A colorimetric determination of aromatic primary amines by chloranil
نویسندگان
چکیده
منابع مشابه
Identification and Analysis of the Migration of Primary Aromatic Amines from Flexible Food Packaging by High-performance Liquid Chromatography (HPLC)
Background and Objectives: Primary Aromatic Amines (PAAs) are contaminants that can migrate from food flexible packaging. The main origin of these compounds is polyurethane adhesives used in the laminating process of multilayer films. Residual aromatic di-isocyanates of the reaction of adhesive polymerization migrate into the food, and are hydrolyzed to PAAs by the moisture of food. 2,4- and 2,...
متن کاملPreparation of sterically congested 1,3,4-oxadiazole derivatives from N-isocyaniminotriphenylphosphorane, aromatic acids, cyclopentanone and primary amines
Reactions of N-isocyaniminotriphenylphosphorane with cyclopentanone have been studied in the presence of aromatic carboxylic acids and primary amines, proceeds smoothly at room temperature under neutral conditions to afford sterically congested 1,3,4-oxadiazole derivatives by an intramolecular Aza-Wittig cyclization in CH2Cl2 in excellent yields. The structures of the products were deduced from...
متن کاملDetermination of primary aromatic amines in cold water extract of coloured paper napkin samples by liquid chromatography-tandem mass spectrometry
The aim of this study was the optimisation of a multi-analyte method for the analysis of primary aromatic amines (PAAs) from napkins in order to support official controls and food safety. We developed a UHPLC-MS/MS method for the simultaneous determination of 36 toxicologically relevant PAAs for paper and board. Good regression coefficients of the calibration curves in a range of 0.992-0.999 an...
متن کاملVisible spectrophotometric method for the determination of some typical aromatic primary amines by using p-N, N-Dimethylphenylenediamine and iodine
p-N,N-dimethyl phenylene diamine(DMPD) is oxidized with Iodine into p-N,N-dimehylbenzoquinonemonoimine which can form a purple –red charge –transfer complex with aromatic primary amine (APA) at pH 3.0 . The absorbance of the p-N,Ndimehylbenzoquinonemonoimine – APA charge-transfer complex is measured at 520nm. This proposed method is simple, rapid and sensitive with reasonable precision and accu...
متن کاملSpecific determination of 20 primary aromatic amines in aqueous food simulants by liquid chromatography-electrospray ionization-tandem mass spectrometry.
A multi-analyte method without any pre-treatment steps using reversed-phase liquid chromatography-electrospray ionization-tandem mass spectrometry (LC-ESI-MS/MS) was developed and applied for the determination of 20 primary aromatic amines (PAA) associated with polyurethane (PUR) products or azo-colours. The method was validated in-house for water and 3% acetic acid food simulants using spiked ...
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ژورنال
عنوان ژورنال: BUNSEKI KAGAKU
سال: 1970
ISSN: 0525-1931
DOI: 10.2116/bunsekikagaku.19.43