• Title/Summary/Keyword: trimethylamine

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Semiconductor Sensor for Detecting Freshness of Sea Foods (생선의 신선도 측정을 위한 반도체 센서)

  • Bak, Sung-Hyun;Kwon, Tae-Ha
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.29 no.4
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    • pp.272-278
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    • 1993
  • The trimethylamine-sensing characteristics of ZnO based thin film semiconductors and the sensitivity enhancement by squttering conditions have been investigated to develop a new type sensor for detecting fish freshness. The sensor fabricated with a 300nm of ZnO thin film with 4 wt% Al sub(2) O sub(3) and 1 wt% TiO sub(2) exhibited the highest sensitivity of 155 at 30$0^{\circ}C$ of working temperature and to the 240 ppm TMA gas. Deposition of ZnO thin film using a RF magnetron sputter was carried out at a pressure of 10 super(-2) Torr in pure oxygen gas with an RF power of 100W. The sensor exhibited a large response to the actual gases produced by a mackerel at an early stage of decomposition.

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Ligand Binding energy of CdS/ZnS various interfaces: ab-initio study intimately related with anisotropic CdS/ZnS quantum rod growth

  • Jeong, Incheol
    • Proceeding of EDISON Challenge
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    • 2015.03a
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    • pp.292-295
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    • 2015
  • The effect of Ligand Binding energy in quantum rod (CdS/ZnS) plays a critical role in anisotropic growth. As mimicking large chain of ligands and using the head of the chain, I plan to bind the quantum rod and ligands so that it can grow well consequently. So the ultimate goal of this study is on how ligand binding can affect the growth of this quantum rod. There are preferred surfaces between the quantum rod and ligands, and we empirically know that ligands which bind the quantum rod; Phosphoric oxide (PO), Phosphoric acid(PA), Carboxylic acid(CA), Trimethylamine(TMA), have strong tendency to be attached on the surfaces of CdS/ZnS; ($11{\bar{2}}0$), ($10{\bar{1}}0$), ($000{\bar{1}}$), (0001). I virtually bond the surface and the ligands, and calculated the ligand binding energy after optimizing their structure, utilizing EDISON simulator. After all, I figured out how they are linked each other and how the quantum rod grows.

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Photocatalyst Effect of Polyester Fabrics Treated with Visible-light Responsive Photocatalyst

  • Choi, Sei Young
    • Elastomers and Composites
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    • v.51 no.1
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    • pp.31-37
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    • 2016
  • In this study, we studied the photocatalytic functionality such as deodorant, antibacterial, antistatic of polyester fabrics treated with visible-light responsive photocatalyst. According to UV/visible spectrometry result, the UV-visible peak of visible-light responsive photocatalyst was found to be red shift at 420 nm sensitive in the visible light region. Also, the deodorizing and antimicrobial performance were shown to be retained more than 99% both before washing and even after 25 times washing. According to washing durability of polyester fabrics treated with visible-light responsive photocatalyst, the reduction effects for gas such as ammonia, trimethylamine, formaldehyde and toluene after 25 times washing appeared to be retained as much as before washing. At both before washing and after 25 times washing, antistatic property showed frictional voltage of approximately 250V.

A Convenient Synthesis of Polycyclic γ-Lactams via Pauson-Khand Reaction

  • Kang, Seok-Won;Kim, Yong-Hoon;Kim, Hea-Jeong;Lee, Joo-Hee;Kim, Sung-Hoon
    • Bulletin of the Korean Chemical Society
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    • v.30 no.3
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    • pp.691-694
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    • 2009
  • Pauson-Khand reaction of hydroxyenynes with $Co_2(CO)_8$ in the presence of N-methylmorpholine N-oxide or trimethylamine N-oxide as a promoter produced polycyclic $gamma$-lactams as single stereoisomers in moderate to excellent yield. These are the first examples of an intramolecular Pauson-Khand reaction on a hydroxyenyne system tethered to a three- and four-membered ring as new skeletons with 5,6,5 fused ring systems.

Quality Evaluation of Commercial Salted and Fermented Anchoby Sauce (시판 멸치액젓의 품질평가 방법에 관한 연구)

  • 김재현;류기형;안현주;이경행;이현자;변명우
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.29 no.5
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    • pp.837-842
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    • 2000
  • Commercially distributed salted and fermented anchovy sauces in Korea were purchased from six different companies. Microbiological, chemical, rheological and sensory analyses were carried out to evaluate the quality and safety and to provide basic information of the products. The salinity of every product was lower than of regulatory standard. All samples tested had acceptable in moisture content and pH. However, wide range of amino nitrogen (AN), volatile basic nitrogen(AN), volatile basic nitrogen (VBN), and trimethylamine (TMA) contents were observed. One product among tested had lower level of AN than regulatory standard. Pathogenic microorganisms were also detected from the samples, therefore sanitation procedure will be needed to ensure safety. From the results, AN, VBN, and viscosity were highly correlated to sensory scores, suggesting that these values can utilized as a standard method to evaluate quality of the salted and fermented anchovy sauce.

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Synthesis, Reactions and Catalytic Activities of Water Soluble Rhodium and Iridium-Sulfonated Triphenylphosphine Complexes. 1. Polymerization of Terminal Alkynes

  • 주광석;김상열;진종식
    • Bulletin of the Korean Chemical Society
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    • v.18 no.12
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    • pp.1296-1301
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    • 1997
  • Polymerization of terminal alkynes (phenlacetylene and 4-ethynyltoluene) catalyzed by water soluble rhodium (Ⅰ) complex, RhCl(CO)(TPPTS)2 (TPPTS=m-P(C6H4SO3Na)3) (1) selectively produces cis-transoid polymers at room temperature in homogeneous solution of H2O and MeOH as well as in biphasic solutions of H2O and CHCl3. The rate of polymerization is higher in H2O/MeOH than in H2O/CHCl3. The iridium analog, IrCl(CO)(TPPTS)2 (2) shows catalytic activity for the polymerization of phenylacetylene only at elevated temperature to give trans-polymers. The polymerization rate increases significantly when the trimethylamine N-oxide (Me3NO) was added to the reaction mixtures. The electronic absorption spectra of the cis-transoid polymers show three absorption bands whereas the trasn-polymers show only one absorption band. It seems that the electronic absorption bands depend on the configuration of the polymers.

Endovascular Closure Resolves Trimethylaminuria Caused by Congenital Portosystemic Shunts

  • Ponce-Dorrego, Mar?a Dolores;Garzon-Moll, Gonzalo
    • Pediatric Gastroenterology, Hepatology & Nutrition
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    • v.22 no.6
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    • pp.588-593
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    • 2019
  • This study aimed to report three new cases of an association between two rare conditions, congenital portosystemic shunts (CPSS) and trimethylaminuria (TMAU), and the efficacy of endovascular closure of the CPSS for resolving TMAU. Between November 2014 and April 2017, 15 patients with CPSS were enrolled in this prospective study to assess the efficacy of percutaneous endovascular shunt closure. Three patients presented with clinical symptoms of TMAU that were confirmed by urine analysis of trimethylamine (TMA) and TMA n-oxide. One year after endovascular closure of the congenital portosystemic shunt, the same parameters were evaluated were obtained and the values were compared to the pretreatment values. The results indicated the disappearance of clinical symptoms of TMAU and normalization of the urine test parameters in two patients and no changes in one patient, who developed new portosystemic communications.

Simultaneous determination of low molecular weight amines and quaternary ammonium ions by IC/ESI-MS

  • Jung, Joo-Young;Park, Han-Seok;Kim, Kang-Jin
    • Analytical Science and Technology
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    • v.20 no.3
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    • pp.255-260
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    • 2007
  • A new method for the simultaneous determination of low molecular weight amines and quaternary ammonium ions based on the separation by IC with a suppressor and the detection by MS with ESI has been developed. The method has been applied to the analysis of a mixture containing tetramethylammonium ion, tetraethylammonium ion, tetrapropylammonium ion, triethanolamine, trimethylamine and triethylamine. The constituents were separated by isocratic elution using an IonPac CS17 column, a cation-exchange column, and detected by conductivity and mass spectrometry. The newly developed method for the six components demonstrated that the repeatability in terms of relative standard deviation for three measurements was in the range of 0.1-0.5 %. The detection limits were between 0.2 and $0.9{\mu}g/mL$ by the IC/ESI-MS.

Removal Efficiency of the Deodorization Equipment and Characteristics of Malodor during the Process in Co-treatment of Sewage and Food Waste of Su-young Wastewater Treatment Plant in Busan (부산수영하수처리장 하수와 음식물쓰레기 병합처리 시 공정별 악취특성 및 후처리시설 효율평가)

  • Lee, Hyung-Don;Kang, Dae-Jong;Lee, Min-Ho;Kang, Dong-Hyo;Oh, Kwang-Joong
    • Clean Technology
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    • v.18 no.4
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    • pp.379-389
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    • 2012
  • Environmental issues are being paid more attention due to income growth, urban overcrowding, and population growth in Korea. Among the various environmental problems, odor damage is the one of the serious factors. To take example for food waste combination treatment in Su-young wastewater treatment plant in Busan, many complaints occurred because this plant locate around residential areas. The purpose of this work is not only to analyze odorous elements and their contributions but also to evaluate odor quotient (OQ), sum of odor quotient (SOQ), and treatment efficiency of bio-filter. The results of dilution sensory test of complex odor, grinder, leachate, hopper indicated higher order complex odors happen in July and August. The main odorous elements consisted of hydrogen sulfide, ammonia, methly mercaptan and acetaldehyde, which were analyzed by instrumental detection method, and methyl mercaptan was exceeded over 3,571 times of threshold. In addition, result of contribution of odor was methyl mercaptan (49.95 to 59.08%), hydrogen sulfide (20.43 to 29.27%), trimethylamine (8.82 to 13.42%) and acetaldehyde (9.17 to 11.35%). Other facilities were compared with the contribution of the odor using OQ and SOQ during the process. Sulfur compounds, acetaldehyde, and trimethylamine are high contribution of odor using OQ as well as odor intensity of grinding process is highest. As a result, sulfur compounds (e.g., methyl mercaptan and hydrogen sulfide) are highest for OQ and SOQ of grinding process is highest as 7,067. The removal efficiency of deodorization equipment was more than 90.00% in ammonia and amines, but the average efficiency of sulfur compounds was 53.51%. Thus, this facility is more higher contribution of acetaldehyde and trimethylamine than other treatment facilities. And food waste treatment in environmental area needs to consider appropriate capacity and refers to other bio-filter operating conditions.

Evaluations on Deodorization Effect and Anti-oral Microbial Activity of Essential Oil from Pinus koraiensis (잣나무 정유의 소취효과 및 구강균에 대한 항균활성 평가)

  • Hwang, Hyun Jung;Yu, Jung-Sik;Lee, Ha Yeon;Kwon, Dong-Joo;Han, Woong;Heo, Seong-Il;Kim, Sun Young
    • Korean Journal of Plant Resources
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    • v.27 no.1
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    • pp.1-10
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    • 2014
  • Essential oils of various plants have been known for potential biological effects such as antibacterial, antifungal, spasmolytic, antiplasmodial activities and insect-repellent property. Recently, the essential oils have attracted considerable interest in oral disease therapy. This essential oil has been known as being effective on easing sick house syndrome, giving forest aroma therapy effect and acting as repellent against pest. The essential oil of Pinus koraiensi, a native plant from Hongcheon-gun, Gangwon-do, was obtained by hydrodistillation. In light of its medicinal importance, in this study its composition, antibacterial activity and the reducing effect of offensive odor have been analyzed. The composition of essential oil was determined by GC and GC-MS. We have identified 14 compounds, of which 1R-${\alpha}$-pinene (19.38 %), 3-carene (10.21 %), camphene (9.82 %), limonene (9.00 %), bicyclo[2,2,1] heptan-2-ol (8.76 %) and ${\beta}$-phellandrene (7.98 %) were the main components. Essential oils from P. koraiensis, Chamaecyparis obtusa, Abies holophylla and Pinus densiflora were compared in terms of alleviating effect of malodors caused from formaldehyde, ammonia, trimethylamine and methylmercaptan. P. koraiensis essential oil was found to decrease the amounts of ammonia and trimethylamine by 75.17 % and 77.36 %, respectively. Antibacterial activity against Streptococcus mutans and Streptococcus sobrinus, which were known as oral cavity inducer, was investigated using the paper disc agar diffusion method. The inhibition zone was observed against S. mutans (5.97 mm) and S. sobrinus (1.40 mm), respectively. P. koraiensis essential oil shown effective deodorization and inhibitory activity against oral cavity in this study might be potential material in oral sanitary industry.