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Inline Filtration for Ion Chromatography
Bernard Sheldon, Thermo Fisher Scientific, Inc.
Filtration can be used to remove contaminating microbes from samples; microbes can change the sample composition by metabolizing select constituents (for example nitrate, nitrite, orthorphosphate, and perchlorate). Filtration for the purpose of sample stabilization should be performed at or immediately after sample collection, and is required by some official methods (ISO 5667-3, EPA 314.1). Read More |
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Accurate and Precise Automated Dilution and In-line Conductivity Measurement Using the AS-AP Autosampler Prior to Analysis by Ion Chromatography
Carl Fisher and Linda Lopez, Thermo Fisher Scientific, Inc.
Ion chromatography (IC) is a well-established method for determination of ionic analytes. Levels of ions can be readily quantified down to parts per trillion (ppt) using suppressed conductivity by a Thermo Scientific Dionex Reagent-Free (RFIC) system. Read More |
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Automated Extraction and Determination of Human Hormones in Drinking Water Using Solid-Phase Extraction and HPLC with UV Detection
Carl Fisher and Linda Lopez, Thermo Fisher Scientific, Inc.
The presence of hormones (from both natural and artificial sources) in drinking water is a human health concern. Safe exposure limits have yet to be determined due to the need for further studies investigating the impact of long-term and synergistic exposure. Read More |
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Simultaneous Determination of Trivalent Chromium and Hexavalent Chromium Using Accelerated Solvent Extraction and Ion Chromatography
Che Jinshui, Hu Zhongyang, Ye Mingli, and Aaron Kettle, Thermo Fisher Scientific, Inc.
Rapid analysis of seven classes of antibiotics from meat products in less than 8 min results in shorter cycle times and improved productivity. Ultra-high efficiency Kinetex core-shell columns provide narrower peaks and increased sensitivity. Read More |
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Determination of Benzenesulfonic Acid Counterion in Amlodipine Besylate by Ion Chromatography
Brian De Borba and Jeffrey Rohrer, Thermo Fisher Scientific, Inc.
Nearly half of all pharmaceuticals are produced in their salt form. Pharmaceutical salt formation is a critical step in the development process to help promote solubility, improve stability, decreased toxicity, and reduce hygroscopicity. Read More |
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Ion Chromatography Assay for Chloride and Sulfate in Adenosine
Lipika Basumallick and Jeffrey Rohrer, Thermo Fisher Scientific, Inc.
Adenosine is a nucleoside composed of adenine attached to ribose in the furanose conformation. The major therapeutic uses of adenosine are for treating surgical and nerve pain, pulmonary hypertension, and irregular heartbeat; for controlling blood pressure during anesthesia or surgery; and for cardiac stress tests. Read More |
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Carbohydrate Determination of Biofuel Samples
Lipika Basumallick and Jeffrey Rohrer, Thermo Fisher Scientific, Inc.
Biofuels (that is, fuels derived from plant materials and animal wastes) have emerged as an attractive alternative to fossil fuel. The cellulosic biomass – the starches and sugars in plant or animal matter – are typically broken down by the application of heat and chemicals (pretreatment) followed by enzymatic digestion and fermentation. Read More |
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Determination of Total Inorganic Arsenic in Fruit Juice Using High-Pressure Capillary Ion Chromatography
Hua Yang, Terri Christison, and Linda Lopez, Thermo Fisher Scientific, Inc.
Growing interest around arsenic (As) determinations in fruit juices has been triggered by media claims of total arsenic concentrations above acceptable limits in apple juice products. Although the FDA has been testing and monitoring fruit juices for arsenic content for more than 20 years and has found that total inorganic arsenic levels in juice are typically low, more recently there has been heightened scrutiny of arsenic in apple juice. Read More |
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Fast Determinations of Lactose and Lactulose in Milk Products Using HPAE-PAD
Terri Christison, Carl Fisher, Hua Yang, and Linda Lopez, Thermo Fisher Scientific, Inc.
Lactose and lactulose are important components in milk-based products. Lactose is the major milk disaccharide which is metabolized with the aid of lactase to the monosaccharides, glucose and galactose. Read More |
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