Sigma-Aldrich articles

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, or when the materials are removed by grinding or thermal degradation. Workers who are exposed to these compounds are at risk for respiratory disorders and asthma. The highly reactive nature of the isocyanate compounds and the

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 studies, ranging from gastrointestinal problems and neurotoxicity to genotoxicity and teratogenicity. Therefore, many countries set limits for patulin content in apple products. For a precise detection of patulin, Sigma-Aldrich off

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 can produce elevated detection limits, contamination of LC and GC systems, and ultimately decrease instrument and column lifetime.

Current extraction and cleanup techniques for fatty samples may be time consuming, ex

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 and sensitivity for many food and beverage applications.

In this second issue of “News On Food”, we will focus on our continuously extending range of standards for food chemistry and biology; the determination of physical charac

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 safety. Sigma-Aldrich®, through its Supelco^® and Fluka^® brands, is very active in product development for food and beverage analysis.

This edition focuses on Food Safety and Food Chemistry; including applications

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 ideal adsorbent tube, such as Carbotrap tubes, will trap and retain compounds of interest for the entire sampling period, then allow total analyte desorption without thermal decomposition. The rate of release should be as rapid as possible, to

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 your application.

In this edition, you can get tools to help you select applications for air sampling; find air and emmissions proficiency testing materials; and learn more about ASSET™ EZ4-NCO Standards and the ATIS (Adsorbent T