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Showing 1 to 13 of 13 for “"Solid phase micro extraction (SPME)"”.
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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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Solid phase micro extraction: an alternative technique for the determination of volatile orgnanic compounds in groundwater
… 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, …
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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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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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Degradation of Chlorophenols in Swine Waste
… 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 …
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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
… 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 …
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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 …
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Synthesis and stabilization of selected heterocyclic aroma compounds
… 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 …
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Microfluidic electrochemical sensors for the selective detection of toxic compounds
… 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 …
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Dissecting the genetic, physiological and metabolic mechanisms of grapevine resilience to heat stress
… (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 …
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Extending the Limits of Solid Phase Microextraction
<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, …
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Development of new tools for the agroindustrial effluent control : risk-hazard quantitation
… tres objetivos: seleccionar una fibra de micro-extracción en fase sólida (SPME) capaz de extraer un elevado número de sustancias; comprobar la capacidad del SPME junto con la cromatografía de gases y espectrofotometría de masas (GC/MS) como método de rastreo de contaminantes; y por último, …