• Title, Summary, Keyword: tannins

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Phenolic Compounds in Plant Foods: Chemistry and Health Benefits

  • Naczk, Marian;Shahidi, Fereidoon
    • Preventive Nutrition and Food Science
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    • v.8 no.2
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    • pp.200-218
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    • 2003
  • Phenolic compounds in food and plant materials belong to the simple phenols, phenolic acids, coumarins, flavonoids, stilbenes, tannins, lignans and lignins, all of which are considered as secondary plant metabolites. These compounds may be synthesized by plants during normal development or in response to stress conditions. Phenolics are not distributed uniformly in plants. Insoluble phenolics are components of cell walls while soluble ones are present in vacuoles. A cursory account of phenolics of cereals, beans, pulses, fruits, vegetables and oilseeds is provided in this overview. The information on the bioavailability and absorption of plant phenolics remains fragmentary and diverse. Pharmacological potentials of food phenolics ave extensively evaluated. However, there are many challenges that must be overcome in order to fully understand both the function of phenolics in plant as well as their health effects.

Hydrolyzable Tannins from the Fruits of Rubus coreanum (복분자 딸기 열매의 가수분해성 탄닌)

  • Pang, Keun-Cheol;Kim, Min-Son;Lee, Min-Won
    • Korean Journal of Pharmacognosy
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    • v.27 no.4
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    • pp.366-370
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    • 1996
  • Fruits of Rubus coreanum (Korean name: Bog-bun-ja) have been used in oriental traditional medicine as the remedies for impotence, pollution, premature ejaculation and frequency of urination etc. It is known to have phenolic compounds as an astringent. By means of chromatographic methods, four hydrolyzable tannins were isolated from the fruits of R. coreanum. The structures of these compounds were established as gallic acid, 2,3(S)-HHDP-D-glucopyranose, sanguiin H-4 and sanguiin H-6 on the basis of physicochemical and spectroscopic evidences.

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Hydrolysable Tannins and Related Compound having Cytotoxic Activity from the Fruits of Terminalia chebula

  • Lee, Seung-Ho;Ryu, Shi-Yong;Choi, Sang-Un;Lee, Chong-Ock;No, Zaesung;Kim, Seong-Kie;Ahn, Jong-Woong
    • Archives of Pharmacal Research
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    • v.18 no.2
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    • pp.118-120
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    • 1995
  • The cytotoxicity-directed fractionation of MeOH extract of Terminalia chebula fruits led to the isolation of three hydrolyzed tannins and a related compound, gallic acid(1), $1,2,3,4,6-penta-O-galloy-{\beta}-_D/-glucopyranose(II)$,. chebulagic acid (III) and chebulinic acid(IV), as active principles. They were shoen to exhibit moderate cytotoxicity against cultured human tumor cell lines including A-549, SK-OV-3, Sk-MEL-2, XF-498 and HCT-15 in vitro.

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Rapid Separation and Indentification Method of Tea Catechins (녹차 중 카테킨류의 신속 분리 및 동정법)

  • Lee, Jeong-Hee;Lee, Yong-Moon;Moon, Dong-Cheul
    • Analytical Science and Technology
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    • v.5 no.3
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    • pp.333-338
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    • 1992
  • The tea tannins, epigallocatechin, epigallocatechin gallate, were successfully separated by a Sephadex LH-20 column by the acetone based gradient elution. Each fractions was collected by monitoring at 280nm. Purified fractions were directly characterized by fast atom bombardment mass spectrometry. Epigallocatechin and epigallocatechin gallate were identified and shown as low as 70% purity in the reversed phase column. This revised method is more advantageous than known methods in purity and rapidity.

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Comparative Study of Processed (Shodhit) and Unprocessed Seeds of 'Gunja'-Abrus precatorius L.

  • Gautam, D.N. Singh;Singh, P.N.;Mehrotra, Shanta
    • Natural Product Sciences
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    • v.5 no.3
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    • pp.127-133
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    • 1999
  • 'Gunja' is attributable to the plant Abrus precatorius L. (Leguminosae). Three forms with red, brown and another with white seeds are known to occur in this species and are employed for different therapeutic uses viz. as purgative, emetic, aphrodisiac, tonic and also as an abortifacient. According to some Ayurvedic literature the seeds are poisonous and should be given to the patients after proper processing ('Shodhan'). A comparative study of various phytochemical parameters, namely, percentage of successive extractives, total proteins, tannins, total ash and acid insoluble ash of these three forms of the processed (with cow's milk and Kanji) and unprocessed seeds was done. TLC and densitometric scanning of successive extractives was also carried out to serve as markers for processed and unprocessed seeds. The percentage of proteins, tannins, alcohol and water soluble extractives decreased in the processed material. Besides, their acute toxicity, CNS activity were also studied in albino mice and it was found that white seeds are more toxic as compared to the red and brown. The toxic effect was reduced with the processing. Further, the 'Kanji' processed seeds are less toxic than the milk processed one.

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Antitumorigenic Effects of Tannin From Persimmon Leaves on Sarcoma 180-induced Tumor in Mice

  • Moon, Sung-Chai;Park, Kyong-Hee;Rhew, Tae-Hyong;Park, Kun-Young;Kim, Byeong-Gee
    • Preventive Nutrition and Food Science
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    • v.3 no.1
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    • pp.92-97
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    • 1998
  • The changes of morphology and protein pattern of sarcoma 180 cells treated with or without trannins extracted from persimmon leaves were evaluated by light microscopy, electrophoresis and Western blotting. The sarcoma 180 cells treated with tannins increased the amount of proteins which presumably were intermediate filament cytokeratins detected by electrophoresis and Western blot. Tannins was indirectly cytotoxic to the sarcoma 180 cells and increased the intermediate filament protein level in the cells.

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Hydrolysable Tannins from Cercidiphyllum japonicum Bark

  • Lee, Min-Sung;Min, Hee-Jeong;Si, Chuan-Ling;Bae, Young-Soo
    • Journal of the Korean Wood Science and Technology
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    • v.44 no.4
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    • pp.559-570
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    • 2016
  • The EtOAc and $H_2O$ soluble fractions of Katsura tree (Cercidiphyllum japonicum Sieb. Et Zucc) bark extracts were chromatographed on a Sephadex LH-20 column with various aqueous MeOH. Gallic acid (1), methyl galate (2), kurigalin (3), 1,2,3,6-tetra-O-galloyl-${\beta}$-D-glucose (4) and 1,2,3,4,6-penta-O-galloyl-${\beta}$-D-glucose (5) were isolated from EtOAc fraction. Isocorilagin (6) and methyl galate (2) were separated from $H_2O$ fraction. The structure determination was done by $^1H$ and $^{13}C$ NMR. Of these isolated compounds, methyl galate (2), kurigalin (3) and isocorilagin (6) were isolated, for the first time, from the bark extracts of Cercidiphyllum japonicum.

FICUS CARICA L.: A PANACEA OF NUTRITIONAL AND MEDICINAL BENEFITS

  • Salma, Salma;Shamsi, Yasmeen;Ansari, Saba;Nikhat, Sadia
    • CELLMED
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    • v.10 no.1
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    • pp.1.1-1.6
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    • 2020
  • Since times immemorial, people have been dependant on plants for the various nutritional and pharamacological properties. Folk and traditional medicine recognizes thousands of plant species having miraculous benefits. Fig (Ficus carica Linn.) has been part of folk-lore since centuries. Ficus carica Linn. (Moraceae) is a huge deciduous tree, with more than 800 species. Different parts of Ficus carica like bark, root, leaves, fruit and latex have their own valuable importance and are frequently used for the treatment of various illnesses. Fruit of Ficus carica is commonly called as fig (anjeer) has various medicinal properties used in Unani, Ayurvedic and Chinese traditional system of medicines. Fig fruit is mostly used in gastro intestinal and respiratory disorders. In Unani medicine, fig is used as a diuretic, mild laxative and expectorant. Phytochemical studies on the leaves and fruits of the plant have shown that they are rich in Phenolics, Flavonoids, Vitamin C, Alkaloids, Saponins, Coumarins, tannins, organic acids, and volatile compounds due to which it is having great antioxidant property. Most interesting therapeutic effects include hypoglycemic, hepatoprotective, anticancer, antimicrobial and hypolipidemic activities.

Chemical Composition, Degradation Characteristics and Effect of Tannin on Digestibility of Some Browse Species from Kenya Harvested during the Wet Season

  • Osuga, I.M.;Abdulrazak, S.A.;Ichinohe, T.;Fujihara, T.
    • Asian-Australasian Journal of Animal Sciences
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    • v.18 no.1
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    • pp.54-60
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    • 2005
  • A study was conducted with the objective of evaluating the nutritive value of some browse species from Kenya. The species evaluated included: Bauhinia alba, Bauhinia variegata, Bridelia micrantha, Calliandra calothyrsus, Carisa edulis, Cratylia argentea, Gliricidia sepium, Lantana camara, Maerua angolensis, Sesbania micrantha and S. sesban. The browses were evaluated by their chemical composition including phenolics, in vitro gas production and tannin activity (tannin bioassay). All the species had high crude protein content (149-268 g/kg DM) and low NDF content (239-549 g/kg DM). The feeds had varying contents of total extractable tannins (TET) ranging from low (3-22 mg/g DM), moderate (42-58 mg/g DM) and high (77-152 mg/g DM). Calliandra calothyrsus had the highest tannin content. Significant (p<0.05) variation in gas production was recorded among the species. Sesbania micrantha had the highest (p<0.05) potential gas production while Gliricidia sepium had the highest (p<0.05) rate of gas production. Use of polyethylene glycol (PEG 6000), to assess the adverse affect of tannins, indicated that tannins in browse species with high tannin content had inhibitory effects on rumen microbial fermentation as indicated by the gas production. Estimated organic matter digestibility and metabolizable energy also increased with PEG addition. The results of this study indicate that such Kenyan browse species have the potential to be used as feed supplements for ruminant animals.