm, and the oolong tea showed highest antioxidant effect. The browning intensities(at 420 nm) of green, oolong and black tea were 0.140, 0.582 and 0.915, respectively and green tea showed highest hydrogen donating ability(HDA) and than followed by oolong or black tea. Also, when the crude catechin(100 ppm) was used in combination with ${\alpha}$-tocopherol(50 ppm) and ascorbyl palmitate(50 ppm), the crude cathechin showed very strong synergistic effect, comparable to that of crude catechin(200 ppm).

Effects of aging on the phenolics content and antioxidant activities of rose flower (Rosa hybrida L.) extracts (숙성조건이 장미꽃 추출물의 페놀화합물(phenolics) 함량과 산화방지 활성에 미치는 영향)

  • Kim, Soyoung;Ko, Seung Hyun;Yoon, Hyungeun
    • Korean Journal of Food Science and Technology
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    • v.49 no.6
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    • pp.714-716
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    • 2017
  • Rose flower is widely used in the preparation of tea and contains a large variety of phytochemicals, including phenolics such as catechin, quercetin, and rutin. The effects of aging on rose (Rosa hybrida L.) flower extracts (RFE) were examined under conditions of varying temperature and relative humidity. The total phenolic content, antioxidative activity, and catechin levels were measured to evaluate the effects of temperature and relative humidity on the aging process. Performing the aging process at $30^{\circ}C$ under 60% or 90% relative humidity for 24 h significantly increased the total phenolic content and the antioxidant activities of RFE (p<0.05). Additionally, an aging process performed at $30^{\circ}C$ and 60% relative humidity for 24 h maximized the extraction rate of phenolics such as catechin and consequently led to increased antioxidative activity of RFE. In summary, this study indicates that the extraction rate of physiologically active phenolic compounds in rose flower can be increased by performing an aging process under optimized temperature and relative humidity conditions.

Effects of Flavonoids and a-Tocopherol on the Oxidation of n-3 Polyunsaturated Fatty Acids -2. Antioxdizing Effect of Catechin and a-Tocopherol in Rats with Chemically Induced Lipid Peroxidation- (n-3 고도 불포화 지방산의 산화억제에 미치는 플라보노이드와 a-토코페롤의 효과 -2. 지질과산화를 촉진시킨 흰 쥐의 체내지질의 산화 억제 효과-)

  • BYUN Dae-Seok;KWON Mi-Na;HONG Jeong-Hwa;JEONG Dong-Yoon
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.27 no.2
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    • pp.166-172
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    • 1994
  • To evalulate the antioxidant effect of flavonoid(+)-catechin on n-3 polyunsaturated fatty acids in vivo, rats were fed with diets containing $5\%$ corn oil(CO), $5\%$ corn oil and $15\%$ purified fresh fish oil(FO) or peroxidized fish oil(PFO) for 10 days. To accerelate lipid peroxidation, all of them were injected with 60mg phenobarbital(a day per kg body weight), and treated with phorone(diisopropylidene acetone) before the rats were killed. Contents of triglyceride, phospholipid, cholesterol and lipid peroxide and the activities of GOT, GPT in serum and total lipid and cholesterol content in liver of PFO group rats were significantly higher than those of the FO one. Contrary to our expectations, the activities of superoxide dismutase (SOD), catalase and glutathione peroxidase(GSH-Px) in liver of the FO group were ]ewer than those of the PFO group. These results might be explained as the results of homeostasis. Even though the hepatic glutathione were depleted, catechin and a-tocopherol inhibited production of lipid peroxide effectively. These results suggested that catechin be considered an antioxidative and hepatoprotective agent.

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DPPH Radical Scavenging Activity of Phenolic Compounds Isolated from the Stem Wood of Acer tegmentosum (산겨릅나무 목질부에서 분리한 페놀성 화합물의 DPPH 라디칼 소거활성)

  • Kwon, Dong-Joo;Kim, Jin-Kyu;Bae, Young-Soo
    • Journal of the Korean Wood Science and Technology
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    • v.39 no.1
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    • pp.104-112
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    • 2011
  • There have been few reports on the constituents and biological activity of stem bark of $Acer$ $tegmentosum$, and no phytochemical and biological studies have been reported for stem wood of $A.$ $tegmentosum$. Two flavan 3-ols (1 and 2), three phenolic acid/alcohols (3~5), and two coumarins (6 and 7) were isolated from the stem wood of $A.$ $tegmentosum$ by repeated column chromatography. The structure of isolated compounds were identified as (+)-catechin (1), (-)-epicatechin (2), $p$-hydroxybenzaldehyde (3), syringic alcohol (4), $p$-tyrosol (5), scopoletin (6), and cleomiscosin A (7) on the basis of spectroscopic evidences such as $^1H$-NMR, $^{13}C$-NMR, 2D-NMR and MS spectrum. $p$-Hydroxybenzaldehyde (3), syringic alcohol (4), scopoletin (6), and cleomiscosin A (7) have not been reported from this plant so far. (+)-Catechin (1) and (-)-epicatechin (2) showed the higher 1, 1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity than butylated hydroxyanisole (BHA) used as a positive control.

Antioxidative Activity of Flavonoids Isolated from Jindalrae Flowers (Rhododendron mucronulatum Turcz.) (진달래꽃으로부터 분리된 플라보노이드 화합물의 항산화성에 관한 연구)

  • Kim, Mi-Ae;Jones, A. Daniel;Chung, Tae-Yung
    • Applied Biological Chemistry
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    • v.39 no.4
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    • pp.320-326
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    • 1996
  • Seven antioxidative flavonoids were isolated from Jindalrae flowers (Rhododendron mnonulatum Turcz.), an edible plant in Korea. These compounds were identified as afzelin, ampelopsin, catechin, myricetin, myricitrin, quercetin and quercitrin on the basis of IR, UV, FAB-MS, $^1H\;NMR,\;and\;^{13}C\;NMR$ data. These compounds were consisted of two flavonols, three flavonol glycosides, a flavane, and a dihydroflavonol. The flavonol glycosides (14.4 g) present in th ethyl ether and ethyl acetate fractions comprised up to 82% of their total flavonoid amount (17.6 g) finally recovered by means of polyamide C-200 column chromatography, preparative TLC, recrystallization, and Sephadex LH-20 column chromatography. The antioxidant activities were measured in an ethanol solution of linoleic acid in the presence of ferric thiocyanate. The antioxidant efficiency increased in the order of afzrlin<$\alpha-tocopherol$

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