57301

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Showing 1-30 of 2113 results for "57301" within Papers

Octadecylsilane/Nylon-6 composite as a thin-film microextraction sorbent for the determination of bisphenol A in water samples.

Mohammad Saraji et al.

Journal of separation science, 39(18), 3616-3623 (2016-07-28)

We report on the fabrication of a thin-film composite for the extraction of bisphenol A from aqueous solutions. Nylon-6, C18 particles, and polyethylene glycol were used to prepare the thin film sorbent. Bisphenol A was used as a model compound

Determination of the oxidative stress biomarker urinary 8-hydroxy-2'-deoxyguanosine by automated on-line in-tube solid-phase microextraction coupled with liquid chromatography-tandem mass spectrometry.

Hiroyuki Kataoka et al.

Journal of chromatography. B, Analytical technologies in the biomedical and life sciences, 1019, 140-146 (2015-09-10)

A simple and sensitive method for the determination of 8-hydroxy-2'-deoxyguanosine (8-OHdG), a marker of oxidative DNA damage in human urine, was developed using automated on-line in-tube solid-phase microextraction (SPME) coupled with stable isotope-dilution liquid chromatography-tandem mass spectrometry (LC-MS/MS). Creatinine was

Utilization of highly robust and selective crosslinked polymeric ionic liquid-based sorbent coatings in direct-immersion solid-phase microextraction and high-performance liquid chromatography for determining polar organic pollutants in waters.

Idaira Pacheco-Fernández et al.

Talanta, 158, 125-133 (2016-06-28)

Several crosslinked polymeric ionic liquid (PIL)-based sorbent coatings of different nature were prepared by UV polymerization onto nitinol wires. They were evaluated in a direct-immersion solid-phase microextraction (DI-SPME) method in combination with high-performance liquid chromatography (HPLC) and diode array detection

Automated method for determination of dissolved organic carbon-water distribution constants of structurally diverse pollutants using pre-equilibrium solid-phase microextraction.

Matyas Ripszam et al.

Environmental toxicology and chemistry, 34(2), 266-274 (2014-11-14)

Dissolved organic carbon (DOC) plays a key role in determining the environmental fate of semivolatile organic environmental contaminants. The goal of the present study was to develop a method using commercially available hardware to rapidly characterize the sorption properties of

Determination of glutaraldehyde in water samples by headspace solid-phase microextraction and gas chromatography-mass spectrometry after derivatization with 2,2,2-trifluoroethylhydrazine.

Hye-In Kang et al.

Journal of chromatography. A, 1448, 115-120 (2016-05-01)

A simple and convenient headspace solid-phase microextraction (HS-SPME) gas chromatography mass spectrometry (GC-MS) method was described for the determination of glutaraldehyde in water. Glutaraldehyde in water reacted with 2,2,2-trifluoroethylhydrazine (TFEH) in a headspace vial and the formed TFEH derivatives were

Environmentally friendly solid-phase microextraction coupled with gas chromatography and mass spectrometry for the determination of biogenic amines in fish samples.

Jie Huang et al.

Journal of separation science, 39(22), 4384-4390 (2016-11-03)

In this work, a facile and environmentally friendly solid-phase microextraction assay based on on-fiber derivatization coupled with gas chromatography and mass spectrometry was developed for determining four nonvolatile index biogenic amines (putrescine, cadaverine, histamine, and tyramine) in fish samples. In

Determining octanol-water partition coefficients for extremely hydrophobic chemicals by combining "slow stirring" and solid-phase microextraction.

Michiel T O Jonker

Environmental toxicology and chemistry, 35(6), 1371-1377 (2015-11-10)

Octanol-water partition coefficients (KOW ) are widely used in fate and effects modeling of chemicals. Still, high-quality experimental KOW data are scarce, in particular for very hydrophobic chemicals. This hampers reliable assessments of several fate and effect parameters and the

Influence of different salting processes on the evolution of the volatile metabolites of vacuum-packed fillets of farmed and wild sea bass (Dicentrarchus labrax) stored under refrigeration conditions: a study by SPME-GC/MS.

Natalia P Vidal et al.

Journal of the science of food and agriculture, 97(3), 967-976 (2016-05-27)

Fish shelf-life extension is a topic of great interest. In this study the behaviour of salted and unsalted farmed and wild European sea bass (Dicentrarchus labrax) fillets during storage was analysed through the evolution of their volatile metabolites. Farmed and

GC-MS metabolomics-based approach for the identification of a potential VOC-biomarker panel in the urine of renal cell carcinoma patients.

Márcia Monteiro et al.

Journal of cellular and molecular medicine, 21(9), 2092-2105 (2017-04-06)

The analysis of volatile organic compounds (VOCs) emanating from biological samples appears as one of the most promising approaches in metabolomics for the study of diseases, namely cancer. In fact, it offers advantages, such as non-invasiveness and robustness for high-throughput

Detection of "bath salt" synthetic cathinones and metabolites in urine via DART-MS and solid phase microextraction.

Joseph LaPointe et al.

Journal of the American Society for Mass Spectrometry, 26(1), 159-165 (2014-10-16)

A rapid and sensitive method, direct analysis in real time mass spectrometry (DART-MS) was applied to the characterization and semiquantitative analysis of synthetic cathinones and their metabolites in urine. DART-MS was capable of detecting three different cathinones and three metabolites

Chronic toxicity of selected polycyclic aromatic hydrocarbons to algae and crustaceans using passive dosing.

Gail E Bragin et al.

Environmental toxicology and chemistry, 35(12), 2948-2957 (2016-05-07)

Because of the large number of possible aromatic hydrocarbon structures, predictive toxicity models are needed to support substance hazard and risk assessments. Calibration and evaluation of such models requires toxicity data with well-defined exposures. The present study has applied a

Effect of Se treatment on the volatile compounds in broccoli.

Jiayu Lv et al.

Food chemistry, 216, 225-233 (2016-09-07)

Broccoli contains high levels of bioactive compounds but deteriorates and senesces easily. In the present study, freshly harvested broccoli was treated with selenite and stored at two different temperatures. The effect of selenite treatment on sensory quality and postharvest physiology

Identification and quantification of odours from oxobiodegradable polyethylene oxidised under a free radical flow by headspace solid-phase microextraction followed by gas chromatography-olfactometry-mass spectrometry.

Magdalena Wrona et al.

Talanta, 172, 37-44 (2017-06-13)

Recently oxobiodegradable polyethylene gained popularity as food packaging material due to its potential to reduce polymer waste. However, this type of material can release after its oxidation off-odour compounds that affect the organoleptic properties of packaged food. Odour compounds released

Foal meat volatile compounds: effect of vacuum ageing on semimembranosus muscle.

Aristide Maggiolino et al.

Journal of the science of food and agriculture, 99(4), 1660-1667 (2018-09-11)

Cooked meat flavor arises through a combination of thermally generated aroma volatile and nonvolatile compounds in a matrix of muscle fiber, connective tissue, and fat. Ageing could affect meat odor, taste, and flavor by the development of odor compounds in

Volatile profiles of toxigenic and non-toxigenic Aspergillus flavus using SPME for solid phase extraction.

Anthony J De Lucca et al.

Annals of agricultural and environmental medicine : AAEM, 17(2), 301-308 (2010-12-29)

Toxigenic and atoxigenic strains of Aspergillus flavus were grown on potato dextrose agar (PDA) and wetted (23% moisture) sterile, cracked corn for 14 and 21 days, respectively. Volatile compounds produced by A. flavus, as well as those present in the

Determination of Tobacco Alkaloids Using SPME and GC-NPD

Yang, S.; Smetena, I.

Chromatographia, 47 (7-8), 443-448 (1998)

Determination of phthalate esters in drinking water and edible vegetable oil samples by headspace solid phase microextraction using graphene/polyvinylchloride nanocomposite coated fiber coupled to gas chromatography-flame ionization detector.

Hatam Amanzadeh et al.

Journal of chromatography. A, 1465, 38-46 (2016-09-07)

In the current study, a graphene/polyvinylchloride nanocomposite was successfully coated on a stainless steel substrate by a simple dip coating process and used as a novel headspace solid phase microextraction (HS-SPME) fiber for the extraction of phthalate esters (PEs) from

SPME Associated with Microwave Assisted Extraction of Food Products

Wang, Y., et al.

Journal of High Resolution Chromatography, 20 (4), 213-216 (1997)

Acetone-activated polyimide electrospun nanofiber membrane for thin-film microextraction and thermal desorption-gas chromatography-mass spectrometric analysis of phenols in environmental water.

Shenghong Li et al.

Journal of chromatography. A, 1411, 1-8 (2015-08-19)

In this work, a polyimide nanofiber membrane was electrospun and applied as sorbent for thin film microextraction (TFME). After TFME of phenols in water samples, direct thermal desorption of the sorbent at 300°C followed by gas chromatography-mass spectrometric (TD-GC-MS) analysis

Analysis of urinary 8-isoprostane as an oxidative stress biomarker by stable isotope dilution using automated online in-tube solid-phase microextraction coupled with liquid chromatography-tandem mass spectrometry.

Keisuke Mizuno et al.

Journal of pharmaceutical and biomedical analysis, 112, 36-42 (2015-05-10)

We have developed a simple and sensitive method for the determination of the oxidative stress biomarker 8-isoprostane (8-IP) in human urine by automated online in-tube solid-phase microextraction (SPME) coupled with liquid chromatography-tandem mass spectrometry (LC-MS/MS) using a Zorbax Eclipse XDB-8

Molecularly imprinted sol-gel nanofibers based solid phase microextraction coupled on-line with high performance liquid chromatography for selective determination of acesulfame.

Mohammad Mahdi Moein et al.

Talanta, 134, 340-347 (2015-01-27)

Sol-gel based molecularly imprinted polymer (MIP) nanofiber was successfully fabricated by electrospinning technique on the surface of a stainless steel bar. The manufactured tool was applied for on-line selective solid phase microextraction (SPME) and determination of acesulfame (ACF) as an

Optimisation of gellan gum edible coating for ready-to-eat mango (Mangifera indica L.) bars.

Florina Danalache et al.

International journal of biological macromolecules, 84, 43-53 (2015-12-15)

The optimisation of an edible coating based on low acyl (L)/high acyl (H) gellan gum for ready-to-eat mango bars was performed through a central composite rotatable design (CCRD). The independent variables were the concentration of gellan (L/H90/10) and the concentration

An indirect assay for volatile compound production in yeast strains.

Davide Ravasio et al.

Scientific reports, 4, 3707-3707 (2014-01-16)

Traditional flavor analysis relies on gas chromatography coupled to mass spectrometry (GC-MS) methods. Here we describe an indirect method coupling volatile compound formation to an ARO9-promoter-LacZ reporter gene. The resulting β-galactosidase activity correlated well with headspace solid phase micro extraction

The effect of oligofructose on urea metabolism and faecal odour components in cats.

M Hesta et al.

Journal of animal physiology and animal nutrition, 89(3-6), 208-214 (2005-03-25)

The effect on urea metabolism by the supplementation of oligofructose to a reduced protein diet was evaluated in cats by the use of labelled urea. The effect on faecal odour was also evaluated. Four cats were tested in a crossover

Dispersive solid-phase microextraction with graphene oxide based molecularly imprinted polymers for determining bis(2-ethylhexyl) phthalate in environmental water.

Lidong Cheng et al.

Journal of chromatography. A, 1511, 85-91 (2017-07-12)

A novel graphene oxide-molecularly imprinted polymers (GO-MIPs) was prepared and applied for selective extraction and preconcentration of bis(2-ethylhexyl) phthalate (DEHP) in environmental water samples by using the dispersive solid-phase microextraction (DSPME) method. The GO-MIPs was synthesized via precipitation polymerization using

Sensitive multiresidue method by HS-SPME/GC-MS for 10 volatile organic compounds in urine matrix: a new tool for biomonitoring studies on children.

Arianna Antonucci et al.

Analytical and bioanalytical chemistry, 408(21), 5789-5800 (2016-06-18)

A HS-SPME method coupled with GC-MS analysis has been developed for simultaneously measuring the concentration of 10 volatile organic compounds (VOCs) (benzene, toluene, ethylbenzene, o-, m-, and p-xylene, methyl tert-butyl ether, ethyl tert-butyl ether, 2-methyl-2-butyl methyl ether, and diisopropyl ether)

Preparation of C18 composite solid-phase microextraction fiber and its application to the determination of organochlorine pesticides in water samples.

Siyan Li et al.

Analytica chimica acta, 873, 57-62 (2015-04-26)

In this work, a C18 composite solid-phase microextraction (SPME) fiber was prepared with a new method and applied to the analysis of organochlorine pesticides (OCPs) in water sample. A stainless steel wire (o.d. 127 μm) was used as the substrate

Solid-phase microextraction set-up for the analysis of liver volatolome to detect livestock exposure to micropollutants.

Jihéne Bouhlel et al.

Journal of chromatography. A, 1497, 9-18 (2017-04-04)

Starting from a critical analysis of a first "proof of concept" study on the utility of the liver volatolome for detecting livestock exposure to environmental micropollutants (Berge et al., 2011), the primary aim of this paper is to improve extraction

An analytical method to identify traces of white phosphorus on burned victim clothes.

Dan Muller et al.

Forensic science international, 280, 224-227 (2017-10-29)

We report for the first time, the chemical identification of phosphorus on the remains of burned clothes taken from an injured woman. The woman was accidentally burned as a result of spontaneous combustion of a "stone" pebble-like material her daughter

Effect of ozonization in degradation of trifluralin residues in aqueous and food matrices.

Maria A L Milhome et al.

Journal of environmental science and health. Part. B, Pesticides, food contaminants, and agricultural wastes, 53(12), 786-792 (2018-09-11)

This study investigates the oxidation of trifluralin residues during ozonation in aqueous and food matrices (tomato). Domestic ozonation equipment with average production of 23.9 mg O3 L-1 h-1 was used in the tests. Modern chromatographic systems (SPME-GC-IT/MS/MS and QuEChERS-GC-IT/MS/MS) were applied for extraction

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