57295-U

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Showing 1-30 of 2072 results for "57295-U" 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

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

Characterization of volatile compounds in fermented milk using solid-phase microextraction methods coupled with gas chromatography-mass spectrometry.

T Dan et al.

Journal of dairy science, 100(4), 2488-2500 (2017-02-06)

Lactic acid bacteria (LAB) are industrially important bacteria that are widely used in the fermented food industry, especially in the manufacture of yogurt. Characteristic flavors are produced by LAB during fermentation and storage that affect the quality and acceptability of

Effect of the presence of protein on lipolysis and lipid oxidation occurring during in vitro digestion of highly unsaturated oils.

Bárbara Nieva-Echevarría et al.

Food chemistry, 235, 21-33 (2017-05-31)

The effect of the presence of ovalbumin and soy protein isolate on lipolysis and oxidation taking place during in vitro gastrointestinal digestion of slightly oxidized sunflower and flaxseed oils was addressed. The extent of lipolysis, the molar proportions of acyl

Determination of ibuprofen enantiomers in breast milk using vortex-assisted matrix solid-phase dispersion and direct chiral liquid chromatography.

M E León-González et al.

Journal of chromatography. A, 1514, 88-94 (2017-08-03)

A mixture of β-cyclodextrin (β-CD) and primary and secondary amine (PSA) sorbents was employed for the extraction and quantification of ibuprofen enantiomers from human breast milk, combining a vortex-assisted matrix solid-phase dispersion method (MSPD) and direct chiral liquid chromatography (CLC)

Use of gas chromatography-mass spectrometry/solid phase microextraction for the identification of MVOCs from moldy building materials.

Loay Wady et al.

Journal of microbiological methods, 52(3), 325-332 (2003-01-18)

Gas chromatography-mass spectrometry/solid phase microextraction (GC-MS/SPME) was applied to identify microbial volatile organic compounds (MVOCs) in water-damaged, mold-infested building materials (gypsum board papers (n=2), mineral wool, and masonite) and in cultivated molds (Aspergillus penicillioides, Stachybotrys chartarum, and Chaetomium globosum). Three

Automated capillary gas chromatographic system to monitor ethylene emitted from biological materials.

H Pham-Tuan et al.

Journal of chromatography. A, 868(2), 249-259 (2000-03-04)

An automated capillary gas chromatographic system to measure ethylene emitted from biological materials is presented. The system consists of an on-line sampling device, a thermodesorption preconcentration apparatus and a capillary gas chromatograph with a flame ionization detection system. The limit

Comparative analysis of odorous volatile organic compounds between direct injection and solid-phase microextraction: development and validation of a gas chromatography-mass spectrometry-based methodology.

Sudhir Kumar Pandey et al.

Journal of chromatography. A, 1216(28), 5436-5444 (2009-06-06)

In this study, the feasibility of GC-MS was evaluated for the quantification of odorous volatile organic compounds (VOCs) in environmental samples. These included methyl ethyl ketone, isobutyl alcohol, methyl isobutyl ketone, and butyl acetate plus benzene, toluene, and xylene (BTX).

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

Selective extraction of 3,4-dihydroxybenzoic acid in Ilex chinensis Sims by meticulous mini-solid-phase microextraction using ternary deep eutectic solvent-based molecularly imprinted polymers.

Guizhen Li et al.

Analytical and bioanalytical chemistry, 410(30), 7849-7858 (2018-10-05)

A ternary deep eutectic solvent (TDES) was used as both template and functional monomer in the synthesis of TDES-based molecularly imprinted polymers (TDES-MIPs). A meticulous miniaturized solid-phase microextraction (mini-SPME) method followed by high-performance liquid chromatography (HPLC) were used for the

In-tube solid-phase microextraction based on NH

Xialin Luo et al.

Talanta, 165, 377-383 (2017-02-06)

In this work, a novel NH

Evaluation of solid-phase microextraction for time-weighted average sampling of volatile sulfur compounds at ppb concentrations.

François Lestremau et al.

Analytical chemistry, 75(11), 2626-2632 (2003-09-02)

The potential of solid-phase microextraction (SPME) for time-weighted average (TWA) sampling of volatile sulfur compounds in air at ppb concentrations was investigated. The target compounds (hydrogen sulfide, methanethiol (MeSH), ethanethiol (EtSH), dimethyl sulfide (Me2S), and dimethyl disulfide (Me2S2)) were extracted

Solid-phase microextraction of methadone in urine samples by electrochemically co-deposited sol-gel/Cu nanocomposite fiber.

Sirwan Mohammadiazar et al.

Biomedical chromatography : BMC, 31(8) (2016-12-31)

Electrochemically co-deposited sol-gel/Cu nanocomposites have been introduced as a novel, simple and single-step technique for preparation of solid-phase microextraction (SPME) coating to extract methadone (MDN) (a synthetic opioid) in urine samples. The porous surface structure of the sol-gel/Cu nanocomposite coating

Fabrication of porous ionic liquid polymer as solid-phase microextraction coating for analysis of organic acids by gas chromatography - mass spectrometry.

Zhentao Tang et al.

Talanta, 172, 45-52 (2017-06-13)

A kind of porous ionic liquid polymer was designed as coating material for solid-phase microextraction (SPME) fibers to extract polar organic acids. The synthesized ionic liquids (1-vinyl-3-(4-vinyl-benzyl)imidazolium chloride) were polymerized in the presence of azobisisobutyronitrile (AIBN), and subsequently coated on

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

Aroma modulation of Cabernet Gernischt dry red wine by optimal enzyme treatment strategy in winemaking.

Wei-Xuan Sun et al.

Food chemistry, 245, 1248-1256 (2017-12-31)

Cabernet Gernischt (CG) is a famous Chinese wine grape cultivar, the red wine of which is known for its green trait, especially when produced from grapes cultivated in regions with monsoon climate. To modify CG wine aroma, three enzyme preparations

Optimization of headspace solid-phase microextraction gas chromatography-atomic emission detection analysis of monomethylmercury.

René Bernard Geerdink et al.

Journal of chromatography. A, 1174(1-2), 7-12 (2007-10-02)

Optimum conditions for headspace solid-phase microextraction (HS-SPME) in the analysis of monomethylmercury (MeHg) have been determined. Sodium tetra(n-)propylborate (NaBPr(4)) is used as derivatization reagent to promote volatility. A simple aluminium bar was used to cool the SPME fiber to about

Efficient and clean pre-concentration of ultra-trace calcium channel blockers from biological matrices via a hyphenated procedure of two sequential dispersive solid/liquid phase microextractions.

Maryam Hemmati et al.

Analytica chimica acta, 960, 138-150 (2017-02-15)

In the present work, we propose a safe, simple, and relatively rapid procedure for the efficient clean-up and pre-concentration of ultra-trace calcium channel blockers (CCBs) from the human plasma and urine samples followed by high performance liquid chromatography-ultraviolet detection. The

Non-destructive profiling of volatile organic compounds using HS-SPME/GC-MS and its application for the geographical discrimination of white rice.

Dong Kyu Lim et al.

Journal of food and drug analysis, 26(1), 260-267 (2018-02-02)

The authenticity determination of white rice is crucial to prevent deceptive origin labeling and dishonest trading. However, a non-destructive and comprehensive method for rapidly discriminating the geographical origins of white rice between countries is still lacking. In the current study

Knitting aromatic polymers for efficient solid-phase microextraction of trace organic pollutants.

Shuqin Liu et al.

Journal of chromatography. A, 1450, 9-16 (2016-05-09)

A series of knitting aromatic polymers (KAPs) were successfully synthesized using a simple one-step Friedel-Crafts alkylation of aromatic monomers and were characterized by transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). Then, as-synthesized KAPs

Screening of Polish Fir Honeydew Honey Using GC/MS, HPLC-DAD, and Physical-Chemical Parameters: Benzene Derivatives and Terpenes as Chemical Markers.

Piotr M Kuś et al.

Chemistry & biodiversity, 14(9) (2017-06-29)

GC/MS of headspace solid phase micro extraction (HS-SPME) and solvent extractives along with targeted HPLC-DAD of Polish fir (Abies alba Mill.) honeydew honey (FHH), were used to determine the chemical profiles and potential markers of botanical origin. Additionally, typical physical-chemical

Fabrication of cross-linked hydrazone covalent organic frameworks by click chemistry and application to solid phase microextraction.

Mingxue Wu et al.

Talanta, 161, 350-358 (2016-10-23)

Covalent organic frameworks (COFs) are an emerging class of porous organic frameworks with diverse promising applications. Herein, we presented the first example of cross-linked hydrazone COFs (cross-linked COFs) coating via thiol-ene click chemistry for solid phase microextraction (SPME). Strong covalent

Magnetic headspace adsorptive extraction of chlorobenzenes prior to thermal desorption gas chromatography-mass spectrometry.

Lorena Vidal et al.

Analytica chimica acta, 971, 40-47 (2017-05-01)

This study presents a new, user-friendly, cost-effective and portable headspace solid-phase extraction technique based on graphene oxide decorated with iron oxide magnetic nanoparticles as sorbent, located on one end of a small neodymium magnet. Hence, the new headspace solid-phase extraction

Determination of aliphatic amines in food by on-fiber derivatization solid-phase microextraction with a novel zeolitic imidazolate framework 8-coated stainless steel fiber.

Jie Huang et al.

Talanta, 165, 326-331 (2017-02-06)

Some harmful aliphatic diamines, e.g., putrescine (Put) and cadaverine (Cad), play important roles in food safety evaluation. In this study, we proposed on-fiber derivatization solid-phase microextraction analysis of non-volatile aliphatic diamines in fish using zeolitic imidazolate framework 8 (ZIF-8) as

Headspace solid-phase microextraction with 1-pyrenyldiazomethane on-fibre derivatisation for analysis of fluoroacetic acid in biological samples.

Frank Sporkert et al.

Journal of chromatography. B, Analytical technologies in the biomedical and life sciences, 772(1), 45-51 (2002-05-23)

A new and in part automated headspace solid-phase microextraction method for quantitative determination of the highly toxic rodenticide fluoroacetic acid (FAA) in serum and other biological samples has been developed. FAA and deuterated acetic acid (internal standard) were extracted from

Optimization and application of headspace-solid-phase micro-extraction coupled with gas chromatography-mass spectrometry for the determination of volatile compounds in cherry wines.

Zuobing Xiao et al.

Journal of chromatography. B, Analytical technologies in the biomedical and life sciences, 978-979, 122-130 (2014-12-30)

A simple, rapid and solvent-free multi-residue method has been developed and applied to confirm and quantify a series of volatile compounds in five cherry wines by gas chromatography coupled with mass spectrometry (GC-MS). Four parameters (e.g., coating material of fiber

Solid-phase micro-extraction-gas chromatography-(tandem) mass spectrometry as a tool for pesticide residue analysis in water samples at high sensitivity and selectivity with confirmation capabilities.

C Gonçalves et al.

Journal of chromatography. A, 1026(1-2), 239-250 (2004-02-07)

Gas chromatography-mass spectrometry (GC-MS) has been widely applied for pesticide monitoring because of its high sensitivity and specificity and for the potential of multi-residue and multi-class analysis. An analytical procedure was developed for the determination of pesticide multi-residues in water

On-line electrochemically controlled in-tube solid phase microextraction of inorganic selenium followed by hydride generation atomic absorption spectrometry.

Hamid Asiabi et al.

Analytica chimica acta, 922, 37-47 (2016-05-08)

In this work, for the first time, a rapid, simple and sensitive microextraction procedure is demonstrated for the matrix separation, preconcentration and determination of inorganic selenium species in water samples using an electrochemically controlled in-tube solid phase microextraction (EC-in-tube SPME)

Use of Pistacia terebinthus resin as immobilization support for Lactobacillus casei cells and application in selected dairy products.

Vasiliki Schoina et al.

Journal of food science and technology, 52(9), 5700-5708 (2015-09-08)

Resin from Pistacia terebinthus tree was used for the immobilization of L. casei ATCC 393 cells. The encapsulated L. casei cells biocatalysts were added as adjuncts during yogurt production at 45 °C and probiotic viability was assessed during storage at 4 °C.

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