• Title/Summary/Keyword: 포피린

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Studies on the Catalytic Effects of Organic Compounds by Polymer-bonded Metalloporphyrins (고분자 결합 Metalloporphyrin을 이용한 유기물질의 산화촉매에 대한 연구)

  • Lee Sung-Ju;Paeng Ki-Jung;Whang Kyu-Ja
    • Journal of the Korean Chemical Society
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    • v.36 no.5
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    • pp.744-752
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    • 1992
  • Polymer bonded metalloporphyrins are synthesized by reaction between Fe(III) protoporphyrin or Mn(II) tetrakis(4-N-carboxyphenyl)porphyrin with polystyrene divinylbenzene copolymer. The spectroscopic properties of synthetic polymer bonded metalloporphyrins are investigated by using resonance Raman spectrometer. By synthetic polymer bonded metalloporphyrins as catalyst, which are model of cytochrome P-450 and peroxidases, epoxidation of olefins and oxidation of alkanes are achieved with H2O2 as oxidant. The catalytic efficiencies with polymer bonded metalloporphyrins are improved on that with corresponding nonpolymer bonded metalloporphyrins. Especially those can be reused because of stability against oxidant. Electron donating imidazole derivatives, which are attached in 5th position of central metal of metalloporphyrins, enhance the catalytic efficiencies.

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Reduction of Nitrotoluenes and Simultaneous Removal of Hydrogen Sulfide and Nitrotoluenes by Co3+-centered Hematoporphyrin (포피린의 촉매작용에 의한 니트로톨루엔의 환원 및 니트로톨루엔과 황화수소의 동시 제거)

  • Cho, Jeong-Guk;Kang, An-Soo
    • Applied Chemistry for Engineering
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    • v.5 no.1
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    • pp.37-43
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    • 1994
  • Mononitrotoluenes were reduced to aminotoluenes using porphyrin as a catalyst in the presence of several types of reductants including hydrogen sulfide and 1, 4-dithiothreitol(DTT). Intermediates and final products of porphyrin-catalyzed reduction of mononitrotoluenes were identified and a pathway for the reduction of the nitro group to the corresponding amino group was proposed. The optimum pH for the reduction was determined. The catalytic activity of the porphyrin was confirmed by UV/VIS absorption spectra and basic kinetics of porphyrin-catalyzed reduction were studied. Of several types of reductants tested, DTT sodium hydrosulfite, and hydrogen sulfide were seen to give significant reduction of nitrobodies. When hydrogen sulfide was used as a reductant hydrogen sulfide and nitrotoluenes were removed simultaneously.

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Metalloporphyrin Catalyzed Olefin Epoxidation and Molecular Orbital Study (Metalloporphyrin의 Olefin Epoxidation과 분자궤도함수론적 고찰)

  • Hwhan Jin Yeo;Hyun Chun Sin
    • Journal of the Korean Chemical Society
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    • v.36 no.4
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    • pp.558-564
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    • 1992
  • Product yields were determined for the reaction of styrene with sodium hypochlorite (NaOCl) in CH$_2$Cl$_2$ with various substituted manganese porphyrin complexes as catalysts. In the presence of the electron withdrawing group and ortho-substituted manganese porphyrin complexes, reaction rate and epoxide selectivity are increased. Also reaction rate and epoxide selectivity are largely increased by the presence of imidazole which behaves as axial ligand of the manganese porphyrin complexes. By the kinetic study with Michealis-Menten equation, the factor significantly affected to catalytic ability is $K_m$ value. A large binding affinity consists with the low $K_m$. With theoretical analysis by EHMO calculation, the results are in good agreement with experimental data.

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Inhibition of Cholesterolesterase by Porphyrin Complexes (포르피린 화합물을 이용한 콜레스테롤에스테르 가수분해효소 억제반응)

  • Lee, Bong Ho;Lee, Chang Yeol;Yu, Jong Wan;Yu, Byung Soo
    • Journal of the Korean Chemical Society
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    • v.42 no.3
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    • pp.302-305
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    • 1998
  • The high cholesterol level in the blood stream is the main cause for cardiovascular diseases. Despite considerable worldwide effort to reduce the blood cholesterol level, we still need a remarkable drug. For this reason, the inhibition of cholesterolesterase by synthetic porphyrin complexes was investigated. Some of the phenyl substituted porphyrins inhibited the enzyme and the inhibition constant was in the range of ${\mu}M$. The substituents on the phenyl group of tetraphenylporphyrin did not affect much on the inhibition constant.

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Development of Dental Calculus Diagnosis System using Fluorescence Detection (형광 검출을 이용한 치석 진단 시스템 개발)

  • Jang, Seon-Hui;Lee, Young-Rim;Lee, Woo-Cheol
    • The Journal of the Korea institute of electronic communication sciences
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    • v.17 no.4
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    • pp.715-722
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    • 2022
  • If you don't regularly go to the dentist to check your teeth, it is difficult to notice cavities or various diseases of your teeth until you have pain or discomfort. Dental plaque is produced by the combination of food or foreign substances and bacteria in the mouth. Starch breaks down from the bacteria that form tartar. The acid that occurs at this time melts the enamel of the teeth and becomes a cavity. So tartar management is important. Poppyrin, the metabolism of bacteria in the mouth, reacts at 405 nm wavelengths and becomes red fluorescent, which can be seen by imaging through certain wavelength filters. By the above method, Frag and tartar are fluorescently detected and photographed with a yellow series of filters that pass wavelengths of 500 nm or more. It uses MATLAB to detect and display red fluorescence through image processing. Using the difference in voltage between normal teeth and tartar through an optical measuring circuit, it was connected to an Arduino and displayed on the LCD. This allows the user to know the presence and location of dental plaque more accurately.

Abatement Study of TNT Wastes by Porphyrin-Metal Complexes (포피린-메탈 복합체를 이용한 TNT 폐수의 처리)

  • 조정국;우인성
    • Journal of the Korean Society of Safety
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    • v.8 no.4
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    • pp.127-132
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    • 1993
  • Porphyrin-catalyzed reduction of TNT to triaminotoluene was performed in both batch reactions and a continuous process. Packed-bed reactors were used to study porphyrin-catalyzed reduction in a continuous process. A reactor was packed with DEAD(diethylaminoethyl)-substituted glass beads on which $Co^{+3}$_centered deuteroporpgyrin Ⅸ, -2, 4-disulfonic acid was immobilized, and another containing only DEAE glass beads was used as a control. The porphyrin exhibited catalytic activity in its immobilized state up to 100 hours of operation. Based on the successful abatement of nitrobodies by porphyrin-catalyzed reduction in both batch and continuous process, this process is recommended to be used as a pretreatment for biological treatment or carbon adsorption treatment of TNT wastes.

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Fabrication of Oxygen Sensitive Particles and Characteristic Analysis (산소감응성 입자 제조 및 특성 분석 연구)

  • Jeong, Won-Taek;Yi, Seung-Jae;Kim, Hyun-Dong;Kim, Kyung-Chun
    • Journal of the Korean Society of Visualization
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    • v.9 no.4
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    • pp.41-46
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    • 2011
  • Oxygen sensitive functional particles(OSParticle) were fabricated by three different methods for using the particles as oxygen sensors and PIV tracers. The used methods were a physical coating method, an ion-exchange method and a dispersion polymerization method. The physical coating method is dipping $SiO_2$ hollow particles into dye solution then drying. This method is very simple, but particles are not uniform in diameter and luminescence. The particles fabricated by the ion-exchange method have very uniform diameter and well doped. However, it can not be used in water since the particles are hydrophobic. In case of the dispersion polymerization method, the diameter of OSParticles is quite uniform. The diameter of OSParticles can be changed by controlling the quantity of AIBN (2,2'-azobis isobutyronitrile). For the purpose of dissolved oxygen concentration measurement in micro scale water flows, the dispersion polymerized OSParticles turn out to be the most superior functional particles. The luminescent intensity of OSParticles was tested with the variation of dissolved oxygen concentration in water samples. As a result, the luminescent intensity of OSParticles is monotonically decreased with increasing DO (Dissolved oxygen) concentration of water.

Molecular Oxygen in Solid State of Polymeric Tetraphenylporphinatocobalt(II) (고분자로 지지된 코발트(II) 테트라페닐포피린 화합물에서의 산소분자에 관한 연구)

  • Chae Hee Kwon;Chong Soo Han;Hakze Chon
    • Journal of the Korean Chemical Society
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    • v.28 no.2
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    • pp.114-120
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    • 1984
  • The reversible oxygenation of a solid stae polymeric cobalt(II) porphyrin complex, PVP-CoTPP was studied at 0, -24 and $-78^{\circ}C$. When PVP-CoTPP was contacted with $O_2 $at$-78^{\circ}C$ the oxygen uptake increased with oxygen partial pressure. At about 700mmHg $O_2$, the amount of oxygen taken up corresponded approximately one oxygen molecule to one Co(II) complex. The amount of $O_2$ taken up by PVP-CoTPP decreased with increasing temperature. When $16O_2$ was admitted to the Co(II) complex a EPR signal corresponding to $O_2^-$ increased with a decrease in Co(II) signal. The results suggest that an electron is transfered from Co(II) in PVP-CoTPP to oxygen forming a $Co(III)-O_2^-$ complex where $O_2^- $is superoxide type.

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