The analysis of the constituents of fingerprints has been described numerous times, mainly with the purpose of determining the aging effect on fingerprints or showing the differences between donors or groups of donors. In this paper we describe the use of derivatized amino acids to determine the...

New chiral precolumn reagents, (+)- and (−)-1-(9-anthryl)-2-propyl chloroformate (APOC), are introduced for the chiral separation of amino acids and small peptides in capillary electrophoresis. Chiral separation of 17 amino acids and four small peptides as their diastereomeric 1-(9-anthryl)-2-pr...

In the current study, quantitative structure-retention relationships (QSRR) were constructed based on data obtained by a LC–(ESI)-QTOF-MS/MS method for the determination of amino acid analogues, following their derivatization via chloroformate esters. Molecules were derivatized via n-propyl chl...

Vapor–liquid equilibria (VLE) for the n-hexane + 2-isopropoxyethanol and n-heptane + 2-isopropoxyethanol (at 60, 80, and 100 kPa) systems were measured. Two systems present positive deviations from ideal behavior. And the system n-heptane + 2-isopropoxyethanol shows a minimum boiling azeotrope ...

Infinite dilution activity coefficients (γ∞) were measured at 298 K for 9 different aliphatic hydrocarbons (alkanes, cycloalkanes, alkenes), 7 different aromatic compounds (benzene, alkylbenzenes, halobenzenes), and for 1,2-dichloropropane, dichloromethane, acetone, acetonitrile, tetrahydrofur...

A new on-line solid phase preconcentration method using an ion-imprinted polymer with restrict access material based on copper-imprinted poly(allylthiourea) modified with 2-hydroxyethyl methacrylate and bovine serum (IIP-HEMA-BSA) to preconcentrate Cu2+ ions and exclude protein from milk samples...

N-allylthiourea chitosan (ATUCS), a chelating material, was prepared, characterized, and studied for the removal of arsenazo III (As (III)) dye from aqueous solution. Scanning electron microscopy (SEM), energy-dispersive X-ray (EDX), Fourier transform infrared (FTIR) spectroscopy, X-ray diffract...

Simultaneous measurements of density and sound speed, at five temperatures, T = (283.15 to 303.15) K and over the whole composition range were performed in 38 aqueous mixtures of 2-(isopropylamino)ethanol (IPAE), a sterically hindered amine of new generation with potential use in CO2 capture. Co...

3-dimethylaminopropylamine (DMAPA) and glycine (GLY) mixture was studied as a potential absorbent for carbon dioxide (CO2) capture and utilization. The solubility of CO2 in aqueous GLY-DMAPA solutions within the range of 0.1–2.0 mol/L (M) were measured experimentally using pressure differential...

SummaryA method for the specific estimation of methylamine, ethylamine, orn-propylamine in biological fluids is described. The oxidation of the amine by a purified amine dehydrogenase from Pseudomonas AMI is coupled by phenazine methosulfate to the reduction of 2,6-dichlorophenolindophenol which...

The sequential treatment of 3-nitro-2-quinolones with amines and N-halosuccinimides under mild conditions facilitated the direct amino-halogenation and aziridination at the 4- and 3-positions of the 2-quinolone framework. The selectivity of the functionalization was influenced by the electronic ...

The syntheses of the new compounds: 5-(2-chloropropyl)-[1,3,5]-dithiazinane (1), 3,5-di-(2-chloropropyl)-[1,3,5]-thiadiazinane (2) and 1,3,5-tri-(2-chloropropyl)-[1,3,5]-triazinane (3) and their N-borane adducts 1(BH3), 2(BH3)2 and 3(BH3)2 are reported. The heterocyclohexanes are derived from th...

The synthesis, spectroscopic study and X-ray structural data of two different isomers of [copper(II)1,8-bis(N,N-dimethylcarbamoylmethyl)-4,11-dimethyl-1,4,8,11-tetraazacyclotetradecane] (BF4)2 are reported. This study clearly shows that the two complexes are of I and trans-III configurations, re...

The reaction of 4-methyl-pyrrolidin-2-ones, chlorinated at the C(3) and C(6) positions, with n-propylamine constitutes a new method for the preparation of 5-propylimino-pyrrolidin-2-ones or 3-pyrrolin-2-ones in generally good yields. The transformation involves a series of eliminations, substitu...

Reaction of 2-chloro-2-acetimidoylbutyrolactones with sodium methoxide or sodium ethoxide in the corresponding alcohol provides a facile one-step synthesis of methyl or ethyl 1-alkyl-2-methylpyrrole-3-carboxylates from readily available starting materials.

This paper reports the synthesis and characterization of azo functional poly(isobutyl vinyl ether) oligomers and block copolymers containing poly(isobutyl vinyl ether) and oligoesterdiol segments. Isobutyl vinyl ether was polymerized using a trifluoromethanesulfonic acid/tetrahydrothiophene init...

Chemical surface modification of aluminum oxide (AO) nanoparticles with graft copolymer of AO and poly(isobutyl vinyl ether) (PIBVE) (AO-graft-PIBVE) was carried out by ball milling of AO nanoparticles with IBVE in vacuum at low temperature. The AO-graft-PIBVE was evidenced by FT-IR and 1H NMR s...

The surface modification of microcrystalline cellulose (MCC) powder with poly(isobutyl vinyl ether) (PIBVE) chains of block copolymers of MCC and PIVBE (MCC-block-PIBVE) was produced by ball milling of MCC with isobutyl vinyl ether (IBVE) in vacuum at 77 K. The polymerization of IBVE was initiat...

With acrylic acid, butyl acrylate and methyl methacrylate as the monomers, acrylate modified vinyl chloride and vinyl isobutyl ether copolymers were prepared by solution polymerization. Firstly, vinyl chloride and vinyl isobutyl ether copolymers were grafted with acrylic monomers to obtain a pro...

The application of living cationic polymerization suffers from complex and costly additives as well as low productivity. In this work, we attempted to develop fast living cationic polymerization of isobutyl vinyl ether (IBVE) tailored by reduced single nucleophile in microflow system. Living pol...