alexa Is hydrophilic interaction chromatography with silica columns a viable alternative to reversed-phase liquid chromatography for the analysis of ionisable compounds?
Chemical Engineering

Chemical Engineering

Journal of Chromatography & Separation Techniques

Author(s): McCalley DV, McCalley DV

Abstract Share this page

Abstract The separation of acidic, neutral and particularly basic solutes was investigated using a bare silica column, mostly under hydrophilic interaction chromatography (HILIC) conditions with water concentrations >2.5\% and with >70\% acetonitrile (ACN). Profound changes in selectivity could be obtained by judicious selection of the buffer and its pH. Acidic solutes had low retention or showed exclusion in ammonium formate buffers, but were strongly retained when using trifluoroacetic acid (TFA) buffers, possibly due to suppression of repulsion of the solute anions from ionised silanol groups at the low (s)(s)pH of TFA solutions of aqueous ACN. At high buffer pH, the ionisation of weak bases was suppressed, reducing ionic (and possibly hydrophilic retention) leading to further opportunities for manipulation of selectivity. Peak shapes of basic solutes were excellent in ammonium formate buffers, and overloading effects, which are a major problem for charged bases in RPLC, were relatively insignificant in analytical separations using this buffer. HILIC separations were ideal for fast analysis of ionised bases, due to the low viscosity of mobile phases with high ACN content, and the favourable Van Deemter curves which resulted from higher solute diffusivities. This article was published in J Chromatogr A and referenced in Journal of Chromatography & Separation Techniques

Relevant Expert PPTs

Relevant Speaker PPTs

Peer Reviewed Journals
 
Make the best use of Scientific Research and information from our 700 + peer reviewed, Open Access Journals
International Conferences 2017-18
 
Meet Inspiring Speakers and Experts at our 3000+ Global Annual Meetings

Contact Us

Agri & Aquaculture Journals

Dr. Krish

[email protected]

1-702-714-7001Extn: 9040

Biochemistry Journals

Datta A

[email protected]

1-702-714-7001Extn: 9037

Business & Management Journals

Ronald

[email protected]

1-702-714-7001Extn: 9042

Chemistry Journals

Gabriel Shaw

[email protected]

1-702-714-7001Extn: 9040

Clinical Journals

Datta A

[email protected]

1-702-714-7001Extn: 9037

Engineering Journals

James Franklin

[email protected]

1-702-714-7001Extn: 9042

Food & Nutrition Journals

Katie Wilson

[email protected]

1-702-714-7001Extn: 9042

General Science

Andrea Jason

[email protected]

1-702-714-7001Extn: 9043

Genetics & Molecular Biology Journals

Anna Melissa

[email protected]

1-702-714-7001Extn: 9006

Immunology & Microbiology Journals

David Gorantl

[email protected]

1-702-714-7001Extn: 9014

Materials Science Journals

Rachle Green

[email protected]

1-702-714-7001Extn: 9039

Nursing & Health Care Journals

Stephanie Skinner

[email protected]

1-702-714-7001Extn: 9039

Medical Journals

Nimmi Anna

[email protected]

1-702-714-7001Extn: 9038

Neuroscience & Psychology Journals

Nathan T

[email protected]

1-702-714-7001Extn: 9041

Pharmaceutical Sciences Journals

Ann Jose

[email protected]

1-702-714-7001Extn: 9007

Social & Political Science Journals

Steve Harry

[email protected]

1-702-714-7001Extn: 9042

 
© 2008- 2017 OMICS International - Open Access Publisher. Best viewed in Mozilla Firefox | Google Chrome | Above IE 7.0 version
adwords