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Showing 1 to 20 of 131 for “"SPME"”.

  1. Extraction of alcohols from gasoline using solid phase microextraction (SPME)

    Stadelmann, Iris PatriciaVirginia Tech2001

    … EtOH in gasoline by solid phase microextraction (SPME). The major problem in quantifying EtOH in gasoline is the coelution of hydrocarbons with EtOH. There have been several approaches to solve this problem; among the chromatographic ones, three major types have been proposed: (1) the first one …

    vt Repository record

  2. Multi-scale electrochemical-thermal modelling of a sodium-ion battery cell using the SPMe with a lumped thermal model

    Patel, Sana2026

    … on the Single Particle Model with electrolyte (SPMe) coupled with a lumped thermal model and implemented in PyBaMM. The simulations were conducted across C-rates, ranging from C/15 to 3C and temperatures from -20 °C to 55 °C, to analyze voltage profiles, capacity retention, thermal response, and …

    venda Repository record

  3. The Effect of Wine Matrix Ingredients on 3-Alkyl-2-methoxypyrazines Measurements by Headspace Solid-Phase Microextraction (HS-SPME)

    Hartmann, Peter J.Virginia Tech2002

    … investigated with solid-phase microextraction (SPME) and capillary gas chromatography, using a nitrogen phosphorus detector. Changes in the recovery of 3-ethyl-, isopropyl-, sec-butyl-, and isobutyl-2-methoxypyrazines from the static headspace of synthetic wine matrices spiked with 5mg/L of each …

    vt Repository record

  4. Profiling and putative aroma biomarker identification for flavor in potatoes using a trained sensory panel and HS-SPME GC-MS

    Bough, Raven, author, Jayanty, Sastry, advisor, Holm, David G., advisor, Stone, Martha, committee memberColorado State University. Libraries2017

    … chromatography coupled to mass spectrometry (HS-SPME GC-MS) facilitated identification of 42 unique metabolites with significant variation across samples (ANOVA, α=0.05, n=5 technical replicates x 14-15 clones x 2 cooking methods). Based on Spearman's rank correlations, hierarchical clustering …

    colostate Repository record

  5. Estudo dos compostos voláteis de algumas espécies de eucalipto através do uso de microextração em fase sólida no modo headspace (HS-SPME)

    Zini, Claudia Alcaraz2002

    Neste trabalho utilizou-se a técnica de HS-SPME/GC/ITMS para o estudo qualitativo dos compostos voláteis (VOC) emitidos pelas folhas de três espécies de Eucalyptus (E.): E. citriodora, E. dunnii e E. saligna tanto em laboratório como in situ, além do estudo da relação entre folhas de eucalipto e …

    brazil-ufrgs Repository record

  6. Characterization of human skin emanations by Solid Phase Microextraction (SPME) extraction of volatiles and subsequent analysis by Gas Chromatography-Mass Spectrometry (GC-MS)

    Akin James (James J.)Massachusetts Institute of Technology2005

    An experimental study was performed to develop and validate a collection and analysis protocol for human skin emanations. The protocol developed included the rubbing of glass beads on the palms and backs of hands for 20 minutes. The volatile headspace above samples were extracted by a solid-phase …

    mit Repository record

  7. Development of a headspace solid-phase microextraction (HS-SPME) procedure for the determination of short-chain fatty acids (SCFAs) in activated sludge by GC-FID

    Cheng, Shiyan

    <p>The process of wastewater treatment includes the removal of inorganic solids such as sand and gravel as well as organic materials, phosphorus, and nitrogen. Activated sludge, containing a variety of living organisms, is added into the wastewater treatment system. Short-chain fatty acids (SCFAs), …

    emich Repository record

  8. Sample Preparation/Concentration for Trace Analysis in GC/MS (A study of solid phase microextraction and headspace sampling)

    Wang, YuwenVirginia Tech1997

    Solid Phase Microextraction (SPME) associated with Microwave Assisted Extraction (MAE)<sup>(1-3)</sup> , on-line headspace derivatization <sup>(4-6)</sup> and the selectivity of different SPME coatings <sup>(7)</sup> were studied. Trace amounts of Veltol ®, Veltol Plus® and short chain fatty acids …

    vt Repository record

  9. What is the best chemical approach to estimate the bioavailability of pyrethroid insecticides to benthic invertebrates?

    Harwood, Amanda D.

    … applicable. Solid phase microextraction (SPME) and Tenax are two commonly used bioavailability-based methods. While both SPME fiber and Tenax extractable concentrations can be correlated to tissue residues of aquatic species, the majority of this research (with a few exceptions) focuses on …

    siu-theses Repository record

  10. Extending the Limits of Solid Phase Microextraction

    Chopra, Shilpi2015

    <p>Solid phase microextraction (SPME) is a solventless extraction technique that combines sample preparation and sample introduction into a gas chromatograph into a single step. For the past 20 years, solid-phase micro-extraction (SPME) has been used in numerous fields such as: food analysis, …

    shu-thes Repository record

  11. Predicting the bioavailability and toxicity of hydrophobic pesticides using bioassays and a solid phase microextraction approach

    Ding, Yuping

    … in risk assessment. Solid phase microextraction (SPME) is an equilibrium partitioning technique that has been successfully used to estimate body residues by measuring the freely dissolved chemical concentration and assessing chemical bioavailability in exposure media. The objectives of this …

    siu-theses Repository record

  12. Solid phase micro extraction: an alternative technique for the determination of volatile orgnanic compounds in groundwater

    Beukes, James ArthurUniversity of the Western Cape2004

    … of automation: The solid phase micro extraction (SPME) process has two steps: partitioning of analytes between the coating of a SPME fibre and the sample matrix, followed by desorption of concentrated extracts directly into an analytical instrument. In the first step, the coated fibre is exposed …

    western-cape Repository record

  13. Effect of Foliar Nitrogen and Sulfur Applications on Aroma Profile of Vitis vinifera L. cv. Petit Manseng using Modified Quantitative Descriptive Analysis, SPME GC-MS and Electronic Nose Technology

    Kelly, Molly KathleenVirginia Tech2013

    … fractions. Solid phase microextraction (SPME) and gas chromatography-mass spectrometry (GC/MS) analysis identified 27 free aroma and flavor compounds and 52 bound compounds. Lactones and carboxylic acids were the major components of the free fractions while bound fractions had increased …

    vt Repository record

  14. DEVELOPMENT AND APPLICATION OF MINIATURIZED SAMPLE PREPARATION TECHNIQUES COMBINED WITH GAS CHROMATOGRAPHY-MASS SPECTROMETRY IN ENVIRONMENTAL ANALYSIS

    ZHANG HONG2011

    … in a variation of solid-phase microextraction (SPME), which was assembled with a commercially-available plunger-in-needle microsyringe, in which the plunger was coated with graphene. With this setup, a ready-made SPME device resembling a commercial system, was conveniently devised. A …

    nus Repository record

  15. Identification of Tobacco-Related Compounds in Tobacco Products and Human Hair

    Rainey, Christina2014

    … and headspace solid phase microextraction (SPME) with analysis by gas chromatography-mass spectrometry (GC-MS). The results show that the compounds present are nicotine, flavoring compounds, humectants and binders. Humectant concentrations vary among different tobacco types depending on the …

    iupui Repository record

  16. Effects of water chemistry and panning on flavor volatiles and catechins in teas (Camellia sinensis)

    Sheibani, ErshadVirginia Tech2014

    … (solvent and time) and to compare SDE with SPME for the isolation of flavor compounds in Jin Xuan oolong tea using Gas Chromatography- Mass Spectrometry (GC-MS) and Gas Chromatography- Olfactrometry (GC-O). The concentration of volatile compounds isolated with diethyl ether was higher …

    vt Repository record

  17. Stanovení obsahových látek ve fytofarmakách

    Ivanishchanka, IrynaVysoké učení technické v Brně. Fakulta chemická

    … rozpouštědlem, mikroextrakce tuhou fází (SPME) a destilace vodní parou, a k identifikaci byla použita plynová chromatografie (GC/MS). Izolační metody pro získání silic z rostlinných matric byly posouzeny a jako nejvhodnější izolační technika byla určena metoda mikroextrakce tuhou fází …

    brno-tech Repository record

  18. Gas Chromatography: Mass Spectrometry of Chemical Agents and Related Interferents

    Zhai, Lailiang2006

    … (GC-MS) system with solid phase microextraction (SPME) sampling for point detection of chemical agents. The objective is to minimize the analysis time between sampling and detection of a potential chemical threat. SPME offers a convenient means for sampling gaseous and liquid samples, …

    byu Repository record

  19. Detection of Illicit Drugs in Various Matrices Via Total Vaporization Solid-Phase Microextraction

    Davis, Kymeri Elizabeth2019

    … Headspace Solid-Phase Microextraction (Headspace SPME), a sample is heated to encourage a portion of the analyte into the headspace of a vial. A coated fiber is introduced into the sample headspace and the analyte is adsorbed onto the fiber coating. Total Vaporization Solid-Phase Microextraction …

    iupui Repository record

  20. Solid phase microextraction of amino-dinitrotoluenes in tissue.

    Tsui-Bowen, AletheaUniversity of North Texas2004

    … and tissues. Solid phase microextraction (SPME) was used to extract ADNTs (amino-dinitrotoluenes) from tissue as a potential method to investigate the recalcitrance of metabolically-generated ADNTs versus absorbed ADNTs. Tubifex tubifex was allowed to metabolize TNT into ADNTs in 24-hr …

    unt Repository record

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