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Tadashi Uemura - One of the best experts on this subject based on the ideXlab platform.
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Vapor Pressures of the Ethylamine + Water + Lithium Bromide System and Ethylamine + Water + Lithium Nitrate System
Journal of Chemical & Engineering Data, 1998Co-Authors: Shigeki Iyoki, Hisashi Gouda, Shin-ichi Ootsuka, Tadashi UemuraAbstract:Vapor pressures of the Ethylamine + water + lithium bromide (H2O:LiBr = 2:1 mass) system and the Ethylamine + water + lithium nitrate (H2O:LiNO3 = 2:1 mass) system were measured by a boiling point method at temperatures from 296.25 K to 318.25 K and at Ethylamine concentrations from 4.8 to 59.4 mass %, and at temperatures from 296.35 K to 316.25 K and at Ethylamine concentrations from 4.8 to 64.0 mass %, respectively. The experimental vapor pressure data for these ternary systems were fitted to an Antoine-type equation. The calculated values from these equations for vapor pressures of two ternary systems were in good agreement with the experimental vapor pressure data.
Antonia M. Calafat - One of the best experts on this subject based on the ideXlab platform.
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Quantitative determination of the hydrolysis products of nitrogen mustards in human urine by liquid chromatographyelectrospray ionization tandem mass spectrometry
2016Co-Authors: Sharon W Lemire, David L Ashley, Antonia M. CalafatAbstract:Nitrogen mustards are a public health concern because of their extreme vesicant properties and the possible exposure of workers during the destruction of chemical stockpiles. A sensitive, rapid, accurate, and precise analysis for the quantitation of ultratrace levels of N.ethyldiethanolamine (EDEA) and N-methyldiethanolamine (MDEA) in human urine as a means of assessing recent exposure to the nitrogen mustards bis(2-chloroethyl)Ethylamine and bis(2-chloroethyl)mEthylamine, respectively, was developed. The method was based on solid-phase extraction, followed by analysis of the urine extract using isotope-dilution high-performance liquid chromatography-mass spectrometry with TurbolonSpray ~ ionization and multiple-reaction monitoring. The method limits of detection were 0.41 ng/ml, for EDEA and 0.96 ng/ml, for MDEA in I mt of urine with coefficients of variation < 10 % for both compounds
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quantitative determination of the hydrolysis products of nitrogen mustards in human urine by liquid chromatography electrospray ionization tandem mass spectrometry
Journal of Analytical Toxicology, 2003Co-Authors: Sharon W Lemire, David L Ashley, Antonia M. CalafatAbstract:Nitrogen mustards are a public health concern because of their extreme vesicant properties and the possible exposure of workers during the destruction of chemical stockpiles. A sensitive, rapid, accurate, and precise analysis for the quantitation of ultratrace levels of N.ethyldiethanolamine (EDEA) and N-methyldiethanolamine (MDEA) in human urine as a means of assessing recent exposure to the nitrogen mustards bis(2-chloroethyl)Ethylamine and bis(2-chloroethyl)mEthylamine, respectively, was developed. The method was based on solid-phase extraction, followed by analysis of the urine extract using isotope-dilution high-performance liquid chromatography-mass spectrometry with TurbolonSpray ~ ionization and multiplereaction monitoring. The method limits of detection were 0.41 ng/ml, for EDEA and 0.96 ng/ml, for MDEA in I mt of urine with coefficients of variation < 10% for both compounds.
Jianyi Shen - One of the best experts on this subject based on the ideXlab platform.
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Effect of Ethylamines on the Hydrogenation of Toluene over Supported Nickel Catalysts
Industrial & Engineering Chemistry Research, 2018Co-Authors: Jingxuan Cai, Li Zuo, Chang Hao, Jianyi ShenAbstract:Highly loaded and dispersed catalysts 60%Ni/Al2O3, 60%Ni/MgO, and 60%Ni/MgAlO were used to study the effect of monoEthylamine (MEA), diEthylamine (DEA), and triEthylamine (TEA) on the hydrogenation of toluene. It was found that the heats and coverages for the adsorption of toluene and hydrogen decreased greatly after the preadsorption of an Ethylamine, and thus the existence of Ethylamines inhibited significantly the conversion of toluene on Ni. However, such effect was weakened over Ni supported on the basic supports (MgAlO and MgO). In addition, all the three Ethylamines were strongly adsorbed on Ni, but with different coverages of MEA > DEA > TEA, which was the same sequence as the effect of Ethylamines on the hydrogenation of toluene. Particularly, the Ni/MgAlO was the most active among the catalysts studied for the hydrogenation of toluene with Ethylamines and thus might be a good choice for the hydrogenation of aromatic rings in aromatic amines.
M V Morenoarribas - One of the best experts on this subject based on the ideXlab platform.
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biogenic amine content of red spanish wines comparison of a direct elisa and an hplc method for the determination of histamine in wines
Food Research International, 2005Co-Authors: Angela Marcobal, M C Polo, P J Martinalvarez, M V MorenoarribasAbstract:Biogenic amines were determined in 61 commercial red Spanish wines from various winemaking areas and elaborated with different vinification/ageing procedures. Biogenic amines (histamine, mEthylamine, Ethylamine, tyramine, phenylEthylamine, putrescine and cadaverine) analysis was carried out by RP-HPLC with o-phthaldialdehyde precolumn derivatization and fluorescence detection. Overall, histamine and putrescine were the most prevalent amines, being present in 75% and 71%, respectively, of the wines, followed by tyramine (56% of the wines). There were no significant differences between biogenic amine levels and ageing characteristics of the wines tested. Moreover, it was found that amines suspected to cause toxicological effects (histamine, tyramine and phenylEthylamine) are no cause for concern in these Spanish wines as they are present in amounts well below the limit considered as physiological. A commercial competitive direct ELISA immunoassay method specific for the detection of histamine has also tested on these wines and the results were compared with the RP-HPLC method. Both methods showed a good agreement for histamine analysis of wines.
Paiman Bawon - One of the best experts on this subject based on the ideXlab platform.
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Reducing formaldehyde emission of urea formaldehyde-bonded particleboard by addition of amines as formaldehyde scavenger
Building and Environment, 2018Co-Authors: Aizat Ghani, Zaidon Ashaari, Paiman BawonAbstract:Abstract Particleboard is one of the building materials that contribute to the emittance of formaldehyde in enclosed area. In order to reduce the formaldehyde emission from particleboard, amines were added into the urea formaldehyde (UF) resin as formaldehyde scavenger. The amines used were mEthylamine, Ethylamine and propylamine. 0.5, 0.7 and 1% of each type of amine were added into UF resin and the mixtures were used to produce particleboard from rubberwood particles. The properties of the UF resin after addition of amines such as gelation time, viscosity, pH, free formaldehyde content and thermal stability were evaluated. The physical, mechanical properties and formaldehyde emission of the produced boards were also assessed. The results revealed that fully cured amine-containing UF resin possesses higher thermal stability compared to control UF resin. Amine-containing UF resin also had longer gelation time due to higher pH value. Nevertheless, both physical and mechanical properties of the resultant particleboard were negatively affected. Particleboard made from amine-containing UF resin had higher thickness swelling and water absorption. In addition, lower bending strength and internal bonding strength were also recorded. Insufficient pressing time for fully cured of resin might be the reason for such phenomenon. Particleboard with F*** emission level (0.5 ≤ x ≤ 1.5 mg/L) as specified in Japanese Industrial Standard (JIS) or European's E0 class equivalent were achieved when Ethylamine and propylamine were added, regardless of dosage used. This study showed the feasibility of using amines as formaldehyde scavenger. However, optimisation of processing parameters is needed to enhance the physico-mechanical properties of the particleboard.