Terrell Mathews | Authors


Increased Efficiency and Resolution with Kinetex Core-Shell Technology

The combination of the small particle size and narrow particle size distribution coupled with the significantly shorter diffusion path provided by the Kinetex core-shell particle results in a material that yields significantly increased column efficiencies and chromatographic resolution. This is a significant benefit for separation scientists looking to increase efficiency and chromatographic resolution, especially for complex separations containing many compounds and very closely eluting compounds so that accurate identification and quantification can be achieved.

Solid-Phase Extraction of Aflatoxins from Peanut Butter and Quantification Using Kinetex Core-Shell Technology by LC–MS–MS

As a result of their high toxicity and carcinogenicity, aflatoxins are of major concern for food producers, the food processing industry and consumers. Most countries have legislation setting maximum permissible limits for aflatoxins, which are in the low micrograms per kilogram for food matrices.

A Simplified Approach to Optimize SPE Method Development with Downstream LC–MS Analysis Allowing 100% Organic, Basified Injection Solvents

Automated solid-phase extraction (SPE) has been used extensively with liquid chromatography–tandem mass spectrometry (LC–MS-MS) to facilitate high-throughput analysis in the pharmaceutical, diagnostic, and forensic toxicology areas. In this work, we demonstrate the use of a systemized approach to SPE method development and LC–MS-MS analysis. This approach provides dramatic savings in analysis time and takes advantage of new innovations in high performance liquid chromatography (HPLC) columns to provide the cleanest extracts for LC–MS injection.

Using pH-LC to Control Selectivity of Acidic and Basic Compounds on Gemini-NX

The use of mobile phase pH to control analyte ionization states (pH-LCâ„¢) in reversed phase HPLC separations is a highly effective way to change selectivity. The ionized species of an analyte is shown to have higher polarity (less hydrophobicity) than the neutral species, which results in a loss of expected retention for that analyte. This can be attributed to less interaction with the hydrophobic stationary phase and greater affinity with the aqueous portion of the mobile phase. Ionized species also participate in ionic interactions with exposed and activated silanols, which impact peak shape and reproducibility.