• Title, Summary, Keyword: phloroglucinol

Search Result 63, Processing Time 0.033 seconds

An Antifungal Subatance, 2,4-Diacetylphloroglucinol Produced from Antagonistic Bacterium Pseudo-monas fluorescens 2112 Against Phytophthora capsici (Phytophthora capsici를 길항하는 Pseudononas fluorescens 2112가 생산하는 항진균 항생물질 2,4-diacetylphloroglucinol)

  • 이은탁;김상달
    • Microbiology and Biotechnology Letters
    • /
    • v.29 no.1
    • /
    • pp.37-42
    • /
    • 2001
  • An antifungal substance was purified from culture broth of Pseudomonas flulorescens 2112 that showed a broad-spectrum antagonistic activity against various phytopathogenic fungi including capsici. The substance was identified as 2,4-diacetylphloro-glucinol basd on NMR analysis. The 2,4-diacetylphloroglcinol showed antibiotic activity in broad acidic range from pH 1.0 to pH 9.0. About 83% of initial activity was remained after incubation for 30min ar $60^{\circ}C$, however, the activity was dropped up to 50% after 30 min incubation in $80^{\circ}C$. When the nucleotides of P. capsici treated with 2,4-diacetylphloroglucinol were labeled with[$^{3}$ H]-Adenin, the newly synthesized and radioactive-labeled RNA was significantly reduced than those of untreated P. capsici. indicating that the 2,4-diacetylphloroglucinol inhibits RNA synthesis.

  • PDF

Screening of the Antioxidant Defense Systems from Parthenocisuss tricuspidata PLANCH (담쟁이덩굴의 항산화 방어계의 탐색)

  • 정형진;김충현
    • Korean Journal of Plant Resources
    • /
    • v.14 no.2
    • /
    • pp.116-123
    • /
    • 2001
  • The non-enzymatic antioxidants and antioxidant enzyme from the extracts of Parthenocissus tricuspidata PLANCH. were examined in order to utilize natural product for cerchemopreventive agents. The antioxidant potential and enzyme activities on plant positions in the extracts of Parthenocisuss tricuspidata PLANCH. showed considerable differences. The antioxidant activity of the leaf extracts by Ethyl acetate fractions of Parthenocisuss tricuspidata PLANCH. was the highest among three positions ($7.57\mu\textrm{g}/m\ell$). The highest activities showed in S-5 (in leaf), S-4 (in stem) and S-3 (in root) fraction by Silicagel column chromatography and the antioxidant activity showed, in purified extract of each positions, $7.06\mu\textrm{g}/m\ell$ (in leaf), $6.99\mu\textrm{g}/m\ell$ (in stem) and $12.39\mu\textrm{g}/m\ell$ (in root) respectively. The activities of DPPH by LH-20 column chromatography revealed much higher than those by silica-gel column chromatography. These were identified as the phenolic compounds known as antioxidant compounds such as Benzoic acid(Gallic acid), 1-methyl-3-(2-phenylethen) benzene, phloroglucinol and 1,2-dihydroxy-4-(1-propyl)benzene by GC/MS. POD activities in the stem and root were higher than in the leaf. SOD activity was highest in the leaf, stem and root activity was comparatively low. Especially, SOD activity in leaf was over 2 times higher than root.

  • PDF

Synthesis and Photopolymerization of Discotic Liquid Crystals Containing Hydrogen Bondings and Two Polymerizable Groups (두 종류의 중합기와 수소결합을 가지는 원반형 액정의 합성과 광중합)

  • Lee Jun-Hyup;Lee Seung-Jun;Jang Ji-Sun;Jho Jae-Young
    • Polymer Korea
    • /
    • v.30 no.5
    • /
    • pp.373-379
    • /
    • 2006
  • Polymerizable discotic liquid crystals containing diacetylene and acryloyl groups were formed through hydrogen bonding between phloroglucinol core and polymerizable pyridine derivatives, and their photopolymerization behavior was investigated. The discotic complexes exhibited discotic columnar and rectangular columnar mesophases depending on the number of aromatic rings. Photopolymerization of the discotic complexes was carried out by UV irradiation in the liquid crystalline state. IR and UV-Vis spectroscopy affirmed that diacetylene and acryloyl groups were selectively Polymerized, and that crosslinked polymers containing short conjugated diacetylene oligomers were produced by 1,4-addition. X-ray diffraction experiment showed that the columnar order in the discotic complex containing phenyl-pyridine moiety was maintained after photopolymerization, and that the rectangular columnar order in he discotic Complex with biphenyl units was changed to the lamellar order.