Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 26 for “"micro-extraction"”.
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Solid phase micro extraction: an alternative technique for the determination of volatile orgnanic compounds in groundwater
… 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, the coated …
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Electrochemical Remedy and Analysis for the Environment Based on the New Polymer-DNA Composite Material.
… 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 …
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Advances in Solid Phase Microextraction for the Analysis of Volatile Compounds in Explosives, Tire Treatments, and Entomological Specimens
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 …
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Analysis of antibiotics and PFAS as potential emerging pollutants in the water bodies and their accumulation in food samples
… on the application of miniaturised liquid phase extraction techniques used for extraction of antibiotics in environmental water samples. In this book chapter, the use of liquid-liquid extraction techniques was discussed and the evolution of liquid-liquid extraction technique into miniaturised …
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Ionic Liquids in Micro Extractions and Gas Chromatographic Stationary Phases
… <p>Ionic liquid–static headspace single drop micro extraction (IL-SHS SDME) involving three phase equilibrium was performed to extract aromatic hydrocarbons from water. A quick extraction was performed by taking the analyte in a 2 ml vial with o.5 ml headspace volume. Two ionic liquids, …
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Volatile Compounds in Vine Tea (Ampelopsis grossedentata)
… 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 values and …
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Creating a Map for Surgeons: Direct Blotting Assisted Stamping of Tissue for MALDI Imaging Mass Spectrometry
… C-18 and poly-lysine functionalized, laser micromachined surface energy traps (SETs), micro-biopsy needle arrays and micro-solvent extraction arrays. Micro-solvent extraction arrays have been shown to successfully image tissue surrogates and preliminary results show the ability to extract …
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Chemical communication in the European otter, Lutra lutra
… 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 …
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Efficacy of Odor Scavengers in Reducing Odor Compounds in Water, Milk, and Soymilk
… 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, and nylon 6 …
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Evaluation of Xanthan/Enzymatically Modified Guar Gum Mixtures in Oil-in-Water Emulsions
… 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 …
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Decoding the Flavor of Kentucky's Native Pawpaw Fruit
… 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 …
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Antioxidant Protection of an Omega-3 Fatty Acid Fortified Dairy-Based Beverage
… diene analysis, and headspace solid phase micro-extraction GC/MS (SPME-GC/MS) analysis of headspace. Omega-3 fatty acid fortified dairy-based beverages were produced that mimicked the physical properties of 3.25% fat whole milk. Oxidation resulted in only small changes in omega-3 lipid …
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Application of whole-cell biosensor for the impact of crude oil exploration on the environment of the Niger Delta
… of crude oil contamination via biological- phase micro-extraction and bios-sensing (BPME-BS) in the Niger Delta environment have been applied with significantly positive results. Consequently, the novel magnetic nanoparticle-mediated isolation (MMI) technology was tested on Nigerian soils for the …
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Application of whole-cell biosensor for the impact of crude oil exploration on the environment of the Niger Delta
… of crude oil contamination via biological- phase micro-extraction and bios-sensing (BPME-BS) in the Niger Delta environment have been applied with significantly positive results. Consequently, the novel magnetic nanoparticle-mediated isolation (MMI) technology was tested on Nigerian soils for the …
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Degradation of Chlorophenols in Swine Waste
… 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 from one …
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Forensic sample analysis using supercritical fluid extraction coupled with solid phase microextraction
… 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 …
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Ice Concentration Linked with Extractive Stirrer (ICECLES)
… 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 …
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Effects of time and temperature during melanging on the volatile profile of dark chocolate
… 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 statistical …
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Improving the stability of an oxime based electrochemical microsensor for organo-phosphate vapor detection
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 …
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Studio di composti bioattivi in Silybum marianum L. e caratterizzazione dei geni coinvolti nella biosintesi dei terpeni
… 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 identificato nei …
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