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Showing 1 to 20 of 168 for “"Phase extraction"”.
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Pseudostationary Phase for Solid Phase Extraction
A unique pseudostationary phase for Solid Phase Extraction is presented. This pseudostationary phase consists of surfactant, which is initially immobilized onto hydrophilic cation exchange resin. The surfactant chain through hydrophobic interactions extracts hydrophobic analytes in the same manner …
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APPLICATION OF LAYERED DOUBLE HYDROXIDES IN SOLID-PHASE EXTRACTION
In various sample preparation methods, solid-phase extraction (SPE) is one of the most popular techniques. It has been in use for many decades and yet is able to meet new challenges, such as minimization solvent and sorbent specifically and improvement in the work flow of laborious operations. …
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Lysozyme Separation from Tobacco Extract by Aqueous Two-Phase Extraction
… for down-stream processing. Aqueous two-phase extraction (ATPE) has been used in purifying proteins from various sources. It is a protein-friendly process and can be scaled up easily. ATPE was studied for its applicability to recombinant protein purification from tobacco using egg white …
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Electrically Controlled Formation and Release of Admicelles for Solid Phase Extraction
<p>Solid phase extraction is one of the most widely used methods to concentrate diluted compounds in a solution. Substances can be extracted into admicelles and hemimicelles, which are surface adsorbed micelles and surfactant monolayers, respectively. Investigations of the electrical control of …
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Comparison of Liquid-Liquid Extraction and Solid Phase Extraction of Mephedrone
… experiment focused on comparing liquid-liquid extraction to solid phase extraction to determine if there was a difference and which was more efficient. Synthetic urine samples were spiked with mephedrone, extracted using both methods, and analyzed with GC-MS. Spiked synthetic urine samples were …
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Silica Based Solid Phase Extraction Sorbent with a Removable Alkyltrimethylammonium Surfactant Phase
Presented is a solid phase extraction (SPE) sorbent having a removable "stationary phase." This removable phase that consists of alkyltrimethylammonium surfactant is initially immobilized onto hydrophilic strong cation exchange resin. The surfactant chain through hydrophobic interactions extracts …
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Analysis of disinfection by products in drinking water by solid phase extraction
… were to develop a broad spectrum method for the extraction, concentration, and analysis of drinking water disinfection by products using solid phase extraction (SPE), and to determine if this method had lower detection limits and less variability than the proposed liquid-liquid extraction method, …
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Novel customisable phases for micro solid-phase extraction and automated biological sample preparation
… biomarker quantification using micro-solid-phase extraction (µSPE) technology through the development of a micro-immobilised-enzyme reactor (IMER) and a µSPE immunoaffinity cartridge to alleviate sample preparation bottlenecks caused by conventional ~18-hour digestions. A novel and …
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Separation of Recombinant β-Glucuronidase from Transgenic Tobacco by Aqueous Two-Phase Extraction
… tobacco with high yield and purity. Aqueous two-phase extraction (ATPE) is a powerful technique for separation and purification of proteins, and has the potential to replace an expensive chromatography step for the initial purification of recombinant proteins. ATPE enables high levels of target …
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Admicelle-Based Solid Phase Extraction of Phenols Using Dialkylammonium Surfactant in the Hydroxide Form
A technique for admicelle-based solid phase extraction is presented in which a dialkylammonium surfactant in the hydroxide form is immobilized on silica. By converting dihexadecyldimethylammonium bromide to the hydroxide form, the surfactant is allowed to have the property of a strong base, aiding …
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Coupled solid phase extraction-supercritical fluid extraction on-line gas chromatography of explosives from water
A method has been developed for the quantitative extraction of nitrotoluenes (2,6-dinitrotoluene, 2,4-dinitrotoluene, and trinitrotoluene) from water. Three types of solid sorbents were investigated: two 47 mm Empore disks™ - octadecylsilane (C18) and styrene-divinylbenzene (SDVB); and one …
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Application of organic acid functionalized cellulose for batch and aqueous two-phase extraction of sulfonamides from different matrices
… cellulose was 25°C, 180 min and 5 mg and with extraction efficiency of 70 and 51%, respectively. The optimal conditions for adsorption of sulfachloropyradazine and sulfabenzamide using oxalic acid functionalized cellulose was 25°C, 30 min and 50 mg with extraction efficiency of 64 and 75%, …
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Chemically modified polymeric resins for high performance liquid chromatography, solid-phase extraction and organic separation by LC and GC
… wetted by water. They are excellent for solid-phase extraction (SPE), especially for polar compounds such as phenols. The recoveries of phenols and multihydroxy phenols are overwhelmingly higher than those obtained using commercial SiC[subscript]18. An HPLC system with a minicolumn (4.0 x 4.0 …
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The characterization of silica-based sorbents in reversed phase liquid chromatography with application to method development in solid-phase extraction
Despite the wide application of solid-phase extraction (SPE) in the environmental, clinical and pharmaceutical fields, method development for this technique has remained largely an empirical process of trial and error. In an effort to provide a systematic approach to method development, the kinetic …
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Comparison of Supported Liquid Extraction and Solid Phase Extraction of Methamphetamine from Urine and Method Validation by Gas Chromatography-Mass Spectrometry
<p>Applications of SLE (supported liquid extraction) is a relatively new extraction technique that is not widely used in forensic toxicology. SLE is also easier and less time consuming than traditional LLE (liquid-liquid extraction) and SPE (Solid phase extraction). This work will compare the …
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Separation and quantification of fourteen chemical forms of fat soluble vitamins in food matrices using solid phase extraction coupled with liquid chromatography – mass spectrometry
A solid-phase extraction (SPE) method was developed for separation and quantification of vitamin A (retinol, beta-carotene, retinyl-palmitate, retinyl-acetate), vitamin D (D2, D3), vitamin E (alpha,beta,gamma,delta tocopherols, tocopheryl-acetate), and vitamin K (K1, K2, K3) from different food …
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Investigations into the extraction and the determination of polycyclic aromatic hydrocarbons (PAHs) from water by solid-phase extraction and capillary gas chromatography/ mass spectrometry
… column temperature depending on the stationary phase employed. In the case of DB5, only the earlyeluted PAHs were affected; whereas, with DB1, all PAHs were affected. An analytical procedure utilizing solid phase extraction with bonded phase silica (C8) cartridges combined with GC/MS was …
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