• Title, Summary, Keyword: phloroglucinol

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In vitro Nutrient Digestibility, Gas Production and Tannin Metabolites of Acacia nilotica Pods in Goats

  • Barman, K.;Rai, S.N.
    • Asian-Australasian Journal of Animal Sciences
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    • v.21 no.1
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    • pp.59-65
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    • 2008
  • Six total mixed rations (TMR) containing 0, 4, 6, 8, 10, 12% tannin (TMR I-VI), using Accacia nilotica pods as a source of tannin, were used to study the effect of Acacia tannin on in vitro nutrient digestibility and gas production in goats. This study also investigated the degraded products of Acacia nilotica tannin in goat rumen liquor. Degraded products of tannins were identified using high performance liquid chromatography (HPLC) at different hours of incubation. In vitro digestibility of dry matter (IVDMD) and organic matter (IVOMD) were similar in TMR II, and I, but declined (p<0.05) thereafter to a stable pattern until the concentration of tannin was raised to 10%. In vitro crude protein digestibility (IVCPD) decreased (p<0.05) with increased levels of tannins in the total mixed rations. Crude protein digestibility was much more affected than digestibility of dry matter and organic matter. In vitro gas production (IVGP) was also reduced (p<0.05) with increased levels of tannins in the TMR during the first 24 h of incubation and tended to increase (p>0.05) during 24-48 h of incubation. Gallic acid, phloroglucinol, resorcinol and catechin were identified at different hours of incubation. Phloroglucinol and catechin were the major end products of tannin degradation while gallate and resorcinol were produced in traces. It is inferred that in vitro nutrient digestibility was reduced by metabolites of Acacia nilotica tannins and ruminal microbes of goat were capable of withstanding up to 4% tannin of Acacia nilotica pods in the TMR without affecting in vitro nutrient digestibility.

A Study on Sol-gel Preparation of Pt-Ru/C Anode Catalysts for Direct Methanol Fuel Cells (솔-젤 합성에 의한 직접 메탄올 연료전지용 고분산 Pt-Ru/C 음극 촉매의 제조)

  • Lee, Kang-Hee;Kim, Il-Gon;Park, Tae-Jin;Suh, Dong-Jin
    • Journal of the Korean Electrochemical Society
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    • v.6 no.1
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    • pp.13-17
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    • 2003
  • Cryogel and aerogel Pt-Ru/C were synthesized by the sol-gel process for the electrooxidation of methanol. From XRD analysis, it was found that the catalysts had highly dispersed Pt-Ru alloys on carbon support although high temperature treatments have been conducted. Electrocatalytic activities of 3 type aerogel catalysts were investigated in half cell experiments by cyclic voltammetry. Among them, Phloroglucinol-Formaldehyde(PF) type catalyst shows the highest activity. From the results of deactivation test for each catalysts, the aerogel catalysts are found to have excellent durability compared with those prepared by colloidal method.

Antioxidative Effectiveness of Terminalia chebula Rets Extracts (가자(Terminalia chebula Retz)추출물의 항산화 효과)

  • Jang, Sung Jun;Lee, Gee Dong;Kim, Jeong Sook;Yoon, Hyung Sik
    • Current Research on Agriculture and Life Sciences
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    • v.10
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    • pp.11-17
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    • 1992
  • In this study, antioxidative effectiveness of BHA, BHT at 0.02%(w/w) was compared with those of separated free phenolic acid, ester form and insoluble bound phenolic acid which were extracted from 50 g of Terminalia chebula Retz by MeOH/aceton solvents. Antioxidative effectiveness was measured by peroxide values and TBA values for 7 days, storaging respective substrates and contrast tube at $45{\pm}1^{\circ}C$ for 35days. Laboratory tubes was added by BHA, BHT, separated free, soluble and insoluble phenolic acid extracts and peroxide value of contrast tube after 21 day storage were 60, 30, 14, 11, 100. On the other hand, at the same conditions, TBA values of each antioxidants were 0.150, 0.108, 0.105, 0.073, 0.078, 0.185. This results remarkably appeared antioxidative effectiveness in meal soybean oil substrates. Phenolic acid separated and identificated were p-coumaric acid, Ferulic acid, Phloroglucinol, Pyrogallol, Vanillic acid and Caffeic acid.

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Identification of Biologically Active Substances from Ginkgo biloba L. (은행잎에 함유된 생리활성물질의 동정)

  • Nam, S.J.;Kim, K.U.;Shin, D.H.;Hwang, S.J.
    • Korean Journal of Weed Science
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    • v.17 no.4
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    • pp.421-430
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    • 1997
  • This experiment was conducted to detect the presence of allelopathic substances in the leaves of Ginkgo biloba L. Water extracts from G. biloba leaves which collected at different season markedly inhibited the germination and growth of O. sativa, E. crus-galli, D. sanguinalis, and L. sativa, indicating the presence of biological substances. Linolenic and palmitic acid were the major fatty acids of G. biloba leaves. The biochemical substances such as salicylic arid, p-coumaric acid, catechol, hydroquinone, orchinol, ferulic acid, phloroglucinol, and umbelliferone etc., belonging to the phenolic, compounds were, detected in a large amount, which may be responsible for exhibition inhibitory effects. The common phenolic compounds were detected in the early-harvested and late-harvested G. biloba leaves were salicylic and p-coumaric acid. All these compounds were related to the allelopathic activities in G. biloba leaves.

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Inhibition of Oxidative Damage by Phlorotannins from Ecklonia cava in Normal Human Dermal Fibroblasts

  • Kim, Moon-Moo;Rajapakseb, Niranjan;Kim, Se-Kwon
    • Journal of Marine Bioscience and Biotechnology
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    • v.1 no.2
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    • pp.126-135
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    • 2006
  • Phlorotannins which is oligomeric polyphenol of phloroglucinol unit were isolated from solvent fractions of methanolic extract of the brown alga, Ecklonia cava (EC). The inhibitory effects of phlorotannins from EC solvent fractions on oxidative stress were examined in human dermal fibroblasts (HDFs) related to wrinkle formation. Among the solvent fractions, phlorotannins from ethyl acetate fraction exerted the highest scavenging effect on DPPH radical, hydroxyl radical and alkyl radical analyzed by electron spin resonance (ESR) spectroscopy. The levels of intracellular reactive oxygen species (ROS) and lipid peroxidation were measured using 2',7'-dichlorofluorescin diacetate (DCFH-DA) and diphenyl-1-pyrenylphosphine (DPPP), respectively. Their levels were significantly decreased in the presence of phlorotannins from ethyl acetate fraction, compared with other fractions obtained from EC extract (P < 0.01). Furthermore, intracellular glutathione (GSH) level was significantly increased in a time dependent manner by the phlorotannins. Therefore, these results suggest that phlorotannins from EC extract could have a therapeutic potential for prevention and treatment of several diseases such as wrinkle formation related to oxidative stress.

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Chemical compositions of the sap of Acer mono MAX in Cheonnam region. (전남지역 고로쇠나무 수액의 성분분석)

  • 현규환;정현채;김준선
    • Korean Journal of Plant Resources
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    • v.12 no.3
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    • pp.215-220
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    • 1999
  • To find out the temporal and spatial variations in contents of sugar, phenolic compounds and mineral, the sap of Acer mono MAX. were harvested from several regions and periods, and those contents were determined by solvent fractionation, TLC, HPLC and atomic absorption spectrophotometer. Most of all the free sugar contained in the sap of Acer mono MAX. was sucrose, with range of 1.35 to 3.41%. The content of total phenolic compound in the sap of Acer mono MAX. was distributed from 0.034 to 0.151 mg/100m1, and most of phenolic acid was phloroglucinol. The contents of Na, K, Ca and Mg were ranged from 24.11 to 33.15, from 13.75 to 22.10, from 47.19 to 88.00 and from 2.48 to 6.31 ppm, respectively. Contents of sugar, phenolic compounds and mineral decreased sharply at the later harvest. Comparing two different methods of the sap harvest, bore method and groove method, the contents of compounds in the study were determined higher with groove method.

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Preparation and Properties of Self-Assembled Discotic Liquid Crystals Formed by Hydrogen Bonding (수소결합에 의한 자기조립된 원반형 액정의 제조와 특성)

  • Lee, Jun Hyup
    • Journal of Adhesion and Interface
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    • v.15 no.4
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    • pp.161-168
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    • 2014
  • New self-assembled discotic liquid crystals have been prepared through single hydrogen bonding between phenol and pyridine moieties, and their liquid crystalline properties were investigated. For the construction of discotic structure, we used phloroglucinol as a core molecule and trans-4-alkoxy-4'-stilbazoles with systematically varied alkyl chain lengths as peripheral units. FTIR results showed that the intermolecular hydrogen bonds between core and peripheral molecules are successfully formed, and the stability of the hydrogen bond is strongly influenced by molecular ordering. Discotic complexes exhibited different liquid crystalline phases depending on the length of alkyl chains around the discotic mesogen. The discotic complexes with longer alkyl chains showed hexagonal columnar mesophases, while the other complexes formed nematic columnar mesophases. These results indicated that the type of mesophase structure was strongly dependent on the alkyl chain length around the aromatic core.

Efficient Micropropagation of Pear Germplasm Using Soot Tips and Nodal Explants

  • Yi, JungYoon;Lee, GiAn;Chung, JongWook;Lee, YoungYi;Gwag, JaeGyun;Lee, SeokYoung
    • Korean Journal of Plant Resources
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    • v.28 no.6
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    • pp.690-696
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    • 2015
  • We micropropagated pear (Pyrus species) using shoot tips and nodal explants from three pear genotypes. The ability to establish shoot tip cultures, proliferate shoots, induce rooting, and acclimatize the resulting plantlets are all elements of in vitro micropropagation. Shoots were induced from shoot tips on Murashige and Skoog medium (MS) with five different plant growth regulator combinations. The highest shoot formation rates were achieved for the three genotypes using MS supplemented with 1.0 mg/L N6-benzyladenine (BA) and 0.1 mg/L gibberellic acid (GA3). The maximum shoot number and shoot length for the three cultivars were recorded with 2.0 mg/L BA and 0.2 mg/L indole-3-butyric acid (IBA) in multiplication medium using nodal explants produced from microshoots. Nodal explants with one or two axillary buds cultured for three weeks initiated roots on medium supplemented with various concentrations of 1-naphthaleneacetic acid (NAA) or/and IBA in half-strength MS medium for adventitious rooting. The highest rooting response was with the combination of 0.2 mg/L NAA and 0.2 mg/L IBA. A combination of NAA and IBA resulted in a significant increase in the rooting ratio over NAA or IBA alone. In this medium, the root formation rate according to ranged from 68.9% for the BaeYun No. 3 genotype to 51.8% for the Hwanggeum genotype. We also investigated the influence of the concentration the polyamine phloroglucinol in rooting medium. For all three genotypes, the highest rooting ratio, longest root length, and greatest root number were observed in the treatments with 75-150 mg/L phloroglucinol. Most rooted plants were acclimatized successfully.

Biological Activities of Phloroglucinols and Prenylated Flavonoids from Humuli Strobilus (홉의 주요 Phloroglucinol 및 Prenylated Flavonoid의 생물활성)

  • Kim, Hyun Jung;Yoon, Goo;Cho, Young Chang;Lee, Ik-Soo;Kang, Bok Yun
    • Korean Journal of Pharmacognosy
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    • v.49 no.3
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    • pp.189-202
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    • 2018
  • Hop cones (Humuli Strobili) are the female inflorescences of hop plants (Humulus lupulus L.) belonging to the family Cannabaceae. They have been used as herbal remedies to treat mood and sleep disturbances, and mainly to add as a bittering ingredient in brewing process. Considerable interests on pharmacological and biological activities of hop cones have been focused on their major constituents, namely, phloroglucinols (humulone, lupulone), terpenes (myrcene, humulene), and prenylated flavonoids (xanthohumol, isoxanthohumol, 6-prenylnaringenin, and 8-prenylnaringenin). The present review describes and discusses biological activity profiles of these major compounds in the hop cones.