Chemical Composition Analysis of Polyolefins by Multiple Detection GPC-IR5
June 1st 2011Polyolefin (PO) is the largest volume industrial polymer in the world for making a wide range of commercial products that touch nearly every aspect of our daily lives, such as automobile parts, pipes, packaging films, household bottles, baby diapers, and so on.
Separation of Quaternary Ammonium Compounds Using a Bonded Polymeric Zwitterionic Stationary Phase
June 1st 2011Using a bonded polymeric zwitterionic stationary phase, in HILIC mode, polar quaternary herbicides like Diquat can easily be retained, with good peak symmetry. The impact of ionic strength and organic content in the mobile phase is discussed.
Resistive Glass Inlet Tubes Increase Ion Throughput
June 1st 2011Resistive glass tubes and plates are designed to guide ions by generating a uniform electric field. PHOTONIS resistive glass products are composed of a proprietary lead silicate glass that has been specially processed to create a resistive layer at the surface. The resistivity can be varied over several orders of magnitude to suit the specific application.
Method 525.2 Update: Analyte Recoveries with New CCL3 Compounds
June 1st 2011EPA is updating method 525.2. The CCL3 includes 104 analytes. UCT has evaluated the recoveries of these compounds, including the current list, using proposed changes to the method with the C18-based UCT ENVIRO-CLEAN? 83 mL Extraction Cartridge ECUNI525.
Isolation of Benzylideneacetophenone from a Crude Reaction Mixture
June 1st 2011Benzylideneacetophenone forms the central core for a variety of important biological compounds, known collectively as chalcones. Many of these compounds have significant medicinal value as they demonstrate antibacterial, antifungal, antitumor, and anti-inflammatory properties.
Novel C18 Stationary Phase Provides Exceptional Results for Metabolite Profiling
Metabolomics, the study of small molecule metabolites that are found within a biological sample, is an emerging field of study. Progress in this field depends upon technological advancement in the fields of LC–MS and separation technology.
Extraction of Sub-Nanogram Levels of Catecholamines from Human Plasma Using EVOLUTE? WCX
June 1st 2011A new, efficient, effective, and sensitive sample preparation application for the extraction of the catecholamines epinephrine, norepinephrine, and dopamine from human plasma at significantly low levels using EVOLUTE WCX, a resin-based mixed-mode sorbent with an optimized combination of nonpolar (hydrophobic) and weak cation exchange interactions.
Rapid and Streamlined Screening of Barbiturates
June 1st 2011Barbiturates are a class of antidepressants whose abuse and addiction by recreational users has become a widespread problem (www.nlm.nih.gov). In our work we strived to streamline the barbiturate screening process to provide a fast, cost-effective, and reproducible method from start to finish for forensic labs who are involved in high-throughput processing.
Fast Determination of Catechins in Tea
June 1st 2011Tea, one of the most consumed non-alcoholic drinks worldwide, contains catechins that are powerful antioxidants thought to provide many health benefits, including reduction of cholesterol and obesity, and protection against cardiovascular disease and cancer.
Automated One Step Solid Phase Extraction and Concentration of PCBs in Water
June 1st 2011PCBs are a group of synthetic organic chemicals that contain 209 individual compounds (known as congeners) with varying harmful effects. PCBs enter the environment as mixtures containing a variety of individual components.