HILIC

Separation of polar compounds by conventional reverse phase chromatography can be challenging due to their poor retention. Other HPLC approaches include normal phase chromatography (NPC) and its variation, hydrophilic interaction chromatography (HILIC).

An Empirical Evaluation of HILIC and Monolithic Columns for Supercritical Fluid Chromatography (SFC) Applications - Thar Apps Note

Since melamine and its metabolites are extremely polar compounds, they serve as very good candidates for HILIC chromatography. Simultaneous and fast determination and confirmation of melamine and cyanuric acid along with two other compounds using a novel amino bonded phase in HILIC mode coupled with a complete solutions approach is presented.

A structured, general purpose approach to method development for bioanalytical hydrophilic interaction chromatography–tandem mass spectrometry (HILIC–MS-MS) applications is described.

Researchers from Amgen (Thousand Oaks, California) examined the separation mechanism in the analysis of polar and basic hydrazines using hydrophilic interaction liquid chromatography (HILIC) with alcohol rather than acetonitrile as a weak eluent.

John Dolan?s recommendation for Session 1120, ?HILIC- Fundamentals and New Applications,? was presided over by Olujide T. Akinbo of Butler University. The session focused on innovations and breakthroughs in HILIC.

Melamine is an organic base and a trimer of cyanamide, with a 1,3,5- triazine skeleton.

The analysis of anions and cations is critical during drug development and related QC. Measure both the API and the counterion in a single run.

The analysis of polar compounds in support of clinical and preclinical pharmacokinetic studies requires an analytical methodology capable of achieving ultra-low detection and quantification limits. The high sensitivity afforded by coupling HPLC with tandem mass spectrometry (MS-MS) has made it the technique of choice in this environment, but it is subject to the following limitations when reversed phase liquid chromatography (RPLC) is used:

The differences between retention of polar-ionic compounds on silica hydride-based and hydrophilic interaction liquid chromatography (HILIC) stationary phases are discussed. The retention capabilities of a number of silica hydride columns are reviewed, including their ability to operate in the reversed-phase mode. A means of differentiating between the two types of materials based upon their retenion modes is suggested.

Phenomenex

The terms hydrophilic interaction liquid chromatography (HILIC) and aqueous normal phase (ANP) chromatography very often are used interchangeably.

The authors work to develop a universal high performance liquid chromatography method that is capable of simultaneously retaining and separating both cations and anions within a single chromatographic analysis for the purpose of quantification in pharmaceutical products.