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Showing 1-30 of 441 results for "24246" within Papers
X P Lee et al.
Journal of chromatography. B, Biomedical sciences and applications, 734(1), 155-162 (1999-11-26)
Methanol and its metabolite formic acid have been found extractable from human whole blood and urine by headspace solid-phase microextraction (SPME) with a Carboxen/polydimethylsiloxane fiber. The headspace SPME for formic acid was carried out after derivatization to methyl formate under
Virginie Larroque et al.
Journal of chromatography. A, 1124(1-2), 106-111 (2006-06-14)
Solid-phase microextraction (SPME) was applied to the on-site analysis of volatile organic compounds (VOCs) in indoor air. The compounds were at trace levels, which complicates analysis and also sample storage. Fibre storage before and after sampling was studied. Several tests
Sebastien Allard et al.
Journal of chromatography. A, 1238, 15-21 (2012-04-13)
Trihalomethanes are predominantly formed during disinfection of water via reactions of the oxidant with natural organic matter. Even though chlorinated and brominated trihalomethanes are the most widespread organic contaminants in drinking water, when iodide is present in raw water iodinated
Simonetta Tumbiolo et al.
Analytical and bioanalytical chemistry, 380(5-6), 824-830 (2004-11-02)
The aim of the study was to analyse BTEX compounds (benzene, toluene, ethylbenzene, xylenes) in air by solid phase micro-extraction/gas chromatography/mass spectrometry (SPME/GC/MS), and this article presents the features of the calibration method proposed. Examples of real-world air analysis are
Jérôme Nicolle et al.
Journal of chromatography. A, 1208(1-2), 10-15 (2008-09-06)
A new sampling method was developed for a simple and fast evaluation of volatile organic compounds (VOCs) emitted at trace levels from building materials. The device involves an emission cell coupled with solid phase microextraction (SPME) for diffusive sampling. Owing
J Andrasko et al.
Journal of forensic sciences, 48(2), 307-311 (2003-04-01)
The estimation of time since the latest discharge of pistols and revolvers has been achieved by the Solid Phase Microextraction (SPME) sampling technique and the GC/TEA analytical system. The TEA2 compound, which in our previous work (1) was observed in
Sanja Risticevic et al.
Analytica chimica acta, 617(1-2), 72-84 (2008-05-20)
Increasing consumer awareness of food safety issues requires the development of highly sophisticated techniques for the authentication of food commodities. The food products targeted for falsification are either products of high commercial value or those produced in large quantities. For
Yi Xia et al.
Journal of chromatographic science, 53(1), 1-7 (2014-03-29)
Headspace solid-phase microextraction (HS-SPME) coupled with gas chromatography-quadrupole time-of-flight mass spectrometry (GC-QTOF MS) has been used in the present study to isolate and identify volatile components from Siraitia grosvenorii, a herbaceous perennial vine used as a natural sweetener and medicine.
Lucia Giordano et al.
Journal of chromatography. A, 1017(1-2), 141-149 (2003-10-31)
A new method was developed for the determination of 2-furfural (2-F) and 5-methylfurfural (5-MF), two products of Maillard reaction in vinegar, with head-space solid-phase microextraction (HS-SPME) coupled to gas chromatography-mass spectrometry (GC-MS). A divinylbenzene (DVB)/carboxen (CAR)/polydimethylsiloxane (PDMS) fibre was used
Yong-Hyun Kim et al.
Analytical chemistry, 84(9), 4126-4139 (2012-04-04)
Sorbent tubes (STs) are highly efficient and versatile tools for collecting gaseous samples of volatile organic compounds (VOCs). In order to assess the experimental bias in their application, the relative recovery (RR) of 19 VOCs (acetaldehyde, propionaldehyde, butyraldehyde, isovaleraldehyde, valeraldehyde
Zhen-Ming Lu et al.
Food chemistry, 127(2), 662-668 (2011-07-15)
In this work a headspace solid-phase microextraction (HS-SPME) coupled with gas chromatography-mass spectrometry (GC-MS) and GC-olfactometry (GC-O) was developed to evaluate the profile of the volatile compounds that contribute to the aroma of Antrodia camphorata in submerged culture. For this
D D Roberts et al.
Journal of agricultural and food chemistry, 48(6), 2430-2437 (2000-07-11)
Solid-phase microextraction (SPME) fibers were evaluated for their ability to adsorb volatile flavor compounds under various conditions with coffee and aqueous flavored solutions. Experiments comparing different fibers showed that poly(dimethylsiloxane)/divinylbenzene had the highest overall sensitivity. Carboxen/poly(dimethylsiloxane) was the most sensitive
Hamed Mirhosseini et al.
Phytochemical analysis : PCA, 19(5), 429-437 (2008-04-26)
Solid-phase microextraction (SPME) coupled to gas chromatography has been applied for the headspace analysis (HS) of 12 target flavour compounds in a model orange beverage emulsion. The main volatile flavour compounds studied were: acetaldehyde, ethyl acetate, alpha-pinene, ethyl butyrate, beta-pinene
Ruth Barro et al.
Journal of chromatography. A, 1045(1-2), 189-196 (2004-09-24)
In this study, a combination of solid-phase extraction (SPE) and solid-phase microextraction (SPME) has been used to determine chlorobenzenes in air. Analytes were sampled by pumping a known volume of air through a porous polymer (Tenax TA). Then, the adsorbent
M Akiyama et al.
Journal of food science, 72(7), C388-C396 (2007-11-13)
Headspace volatiles of freshly brewed drip coffee were investigated by gas chromatography/mass spectrometry (GC/MS) and gas chromatography/olfactometry (GC/O, CharmAnalysis) analyses. For this purpose, a solid-phase microextraction (SPME) sampling method for the headspace volatiles of freshly brewed drip coffee was developed.
Edna Razote et al.
Journal of environmental science and health. Part. B, Pesticides, food contaminants, and agricultural wastes, 37(4), 365-378 (2002-06-26)
A new dynamic air sampling system was devised and evaluated in conjunction with solid phase microextraction (SPME) fiber materials for extracting odor-causing volatile organic compounds (VOCs) present in swine building environments. Utilizing a standard solution consisting of 11 compounds (i.e.
Annika T Nielsen et al.
The Analyst, 127(8), 1045-1049 (2002-08-28)
A method was developed for the simultaneous determination of the following nine volatile sulfur compounds in gas samples: carbon disulfide, carbonyl sulfide, ethyl sulfide, ethyl methyl sulfide, hydrogen sulfide, isopropanethiol, methanethiol, methyl disulfide and methyl sulfide. The target compounds were
Antonia María Carro et al.
Analytical and bioanalytical chemistry, 394(3), 893-901 (2009-04-11)
The headspace solid-phase micro-extraction technique with on-fibre derivatisation followed by gas chromatography-tandem mass spectrometry has been evaluated for the analysis of 1,3-dichloro-2-propanol in water. An asymmetric factorial design has been performed to study the influence of five experimental factors: extraction
A Sanches-Silva et al.
Journal of chromatography. A, 1064(2), 239-245 (2005-03-03)
Headspace solid-phase microextraction (HS-SPME) was studied as a solvent free alternative method for the extraction and characterisation of volatile compounds in stored potato crisps by capillary gas chromatography coupled with mass detection. Better results were obtained when extraction was carried
Mahmoud Heidari et al.
Talanta, 131, 142-148 (2014-10-05)
In this paper we describe the application of a needle trap microextraction device packed with graphene nanoplatelets for the sampling and analysis of perchloroethylene in dry cleaning. The study was carried out in two phases. First the parameters for the
Dawn M Chapman et al.
Journal of agricultural and food chemistry, 52(17), 5431-5435 (2004-08-19)
A rapid and automated solid phase microextraction (SPME) stable isotope dilution gas chromatography/mass spectrometry (GC-MS) method for 2-methoxy-3-isobutylpyrazine (MIBP) quantification in red wine was developed. Wines with 30% (w/v) NaCl and 2-methoxy-(2)H(3)-3-isobutylpyrazine internal standard were sampled with a 2 cm
Diana Poli et al.
Journal of chromatography. B, Analytical technologies in the biomedical and life sciences, 820(1), 95-102 (2005-05-04)
A method for the determination of volatile chlorinated hydrocarbons, namely dichloromethane (DCM), trichloroethylene (TCE), and perchloroethylene (PCE), in urine samples was developed using headspace solid phase microextraction (HS-SPME) gas chromatography-mass spectrometry (GC-MS). HS-SPME was performed using a 75 microm Carboxen-polydimethylsiloxane
Alejandra Ribes et al.
Journal of chromatography. A, 1140(1-2), 44-55 (2006-12-26)
An analytical method based on thermal desorption (TD) coupled to gas chromatography (GC) and mass spectrometry detection (MS) has been developed and validated for the determination of a wide range of odor nuisance and air-quality volatile organic compounds (VOC) in
C Martínez et al.
Talanta, 116, 937-945 (2013-10-24)
This study focuses on the development of an analytical method based on headspace solid phase microextraction (HS-SPME) and gas chromatography-mass spectrometry (GC-MS) for the simultaneous determination of 76 micropollutants in water samples. The selected micropollutants include volatile organic compounds (VOCs)
Carla Da Porto et al.
Planta medica, 74(2), 182-187 (2008-02-06)
Headspace solid-phase microextraction (HS-SPME) coupled to gas chromatography and mass spectrometry using the divinyl/carboxen/polydimethylsiloxane (DVB-CAR-PDMS) fibre was applied for the analysis of aroma profiles of Lavandula angustifolia L. flowers and the corresponding essential oils. The optimal sampling time was determined
Alireza Ghiasvand et al.
Biomedical chromatography : BMC, 31(12) (2017-06-16)
The surface of a stainless steel fiber was made larger, porous and cohesive by platinizing for tight attachment of its coating. Then it was coated by a polyaniline/polypyrrole/graphene oxide (PANI/PP/GO) nanocomposite film using electrochemical polymerization. The prepared PANI/PP/GO fiber was
R T Marsili
Journal of agricultural and food chemistry, 47(2), 648-654 (1999-11-24)
A new technique using solid-phase microextraction, mass spectrometry, and multivariate analysis (SPME-MS-MVA) was developed for the study of off-flavors in milk. The analytical column of a GC/MS system was replaced with a 1-m deactivated fused-silica column, which served as a
J S Elmore et al.
Journal of chromatography. A, 905(1-2), 233-240 (2001-02-24)
The volatile aroma compounds in cooked pork were examined using solid-phase microextraction (SPME). Two SPME fibres coated with different stationary phases were used simultaneously to collect aroma compounds from the headspace above the pork. One fibre was coated with 75
X P Lee et al.
Legal medicine (Tokyo, Japan), 1(4), 231-237 (2003-08-26)
An improved method for extraction of thinner components in human whole blood and urine samples by headspace solid-phase microextraction (SPME) with a Carboxen/polydimethylsiloxane-coated fiber is presented. The body fluid samples, containing ethyl acetate, benzene, 1-butanol, toluene, butyl acetate, isoamyl acetate
E Biondi et al.
Talanta, 129, 422-430 (2014-08-17)
A commercial electronic nose (e-nose) equipped with a metal oxide sensor array was trained to recognize volatile compounds emitted by potatoes experimentally infected with Ralstonia solanacearum or Clavibacter michiganensis subsp. sepedonicus, which are bacterial agents of potato brown and ring
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