87 Articles found
Sigma-Aldrich Articles
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A comparison of two solid phase extraction methods for the analysis of Polyaromatic Hydrocarbons in butter
Background Polyaromatic hydrocarbons (PAHs) are ubiquitous in the environment, resulting from both natural and manmade sources of combustion. Farm animals, such as cows, can become exposed to them through both consumption of contaminated feed and ...
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Analysis of Isocyanates using the ASSET EZ4-NCO Dry Sampler
Introduction Isocyanates are used as a raw material to produce a number of products such as automotive paints, rigid and spray foam insulation, and furniture. Personal exposure can occur while the products made with isocyanates are being applied, ...
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SPE Cleanup of Wheat Extracts Prior to the HPLC Analysis of the Mycotoxin Deoxynivalenol
Deoxynivalenol (DON) is a mycotoxin produced by the Fusarium fungal species graminearum and culmorum. These Fusariumfungi infect cereal crops primarily in wet conditions when temperatures range from 15–30 ...
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Better tools for fast and convenient Patulin analysis
Analytical Standards and New SupelMIP SPE Cartridges The mycotoxin patulin is often found in rotten apples. It is mostly produced by Aspergillus, Penicillium and Byssochlamys and shows a variety of short-term and long-term effects in animal ...
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Analysis of Polychlorinated Biphenyls in Fish Oil Using Supelclean EZ-POP NP, Silica Gel SPE, and an SLB-5ms GC Column
Polychlorinated biphenyls (PCBs) were once widely used in many industrial and commercial applications such as insulating fluids, dielectrics, and lubricants. This included their extensive use in electrical transformers. PCB use has been banned in ...
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Improved recoveries and lower background for the analysis of PAHs in Olive Oil
Using Supelclean EZ-POP NP and an SLB-5ms GC Column A recent survey implemented by Supelco revealed that 58% of analytical chemists in the food industry find the analysis of compounds in fatty matrices to be highly problematic. Lipid interferences ...
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News on Food 2013, Volume 2: Simplify Sample Prep, and Increase Speed and Sensitivity
Analytical testing is used 1) to determine nutritional value and quality and 2) to ensure food safety and security. We have developed and continue to develop, specialized products that allow food analysts to simplify sample prep, and increase speed ...
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News on Food 2013, Volume 1: Food Safety and Food Chemistry of Fat Matrices
Analytical testing is used in the production of worldwide food supply from raw materials and ingredients, to finished and packaged goods. This testing primarily serves two purposes: to determine nutritional value and quality, and to guarantee ...
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News on Air 2014, Volume 1: Thermal Desorption - Selecting Your Adsorbent Tube
Thermal Desorption - which tube and which adsorbent do I need? Supelco produces a comprehensive selection of adsorbent tubes. Selection of the proper adsorbent(s) is critical to achieving the best results for a thermal desorption application. An ...
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News on Air 2013: Special Edition for Petrochemical Industry
This volume features Air Monitoring products that are used the petrochemical industry to ensure worker and community safety. Supelco's air monitoring products are useful for sampling of indoor (workplace) air and ambient air for a wide ...
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News on Air 2013, Volume 3: Products for Analysis and Quantification
Welcome to the third volume of our News On Air bulletin. This edition focuses on the often overlooked and neglected, but one of the most crucial steps in the analytical workflow: selecting the correct reagents and analytical reference materials for ...
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News on Air 2013, Volume 2: Products for Separation
Supelco® has developed the most extensive line of special purpose columns designed for industry specific applications; including environmental and industrial hygiene. These columns are manufactured to deliver high resolution, great analyte ...
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News on Air 2013, Volume 1: Products for Sampling
For decades, Sigma-Aldrich has been a key supplier of innovative & high technology air monitoring products for various areas of gas/air sampling. Enclosed, you will find an overview on new and interesting devices to improve or simplify your air ...
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News on Air 2013, Volume 4: Labware and Reagents
Welcome to volume 4 of our News on Air bulletin. This edition focusses on some of the labware and reagents that are used in this challenging area of analysis. Success in air monitoring quantitation requires that all the equipment and reagents used ...
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Sampling of Carbonyls Using a Dual-Layer LpDNPH Glass Sampling Tube and HPLC Analysis
The dual-layer LpDNPH sorbent tube is an air sampling device designed for sampling carbonyls (e.g. formaldehyde) in ambient, indoor, and industrial atmospheres. Carbonyls are trapped on our high-purity silica gel adsorbent coated with ...
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Extraction & Analysis of PAHs in Olive Oil Using SupelMIP SPE – PAHs and GC-MS
Polyaromatic hydrocarbons (PAHs) consist of fused aromatic rings and are formed as a by-product during the combustion of fuels. Seven PAHs in particular are known for their carcinogenic properties: benz[a]anthracene, benzo[a]pyrene, ...
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Detection of Low Level of Chloramphenicol in Milk and Honey with MIP SPE and LC-MS-MS
The analysis of chloramphenicol(CAP) is a challenging analysis for drug residues in food matrices. Chloramphenicolis an antibiotic that is effective against a wide range of gram positive and gram negative bacteria in both humans and animals, ...
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SupelMIP SPE for Sample Cleanup and Analysis of Food and Environmental Contaminants
MIP SPE was successfully used for extraction of multiple classes of food and environmental contaminants from difficult matrices, such as egg, oil and flour. • Six nitroimidazoles were extracted from egg and milk with recoveries typically over ...
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GC Determination of Benzene in Reformulated Gasoline using a Supelco SLB-IL111 Ionic Liquid Column
The amount of benzene in gasoline is a concern because it is a known human carcinogen, and exposure to it has been linked to detrimental health effects. The challenge with the analysis lies in the complex composition of gasoline, which ...
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Analysis of US EPA Method 8270D Semivolatiles Using a 30 m x 0.25 mm I.D., 0.50 μm SLB-5ms
Application Note 401: US EPA Method 8270D specifies a procedure for the determination of semivolatiles in solid waste and ground water samples. The long list of analytes includes compounds of a variety of functionalities. A 0.25 μm df column is ...