• Title, Summary, Keyword: Hydroxylamine

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Synthesis and Antibacterial Activity of Novel 5-(heteroaryl)isoxazole Derivatives (5-(Heteroaryl)isoxazole계 화합물의 합성 및 항균 활성)

  • RamaRao, R. Janaki;Rao, A.K.S. Bhujanga;Sreenivas, N.;Kumar, B. Suneel;Murthy, Y. L. N.
    • Journal of the Korean Chemical Society
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    • v.55 no.2
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    • pp.243-250
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    • 2011
  • The synthesis, characterization and antibacterial activity of novel isoxazole derivatives were reported. 3-Di (alkylamino)acryloalkanones were prepared and used as synthons to get the target isoxazole derivatives via reaction with hydroxylamine hydrochloride or hydroxylamine-O-sulphonic acid.

Enhancement of Hydroxylamine Reactivity of Bacteriorhodopsin at High Temperature

  • Sonoyama, Masashi;Mitaku, Shigeki
    • Journal of Photoscience
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    • v.9 no.2
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    • pp.299-301
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    • 2002
  • Recent denaturation experiments of bacteriorhodopsin (bR) in the dark and under illumination at high temperatures revealed that irreversible thermal bleaching occurs above ~ 70°C and the preceding reversible structural changes in the dark above 60°C are closely related to irreversible photobleaching observed in the same temperature range (Yokoyama et al. (2002). J Biochem. 131,785). In this study, structural properties of bacteriorhodopsin (bR) at high temperatures were extensively probed by hydroxylamine reactivity with the Schiff base in the dark and hydrogen-deuterium (H-D) exchange in the peptide groups. In the Arrhenius plot from kinetics measurements of the hydroxylamine reaction, a good linear relationship between the reaction time constant and the inverse of the absolute temperature was observed below 60°C, while significant increase started above 60°C, suggesting that remarkable increase in water accessibility of the Schiff base in the temperature region. FT-IR spectroscopic studies on the H-D exchange suggested increase in the deuterium exchanges rate of the peptide hydrogen in the same temperature region.

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Characteristic Reactions in Anaerobic Nitrogen Removal from Piggery Waste (돈사폐수의 혐기성 질소제거공정에서 일어나는 특이반응)

  • Hwang, In-Su;Min, Kyung-Sok
    • Journal of Korean Society of Environmental Engineers
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    • v.28 no.3
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    • pp.300-307
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    • 2006
  • Anaerobic ammonium oxidation(ANAMMOX) is a novel process fur treatment of piggery waste with strong nitrogen. In this study, we investigated acid fermentation of organic matter, denitrificatiot reduction of sulfur compounds and P crystalization by hydroxyapatite during the treatment of wastewater with high strength of ammonium and organic matters by ANAMMOX process. Also, functions of hydroxylamine and hydrazine as intermedeates of ANAMMOX process were tested. This study reveals that various complex-reactions with anaerobic ammonium oxidation of piggery waste are happened and hydroxylamine and hydrazine play an important role in ANAMMOX reaction.

The Adsorption Mechanism of Copper (II) Ion on Acrylic Fiber Treated with Hydroxylamine (하이드록실 아민으로 처리한 아크릴섬유의 구리 (II)이온의 흡착기구)

  • Chin Young-gil;Choi Suk-chul
    • Journal of the Korean Society of Clothing and Textiles
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    • v.12 no.1
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    • pp.27-35
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    • 1988
  • In order to investigate a practical application of the fibrous adsorbent to heavy metal ions, acrylic fibers were treated with the hydroxylamine solution that was producted by hydroxylamine hydrochloride and potasium hydroxide in a condition of strong alkaline and $70^{\circ}C$. The adsorption mechanism of copper(2) ion on the fibrous adsorbent, that is hydroxylaminated acrylic fibers, was studied. The adsorption of copper(2) ion was explained in terms of the activated adsorption that are formed the complex with the ligand, such as C=N, N-H, NHOH, on the surface of the adsorbent. The activation energy was evaluated to be 3.8 Kcal/mol. and the times of adsorption equilibrium was approximately 10 minutes. The uptake of copper(2) ion was found to be effected with the increase of temperatures and the pH dependence.

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Hydroxylamine Effect on the Determination of Dissolved Oxygen by the Azide-Modified Winkler Method and Polarography (修正된 아자이드 Winkler 법과 폴라로그래피에 의한 溶存酸素의 측정에 관한 하이드록실아민의 영향)

  • Chung, Keun Ho;Ree, Jony Iuir;Kim, Chun Seek
    • Journal of Environmental Health Sciences
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    • v.12 no.2
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    • pp.11-15
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    • 1986
  • Hydroxlamine effect on the determination of dissolved oxygen by the azide-modified Winkder method and polarography has been studied. It was found that hydroxylamine interference on the dissolved oxygen by the azide-modified Winklet method can be eliminated completely by using permanganate. An inexpensive and convenient polarograph device was constructed. Dissolved oxygen in an air-saturated 0.1 F KCl solution undergoes, independent of hydroxylamine concentrations a two-step irreversible reduction at the dropping electrode the $H_2O_2$ produced in the first step is reduced to $H_2$O in the second. Two waves of equal size result, the first with a half-wave potential (E1/2) at about -0.13 V and the second at about -0.91 V (vs. SCE).

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A Study on the Spectrophotometric Analysis of Pyruvic Acid (Pyruvic Acid의 분광학적 정량법에 관한 연구)

  • 최윤수;조경열;석경순
    • YAKHAK HOEJI
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    • v.29 no.3
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    • pp.117-123
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    • 1985
  • A clorimetric determination method of pyruvic acid using hydroxylamine was studied. Hydroxylamine was reacted with pyruvic acid to form complex compound in the presence of Cu(II) ion. Optimal conditions for the quantitative analysis were investigated and the structure of complex was examined spectrometrically. The molar ratio (2:1) and the stability constant ($1.88{\times}10^{4}$) of the complex were measured. It was the characteristic feature of this method that the commonly encountered interfering substances such as fructose, glucose and lactic acid do not infuence the measurement of pyruvic acid.

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Mechanism of the Reduction of Nitrobenzene in Basic Solution (염기성 용액에서 니트로벤젠의 환원 메카니즘에 대한 고찰)

  • In Kyu Kim;Jasoo Whang
    • Journal of the Korean Chemical Society
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    • v.20 no.1
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    • pp.56-58
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    • 1976
  • A new mechanism is proposed for the reduction of nitrobenzene in basic solution that does not involve hydroxylamine as an intermediate. This paper presents evidence that the azoxybenzene is not formed from the hydroxylamine, but formed instead from the dimerization of nitrosobenzene.

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Design and Performance Evaluation of Ionic Liquid Propellant Thruster (이온성 액체 추진제 추력기 설계 및 성능 평가)

  • Kang, Shin-Jae;Lee, Jeong-Sub;Kwon, Se-Jin
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.645-648
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    • 2011
  • Hydrazine which has been used as monopropellant shows high performance, but because of its high toxicity research for new green propellant that could replace hydrazine is going on. Ionic liquid propellant that is one of the green propellant has lower toxicity, higher specific impulse, and higher density than hydrazine. To design the thruster which use Hydroxylamine Nitrate (HAN), one of ionic liquid propellant, as a propellant, a quantity of catalyst for full decomposition of a propellant is needed. In this study, reference point for HAN thruster design could be suggested through a design of a small scale thruster which used HAN propellant, and propellant decomposition capability evaluation with characteristic velocity efficiency.

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New Synthetic Method of Aminophosphonic Acid via Amination of Organoboranes (유기 붕소 화합물의 아민화 반응을 이용한 Aminophosphonic Acid의 새로운 합성방법)

  • Kim, Sang Beom;Jo, Gyeong Yeon;Hong, Seok In
    • Journal of the Korean Chemical Society
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    • v.38 no.9
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    • pp.682-686
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    • 1994
  • New synthetic method of aminophosphonic acids by the amination of organoboranes containing phosphorus was developed. Thus, the hydroboration of diethyl 2-propenylphosphonate, diethyl 2-methyl-2-propenyl-phosphonate, diethyl 3-butenylphosphonate with borane-THF, followed by amination of the resulting organoboranes with hydroxylamine-O-sulfonic acid gave diethyl 3-aminopropylphosphonate, diethyl 3-amino-2-methyl-2-propylphosphonate and diethyl 4-aminobutylphosphonate, respectively. 3-Aminopropylphosphonic acid and 4-aminobutylphosphonic, acid were obtained by the hydrolysis of the corresponding esters, respectively.

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