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Showing 1 to 20 of 21 for “"solid phase micro extraction"”.

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

    Beukes, James ArthurUniversity of the Western Cape2004

    … cost-efficiency and ease 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, …

    western-cape Repository record

  2. Advances in Solid Phase Microextraction for the Analysis of Volatile Compounds in Explosives, Tire Treatments, and Entomological Specimens

    Kranz, William D.2016

    Solid phase micro-extraction is a powerful and versatile technique, well-suited to the analysis of numerous samples of forensic interest. The exceptional sensitivity of the SPME platform, combined with its adaptability to traditional GC-MS systems and its ability to extract samples with minimal …

    iupui Repository record

  3. Electrochemical Remedy and Analysis for the Environment Based on the New Polymer-DNA Composite Material.

    Hussain, Noor Feuza2005

    … for the first time due to its promise in micro extraction, transfer, and release of cations under controlled potential conditions by using electrochemically assisted solid phase micro extraction (SPME). The Polypyrrole/DNA composite can be formed easily by oxidation of pyrrole monomers in …

    etsu Repository record

  4. Volatile Compounds in Vine Tea (Ampelopsis grossedentata)

    Vieira Carneiro, Renata CarolineVirginia Tech2016

    … vine tea infusions were identified by headspace solid-phase micro-extraction (HS-SPME) and gas chromatography-mass spectrometry (GC-MS). Commercial vine teas samples were brewed with distilled water and Blacksburg (VA, USA) tap water and analyzed in triplicate. Vine tea infusions had acidic pH …

    vt Repository record

  5. Chemical communication in the European otter, Lutra lutra

    Davies, Matthew JohnUniversity of Hull2008

    … and wild animals were analysed using solvent extraction and solid phase micro extraction (SPME). An ageing study (using SPME) mapped spraint chemical composition changes following deposition and how low temperature storage and exposure to the environment affected these changes. Chemicals with …

    hull Repository record

  6. Efficacy of Odor Scavengers in Reducing Odor Compounds in Water, Milk, and Soymilk

    Norton, Jenny LynnVirginia Tech2003

    … of the odor scavengers were determined by use of solid phase micro-extraction gas chromatography (SPME-GC) and sensory evaluation. Hexanal, 2-heptenal, 2-pentanone, and 2,4-nonadienal were spiked at 1,000, 3,000, 30,000, and 300 ppb respectively in all three media. Beta-cyclodextrin, D-sorbitol, …

    vt Repository record

  7. Evaluation of Xanthan/Enzymatically Modified Guar Gum Mixtures in Oil-in-Water Emulsions

    Chityala, Pavan Kumar

    … for creaming, viscosity, particle size, and microstructure to evaluate the physical stability, and peroxide value, TBARS value and GC-MS solid phase micro extraction (SPME) experiments were performed to evaluate the oxidative stability. Emulsions containing XG/EMG gum mixtures exhibited …

    wku-diss Repository record

  8. Decoding the Flavor of Kentucky's Native Pawpaw Fruit

    Roark, Mackenzie Leanne

    … on capillary GC columns with various means of extraction. The volatile compounds present were extracted using both headspace solid phase micro-extraction (HS-SPME) for 30 minutes at 23°C and 50°C, and solvent extraction using methylene chloride. The sample extracts were analyzed with both gas …

    eku Repository record

  9. Antioxidant Protection of an Omega-3 Fatty Acid Fortified Dairy-Based Beverage

    Moore, Robert LeeVirginia Tech2009

    Skim, butter-derived aqueous phase, anhydrous milk fat, and fish oil were used to formulate ultra high temperature (UHT) processed extended shelf-life omega-3 fatty acid fortified dairy-based beverages with fat contents mimicking whole milk (3.25%). Oxidation of the lipids in the formulated …

    vt Repository record

  10. Degradation of Chlorophenols in Swine Waste

    Gangula, Srilatha

    … seven chlorinated phenols in swine waste using solid-phase micro-extraction (SPME) and gas chromatography(GC). Microbes in the waste perform respiration or fermentation to obtain the energy they need to carry out their life processes. Fermentation is a process in which electrons are transferred …

    wku-diss Repository record

  11. Forensic sample analysis using supercritical fluid extraction coupled with solid phase microextraction

    Lee, Emma-Jane2007

    … A new method combining supercritical fluid extraction and solid phase micro-extraction (SFE/SPME) is introduced. This coupled procedure utilises the advantages of using supercritical carbon dioxide as an extraction solvent and collecting the extract on a selected SPME fibre. Together the …

    southwales Repository record

  12. Ice Concentration Linked with Extractive Stirrer (ICECLES)

    Maslamani, Nujud Omar2016

    … of certain analytes. These include liquid-liquid extraction (LLE), solid phase extraction (SPE), solid phase micro extraction (SPME), and stir bar sorpitive extraction (SBSE). Even though these techniques have advantages, some analytes are still extremely difficult to analyse at the trace and …

    sdstate Repository record

  13. Effects of time and temperature during melanging on the volatile profile of dark chocolate

    Clark, Caitlin, author, Stone, Martha, advisor, Miller, Jeffrey, committee member, DiVerdi, Joseph, committee memberColorado State University. Libraries2019

    … in order to determine, via Head Space Solid Phase Micro Extraction (SPME) coupled with GC-MS, which volatile flavor-active compounds are formed or lost during the melanging process and how the time and temperature affect the volatile composition of the chocolate mass. Univariate …

    colostate Repository record

  14. Improving the stability of an oxime based electrochemical microsensor for organo-phosphate vapor detection

    Londono, Nicolas J.University of Illinois at Urbana-Champaign2010

    A micro gas sensor has been developed by our group for the detection of organo-phosphate vapors using an aqueous oxime solution. The analyte diffuses from the high flow rate gas stream through a porous membrane to the low flow rate aqueous phase. It reacts with the oxime PBO …

    uiuc Repository record

  15. Studio di composti bioattivi in Silybum marianum L. e caratterizzazione dei geni coinvolti nella biosintesi dei terpeni

    D'AMANTE, GIUSIUniversità degli studi di Catania2020

    … - GCqMS - of the headspace sampled by solid-phase micro extraction - SPME). Una differente distribuzione dei sesquiterpeni, monoterpeni e terpeni derivati è stata osservata nei differenti tessuti di cardo mariano presi in esame. Il D-Limonene è stato il composto principalmente …

    catania Repository record

  16. Synthesis and stabilization of selected heterocyclic aroma compounds

    Fang, Ming-ChihUniversity of Illinois at Urbana-Champaign2013

    … using two distinctly different volatile extraction/isolation methods: solvent-assisted flavor evaporation (SAFE), and solid-phase micro-extraction (SPME). Results showed that 2,3-diethyl-5-methylpyrazine and 2-ethyl-3,5-dimethylpyrazine had the highest odor-active values among the 13 …

    uiuc Repository record

  17. Microfluidic electrochemical sensors for the selective detection of toxic compounds

    Londono, Nicolas J.University of Illinois at Urbana-Champaign2011

    … based detection chemistries, as well as the micro-fluidic device platforms which enable these sensors to be operated in a practical, effective manner. The majority of the work in this thesis involves an aqueous based chemistry utilizing an oxime reagent for the detection of …

    uiuc Repository record

  18. Dissecting the genetic, physiological and metabolic mechanisms of grapevine resilience to heat stress

    Pettenuzzo, SilviaUniversità degli studi di Trento2024

    … (GC-MS) after a pre-concentration with a solid-phase micro-extraction (SPME) approach. On the other hand, VOCs emission during stress was investigated in controlled conditions thanks to the use of the Closed-Loop Stripping Analysis (CLSA) which allows the collection of VOCs directly …

    trento Repository record

  19. 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

  20. Untersuchungen zur selektiven Anreicherung organischer Schwefelverbindungen aus wäßrigen Proben

    Beiner, KerstinTechnische Universität Dresden

    … erwies sich die Adsorption an Ag2S aus der Gasphase als geeignet. Zur Extraktion mittel- bis schwerflüchtiger Verbindungen wurde eine Festphasenextraktionstechnik an einem mit Blei(II)ionen modifizierten Kationenaustauschermaterial entwickelt. Ein Vergleich beider Techniken erfolgte mit dem …

    qucosa-diss

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