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Showing 1-30 of 2111 results for "57342-U" within Papers
Elahe Kazemi et al.
Talanta, 141, 273-278 (2015-05-13)
A selective, simple and rapid dispersive solid phase microextraction was developed using magnetic graphene oxide (MGO) as an efficient sorbent for the separation and preconcentration of gold ions. The MGO was synthesized by means of the simple one step chemical
Mona Syhre et al.
Medical mycology, 46(3), 209-215 (2008-04-12)
Our objective was to identify, for diagnostic purposes, potential volatile biomarkers of human microbial pathogens. We analysed the head space of cultures of medically important bacterial and fungal respiratory pathogens for 2-Pentylfuran (2PF) production through the use of Solid Phase
Saeedeh Ansari et al.
Talanta, 164, 612-625 (2017-01-22)
The quantification of drugs in biological samples is a significant task for determination of the physiological efficiency in evaluated drugs in the drug discovery. To analysis of the chemical compounds at the trace and ultratrace levels, adequate analytical procedures should
Paulina Wiśniewska et al.
Critical reviews in analytical chemistry, 45(3), 201-225 (2015-04-08)
Spirit-based beverages are alcoholic drinks; their production processes are dependent on the type and origin of raw materials. The composition of this complex matrix is difficult to analyze, and scientists commonly choose gas chromatography techniques for this reason. With a
Rachael E Dack et al.
Food chemistry, 232, 595-601 (2017-05-12)
The effect of Maillard reaction products (MRPs), formed during the production of dark malts, on the synthesis of higher alcohols and esters in beer fermentations was investigated by headspace solid-phase microextraction GC-MS. Higher alcohol levels were significantly (p<0.05) higher in
Hana Vlčková et al.
Bioanalysis, 8(4), 333-349 (2016-02-10)
Statins are the microsomal 3-hydroxy-3methylglutaryl-coenzyme A reductase inhibitors used for the treatment of hypercholesterolemia. Some recent studies revealed also the extra-lipid effects and anticancer activities. Due to the wide incidence of cancer diseases, the number of studies dealing with anticancer
Frank David et al.
Journal of chromatography. A, 1152(1-2), 54-69 (2007-01-24)
Stir bar sorptive extraction (SBSE) was introduced in 1999 as a solventless sample preparation method for the extraction and enrichment of organic compounds from aqueous matrices. The method is based on sorptive extraction, whereby the solutes are extracted into a
A Ribeiro et al.
Journal of chromatography. A, 975(2), 267-274 (2002-11-29)
Landfill leachates represent a serious environmental concern with regard to trace priority pollutants introduced into the aquatic environment. From the analytical point of view, they constitute complex matrices because of their high organic matter content and competition with the trace
Tamires Amabile Valim Brigante et al.
Journal of chromatography. B, Analytical technologies in the biomedical and life sciences, 1067, 25-33 (2017-10-07)
Molecularly imprinted polymers (MIPs) were synthesized and used as sorbent for Bisphenol A (BPA) pipette tip solid-phase microextraction from urine samples and BPA analysis by gas chromatography coupled to mass spectrometry (GC-MS). The MIPs were synthesized by the sol-gel methodology.
Federico Ferrari et al.
Analytical and bioanalytical chemistry, 379(3), 476-483 (2004-04-16)
An analytical method is described for assessing the vapour concentration of 11 pesticides (bioallethrin, chlorpyriphos methyl, folpet, malathion, procymidone, quintozene, chlorothalonil, fonofos, penconazole and trimethacarb) in confined atmospheres (e.g. a greenhouse after pesticide application). This study is a successful extension
A Lopez et al.
Chemosphere, 45(3), 269-274 (2001-10-11)
The present paper deals with the formation of volatile halogenated by-products (POX) during the chlorination (160 mg/l) of aqueous solutions of the herbicide isoproturon (40 mg/l). Chlorination reactions have been carried out over 48 h, at ambient temperature, at two
Juan Zhang et al.
Journal of chromatography. A, 1530, 1-18 (2017-11-19)
Metal-organic frameworks (MOFs) as a subclass of coordination polymers, have attracted wide interest in various field. Herein, we focus on its application in chromatographic separation due to its excellent physical and chemical properties such as large surface area, high porosity
Bas Vriens et al.
Journal of chromatography. A, 1407, 11-20 (2015-07-08)
Biologically produced volatile-alkylated Se and S compounds play an important role in the global biogeochemical Se and S cycles, are important constituents of odorous industrial emissions, and contribute to (off-)flavors in food and beverages. This study presents a fully automated
Rossana Coda et al.
International journal of food microbiology, 155(3), 120-127 (2012-02-22)
Cereal (rice, barley, emmer and oat) and soy flours and concentrated red grape must were used for making vegetable yogurt-like beverages (VYLB). Two selected strains of Lactobacillus plantarum were used for lactic acid fermentation, according to a process which included
Laurent Dagan et al.
Analytica chimica acta, 821, 48-53 (2014-04-08)
The 4-mercapto-4-methylpentan-2-one (4MMP) is a key aroma compound in wines, especially in Sauvignon Blanc ones. Its accurate quantification is quite difficult due to its traces levels and its reactivity in wine conferred by the thiol function. In this paper, we
Miao Pei et al.
Talanta, 165, 152-160 (2017-02-06)
A multiple monolithic fiber solid-phase microextraction (MMF-SPME) utilizing polymeric ionic liquid-based adsorbent was prepared. The adsorbent was obtained by in situ copolymerization of an ionic liquid, 1-trimethyl-(4-vinylbenzyl) aminium chloride and dual cross-linkers (divinylbenzene and ethylenedimethacrylate). The effect of preparation conditions
Mingxue Wu et al.
Journal of chromatography. A, 1456, 34-41 (2016-06-19)
We designed a novel hydrazone covalent organic framework (COF) and developed a polydopamine (PDA) method to immobilize COF on a stainless steel fiber for headspace solid-phase microextraction (HS-SPME). A series of characterization studies was performed to validate the structure and
Juanjuan Feng et al.
Journal of separation science, 40(24), 4773-4779 (2017-10-19)
An in-tube solid-phase microextraction device was developed by packing poly(ionic liquids)-coated stainless-steel wires into a polyether ether ketone tube. An anion-exchange process was performed to enhance the extraction performance. Surface properties of poly(ionic liquids)-coated stainless-steel wires were characterized by scanning
Min He et al.
Journal of chromatography. B, Analytical technologies in the biomedical and life sciences, 1079, 41-50 (2018-02-14)
Head Space/Solid Phase Micro-Extraction (HS-SPME) coupled with Gas Chromatography/Mass Spectrometer (GC/MS) was used to determine the volatile/heat-labile components in Ligusticum chuanxiong Hort - Cyperus rotundus rhizomes. Facing co-eluting peaks in k samples, a trilinear structure was reconstructed to obtain the
Nawaporn Lapsongphon et al.
Journal of agricultural and food chemistry, 63(10), 2628-2638 (2015-03-03)
Comprehensive analysis of the potent odorants in Thai premium fish sauce samples was accomplished by use of complementary volatile isolation methods combined with gas chromatography-olfactometry (GC-O) and GC-mass spectrometry. Odorants of intermediate and low volatility were determined by direct solvent
Yanqin Yang et al.
Journal of separation science, 39(21), 4192-4201 (2016-09-20)
A novel infrared-assisted extraction coupled to headspace solid-phase microextraction followed by gas chromatography with mass spectrometry method has been developed for the rapid determination of the volatile components in tobacco. The optimal extraction conditions for maximizing the extraction efficiency were
Liu Yang et al.
Journal of separation science, 39(8), 1518-1523 (2016-02-24)
Microextraction by packed sorbent, a miniaturized form of the solid-phase extraction, is a new sample pretreatment technology mainly used for bioanalysis. In this work, self-made device was fabricated by packing C18 sorbent into a microinjection needle (50 μL) and then
Kai Yao et al.
Journal of chromatography. B, Analytical technologies in the biomedical and life sciences, 1003, 67-73 (2015-09-29)
A sensitive, selective and reproducible immunoaffinity stir bar sorptive microextraction (SBSME) coupled with liquid chromatography-fluorescence method for determination of 11 quinolones (QNs) in bovine milk was developed and validated. It is first report of a broad-specificity monoclonal antibody to QNs
Anna Petruczynik et al.
Acta poloniae pharmaceutica, 74(2), 331-346 (2018-04-07)
The review of the RP HPLC analysis of basic psychotropic drugs is presented. It contains sample preparation methods with centrifugation, protein precipitation, liquid-liquid extraction (LLE), dispersive liquid-liquid microextraction (DLLME), solid-phase extraction (SPE), solid-phase microextraction (SPME), microwave-assisted extraction (MAE) and RP-HPLC
Mohammad Saraji et al.
Journal of chromatography. A, 1460, 33-39 (2016-07-28)
In this paper, a mesoporous carbon-ZrO2 nanocomposite was fabricated on a stainless steel wire for the first time and used as the solid-phase microextraction coating. The fiber was synthesized with the direct carbonization of a Zr-based metal organic framework. With
Pallavi Mohekar et al.
Journal of agricultural and food chemistry, 65(4), 872-878 (2017-01-10)
Brown marmorated stink bugs (BMSB) release stress compounds, tridecane and (E)-2-decenal, that affect final wine quality. This study focuses on determining the effect of wine processing on (E)-2-decenal and tridecane release in both red and white wines. Wines were produced
Takahiko Kusakabe et al.
The Tokai journal of experimental and clinical medicine, 28(3), 131-138 (2004-04-02)
A sensitive, specific, and reproducible capillary gas chromatography (GC) with micro-electron capture detection (micro-ECD) method using headspace solid-phase micro-extraction (HS-SPME) for the quantitative analysis of p,p'-DDE in rat whole blood and hair was developed. A 100 microm polydimethylsiloxane (PDMS) phase
Satoshi Mochizuki et al.
FEBS letters, 590(7), 1017-1027 (2016-03-19)
Plants biosynthesize a variety of bioactive lipid derivatives, such as green leaf volatiles (GLVs) and jasmonates (JAs). Here we identify a lipoxygenase 2 (LOX2) involved in GLV biosynthesis in Arabidopsis using mutant lines for each of the six LOX isoforms
Adriana Neves Dias et al.
Analytica chimica acta, 888, 59-66 (2015-09-01)
This study describes the use of cork as a new coating for bar adsorptive microextraction (BAμE) and its application in determining benzophenone, triclocarban and parabens in aqueous samples by HPLC-DAD. In this study bars with 7.5 and 15 mm of
Juan Sánchez-González et al.
Analytical and bioanalytical chemistry, 409(5), 1207-1220 (2016-11-07)
A molecularly imprinted polymer (MIP) selective for cannabinoids [Δ
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