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Showing 1 to 20 of 50 for “"Aromatic amines"”.
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Aqueous reactions of ozone with primary aromatic amines
Ozone reacts readily with primary aromatic amines (aniline, 3-methylaniline, 3-chloroaniline, 4-bromoaniline, 4-nitroaniline) in dilute aqueous solutions (10$\sp{-5}$-10$\sp{-4}$ M). The major isolated reaction products identified by GC/MS were nitrosobenzenes, nitrobenzenes, azobenzenes, …
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Plant Activation of Bicyclic Aromatic Amines, Benzidine and 4-Aminobiphenyl
Bicyclic aromatic amines, benzidine and 4-aminobiphenyl (4-ABP) have been known as human bladder carcinogens and used in industrial manufacturing. Using the plant cell/microbe coincubation assay, this study showed that benzidine and 4-ABP were activated by plant peroxidase into frameshift- and base …
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Estimation of exposure to two potent heterocyclic aromatic amines in various human populations and their role in colorectal cancer
Thesis (Ph. D.)--Massachusetts Institute of Technology, Division of Toxicology, 1997.
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Cyclization of reactive carbonyls in foods upon processing: an origin for the formation of pyridine-derived flavours and heterocyclic aromatic amines
El procesado de alimentos genera tanto efectos positivos como negativos en los mismos. Estos efectos son consecuencia de las distintas reacciones producidas. Entre ellas, la formación de aminas heterocíclicas aromáticas (HAAs) tiene un gran interés debido a la toxicidad de estos compuestos. La …
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The plant-activation of m-phenylenediamine and its mutagenic, biochemical and molecular characterization
… into a mutagen by plant or animal systems. Many aromatic amines are promutagens and plants can activate these agents into stable mutagens. The biochemical and molecular mechanisms involved in bioactivation of promutagens into mutagens have been partially revealed in mammalian systems to …
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Retention trends of chemical classes using CCl₄ as a carrier solvent in normal-phase HPLC
… eleven chemical classes (furans, thiophenes, aromatic hydrocarbons, ethers, esters, ketones, aldehydes, aromatic amines, azaarenes, alcohols and phenols) on three analytical silica-bonded phase (amino (NH₂), cyano (CN) and polar amino-cyano (PAC)) columns were investigated with CCl₄ and …
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Modified alginates as a matrix for gene transfection in a HeLa cell model
… carbodiimide coupling method was used to couple aromatic amines to the carboxylic acid functional groups on the alginate backbone, thus giving it a cationic character. Diaminoacridine hydrochloride, thionin, basic fuchsin, acridine yellow and diaminomethyl triazine were the aromatic amines used. …
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Supercritical fluid chromatography of nitrogen-containing compounds on packed columns
… much better with propylamino column. Different aromatic amines and azaarenes were successfully separated on both analytical scale and microbore propylamino bonded phase packed columns with 100% supercritical CO₂. Separation is compared with both reversed phase and normal phase high performance …
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The liquid chromatography of aromatic diamines: analytical and preparative
… reactivity, and preparative separation of aromatic diamine isomers used in the synthesis of aromatic polyimides. Approximately 50 diamine isomers were separated on various silica gels using chloroform and/or cyclohexane mobile phases. A linear relationship between pK<sub>b</sub>, and log of …
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Comparison of transport effects of perfluorinated and hydrocarbon surfactants on environmental co-contaminants
… to the transport effects of HCSs. Polycyclic aromatic hydrocarbons, halogenated benzene compounds, and the BTEX series of compounds (benzene, toluene, ethylbenzene, and <italic>p</italic>–xylene) were used as representatives of important classes of hydrophobic neutral environmental …
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Michael addition of amines to α-ß unsaturated esters
<p>"The rate of Michael addition of primary amines to acrylates under different initial conditions was investigated. An acceptable agreement between different mathematical rate expressions was observed. The maximum rate was obtained in protic and polar solvents. The maximum temperature that …
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Characteristics and applications of the enhanced HRP-catalyzed oxidation of luminol
… the enhancers are halogenated phenols or aromatic amines. Unfortunately, only limited work has been done to characterize the action of these enhancers. The work reported to date has been empirical characterization of enhanced CL oxidations with regards to enhancer identity and …
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Monitoring for sulfonated azo dyes and their degradation products in industrial and municipal wastewater
… in cleavage of the azo bonds and formation of aromatic amines such as p-(2-hydroxyethylsulfone)-aniline, a reduction product of all three dyes. Some of these amines were unstable and quickly reacted to form other chemical structures. The textile mill effluent contained about thirty organic …
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Novel P,N-Ligand Stabilized Transition Metal Complexes as Efficient Catalysts for Organic Syntheses
… as potential catalysts for the N-alkylation of amines with alcohols. After optimization of the reaction conditions by systematic variation of important parameters such as solvents, bases or catalyst loadings the possible substrate scope of this method was demonstrated. The obtained results …
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Biological treatment and recycling of textile processing effluents
… biotreatment, due to the formation of toxic aromatic amines. The continuous culture bioprocess was also combined with membrane filtration technology to improve effluent treatment. Oecolourised, filtered effluents showed great reduction in COO, BODs and toxicity levels, and were found suitable …
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