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Showing 1 to 20 of 158 for “"solid 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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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
… for protein 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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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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Chemically modified polymeric resins for high performance liquid chromatography, solid-phase extraction and organic separation by LC and GC
… easily 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 …
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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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Determination of Rifapentine and 25-O-desacetyl Rifapentine from 100 µl human breastmilk by LC-MS/MS using protein precipitation and solid phase extraction
… and validated according to FDA guidelines. The extraction method consisted of a combination of protein precipitation and C18 solid phase extraction. Rifapentine and 25-O-desacetyl rifapentine showed no significant carry over on the Agilent autosampler. The method was reproducible when analysed …
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Development of a liquid-liquid, solid-phase extraction (SPE), LC-MS/MS analytical method for qualitative and quantitative drug residue analysis in white-tailed deer
In Texas, white-tailed deer farming is an established and growing industry. Owners and managers struggle with animal health problems within the deer industry; as a result, veterinary drugs are used. The administration of antibiotics for treatment of infectious diseases may lead to residues in …
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Evaluation of SPEC®•Microcolumns for the extraction of ranitidine from urine
Solid phase extraction (SPE) has become a popular sample preparation method for the extraction of analytes from complex matrices. Solid phase extraction overcomes such disadvantages as large solvent usage and waste, large amounts of time spent in sample preparation and labor intensive methods with …
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