112429

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A sensitive and efficient method for trace analysis of some phenolic compounds using simultaneous derivatization and air-assisted liquid-liquid microextraction from human urine and plasma samples followed by gas chromatography-nitrogen phosphorous detection.

Mir Ali Farajzadeh et al.

Biomedical chromatography : BMC, 29(12), 1921-1931 (2015-05-28)

In present study, a simultaneous derivatization and air-assisted liquid-liquid microextraction method combined with gas chromatography-nitrogen phosphorous detection has been developed for the determination of some phenolic compounds in biological samples. The analytes are derivatized and extracted simultaneously by a fast

Single-Scan Multidimensional NMR Analysis of Mixtures at Sub-Millimolar Concentrations by using SABRE Hyperpolarization.

Valeria Daniele et al.

Chemphyschem : a European journal of chemical physics and physical chemistry, 16(16), 3413-3417 (2015-08-26)

Signal amplification by reversible exchange (SABRE) is a promising method to increase the sensitivity of nuclear magnetic resonance (NMR) experiments. However, SABRE-enhanced (1)H NMR signals are short lived, and SABRE is often used to record 1D NMR spectra only. When the

Vibrational spectroscopic investigation on the structure of 2-ethylpyridine-4-carbothioamide.

S Muthu et al.

Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, 93, 214-222 (2012-04-07)

Fourier transform Raman and Fourier transform infrared spectra of 2-ethylpyridine-4-carbothioamide were recorded in the regions 3600-100 cm(-1) and 4000-450 cm(-1), respectively in the solid phase. 2-Ethylpyridine-4-carbothioamide is used as anti-tubercular agent that inhibits mycolic acid synthesis. The equilibrium geometry harmonic

Evolution of strategies to achieve baseline separation of ten anionic, water-soluble sulfated estrogens via achiral packed column supercritical fluid chromatography.

M A Patel et al.

Journal of chromatography. A, 1370, 240-245 (2014-12-03)

Near baseline separation of ten sulfated sodium salts of various structurally related estrogens employing a variety of bonded stationary phase packed columns was obtained using a conventional supercritical fluid chromatograph coupled with UV detection. Critical pairs 2/3 (8,9-dehydroestrone/17β-dihydroequilin) and 6/7

Biodegradation of 2-methyl, 2-ethyl, and 2-hydroxypyridine by an Arthrobacter sp. isolated from subsurface sediment.

E J O'Loughlin et al.

Biodegradation, 10(2), 93-104 (1999-08-31)

A bacterium capable of degrading 2-methylpyridine was isolated by enrichment techniques from subsurface sediments collected from an aquifer located at an industrial site that had been contaminated with pyridine and pyridine derivatives. The isolate, identified as an Arthrobacter sp., was

Identification of distinctive volatile compounds in fish sauce.

Katsuya Fukami et al.

Journal of agricultural and food chemistry, 50(19), 5412-5416 (2002-09-05)

To make clear the distinctive odorants of fish sauce, addition tests were carried out with respect to deodorized fish sauce samples. Volatiles from the headspace gas of nontreated fish sauce and deodorized fish sauce were characterized by gas chromatography-olfactometry and

Ammonia as a preferred additive in chiral and achiral applications of supercritical fluid chromatography for small, drug-like molecules.

Manuel Ventura et al.

Journal of chromatography. A, 1220, 147-155 (2011-12-22)

Supercritical fluid chromatography is routinely utilized by analytical separations groups in the pharmaceutical industry to efficiently handle separations for discovery medicinal chemistry purposes. Purifications are performed on samples ranging from a few milligrams up to hundreds of grams. Basic additives

Analysis of basic compounds by supercritical fluid chromatography: attempts to improve peak shape and maintain mass spectrometry compatibility.

Alexandre Grand-Guillaume Perrenoud et al.

Journal of chromatography. A, 1262, 205-213 (2012-09-25)

While neutral and acidic compounds are well separated by supercritical fluid chromatography (SFC), basic analytes are more challenging to separate and often problems occur with their peak shapes. Two different methods were explored in the present paper to reduce these

Self-assembled hybrid metal oxide base catalysts prepared by simply mixing with organic modifiers.

Masazumi Tamura et al.

Nature communications, 6, 8580-8580 (2015-10-06)

Multidentate materials formed by simply mixing heterogeneous and homogeneous components are promising for construction of versatile active sites on the surface of heterogeneous compounds, however, to the best of our knowledge, there are no reports on such materials. Self-assembly of

Effect of increasing concentration of ammonium acetate as an additive in supercritical fluid chromatography using CO2-methanol mobile phase.

Amaury Cazenave-Gassiot et al.

Journal of chromatography. A, 1216(36), 6441-6450 (2009-08-01)

The effects of increasing concentrations of ammonium acetate additive in supercritical fluid chromatography were studied on silica, 2-ethyl-pyridine and endcapped 2-ethyl-pyridine stationary phases. The study involved the addition of increasing concentrations of the ammonium acetate either in the mobile phase

Identification of components responsible for the odor of cigar smoker's breath.

Russell Bazemore et al.

Journal of agricultural and food chemistry, 54(2), 497-501 (2006-01-19)

Following smoking 1/2 of a cigar, the most odorous cigar tobacco smoke components extracted from the surface of the tongue by nylon-meshed swabs and then extracted from the swab headspace by solid phase microextraction were ethyl pyrrole, 2,3-dimethyl pyrazine, and

Direct sampling tandem mass spectrometry (MS/MS) and multiway calibration for isomer quantitation.

Cleidiane G Zampronio et al.

The Analyst, 127(8), 1054-1060 (2002-08-28)

Direct sampling tandem mass spectrometry (MS/MS) was used for the quantitation of mixtures of the isomers 2-, 3- and 4-ethyl pyridine. The similarity between the analytes and the second-order nature of MS/MS data require the use of multivariate calibration techniques

2-(2-Pyridyl)ethyl group: new type protecting group in the synthesis of DNA via phosphoramidite intermediates.

S Hamamoto et al.

Nucleic acids symposium series, (17)(17), 93-96 (1986-01-01)

2-(2-Pyridyl)ethyl group is a new type P-O protecting group for the synthesis of oligodeoxyribonucleotides by the phosphite triester method. This group is stable to alkali and acid conditions, and to be removed from internucleotidic bonds under mild conditions via two

Screening strategy for chiral and achiral separations in supercritical fluid chromatography mode.

David Speybrouck et al.

Current topics in medicinal chemistry, 12(11), 1250-1263 (2012-05-11)

Supercritical fluid (SF) was discovered 200 years ago, but the use of this fluid as a mobile phase in chromatography only became popular fifty years ago. The development of the supercritical fluid chromatography (SFC) was progressing slowly due to technological

Ambient preparation and reactions of gas phase silver cluster cations and anions.

Michael Wleklinski et al.

Physical chemistry chemical physics : PCCP, 17(28), 18364-18373 (2015-06-25)

Electrospray ionization of metal salt solutions followed by ambient heating transforms the resulting salt clusters into new species, primarily naked ionic metal clusters. The experiment is done by passing the clusters through a heated coiled loop outside the mass spectrometer

Pharmaceutical analysis by supercritical fluid chromatography: Optimization of the mobile phase composition on a 2-ethylpyridine column.

Claudio Brunelli et al.

Journal of separation science, 31(8), 1299-1306 (2008-04-04)

The separation of neutral, acidic, and basic pharmaceuticals with diverse physicochemical properties by packed column supercritical fluid chromatography (pSFC) on a 2-ethylpyridine column (25 cmx4.6 mm id, 3 mum particles) is presented. The optimization strategy involved separations at 100% methanol

Pyridines in cigarette smoke inhibit hamster oviductal functioning in picomolar doses.

Karen Riveles et al.

Reproductive toxicology (Elmsford, N.Y.), 17(2), 191-202 (2003-03-19)

Past studies showed that chemicals in cigarette smoke inhibit oviductal functioning in vivo and in vitro. The purposes of this study were to identify individual toxicants in cigarette smoke solutions that inhibit various aspects of oviductal functioning and to determine

Isolation of oxidative degradation products of atorvastatin with supercritical fluid chromatography.

Slavko Klobčar et al.

Biomedical chromatography : BMC, 29(12), 1901-1906 (2015-05-27)

The isolation of four oxidative degradation products of atorvastatin using preparative high-performance liquid chromatography applying at least two chromatographic steps is known from the literature. In this paper it is shown that the same four impurities could be isolated from

Consequences of molecular recognition in the S1-S2 intersubsite region of papain for catalytic-site chemistry. Change in pH-dependence characteristics and generation of an inverse solvent kinetic isotope effect by introduction of a P1-P2 amide bond into a two-protonic-state reactivity probe.

K Brocklehurst et al.

The Biochemical journal, 250(3), 761-772 (1988-03-15)

1. The pH-dependences of the second-order rate constant (k) for the reactions of papain (EC 3.4.22.2) with 2-(acetamido)ethyl 2'-pyridyl disulphide and with ethyl 2-pyridyl disulphide and of k for the reaction of benzimidazol-2-ylmethanethiol (as a minimal model of cysteine proteinase

Oxyfunctionalization of pyridine derivatives using whole cells of Burkholderia sp. MAK1.

Jonita Stankevičiūtė et al.

Scientific reports, 6, 39129-39129 (2016-12-17)

Pyridinols and pyridinamines are important intermediates with many applications in chemical industry. The pyridine derivatives are in great demand as synthons for pharmaceutical products. Moreover, pyridines are used either as biologically active substances or as building blocks for polymers with

Evaluation of stationary phases packed with superficially porous particles for the analysis of pharmaceutical compounds using supercritical fluid chromatography.

Alexandre Grand-Guillaume Perrenoud et al.

Journal of chromatography. A, 1360, 275-287 (2014-08-19)

Superficially porous particles (SPP), or core shell particles, which consist of a non-porous silica core surrounded by a thin shell of porous silica, have gained popularity as a solid support for chromatography over the last decade. In the present study

Smoke from traditional commercial, harm reduction and research brand cigarettes impairs oviductal functioning in hamsters (Mesocricetus auratus) in vitro.

K Riveles et al.

Human reproduction (Oxford, England), 22(2), 346-355 (2006-10-31)

Cigarette smoke from 2R1 research brand cigarettes and specific toxicants in smoke inhibit oviductal functioning. Our purpose was to test the hypothesis that smoke from commercial cigarettes, including harm reduction cigarettes, inhibits oviductal functioning and to measure the concentration of

Cigarette smoke toxicants alter growth and survival of cultured mammalian cells.

Richard Yu et al.

Toxicological sciences : an official journal of the Society of Toxicology, 93(1), 82-95 (2006-06-23)

Our purpose was to determine the effects of six cigarette toxicants (pyridine, nicotine, 2-ethylpyridine, 3-ethylpyridine, p-cresol, and pyrazine) on three types of cultured mammalian cells (human umbilical vein endothelial cells [HUVECs], human microvascular endothelial cells [HMVECs], and NIH 3T3 cells)

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