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This research aims to educate students on identifying unknown polar compounds through chromatography and spectroscopy techniques.

March 28, 2026

Reversed-Phase Separation and the Identification of Unknown Polar Compounds

Key Points

This research aims to educate students on identifying unknown polar compounds through chromatography and spectroscopy techniques.
Students perform chromatographic separation using reversed-phase SPE C18 columns.
The separation targets unknown polar compounds contaminated with benzophenone.
Students determine compound identity using methods such as melting point analysis, GC-MS, IR spectroscopy, and NMR spectroscopy.
Students successfully identify unknown polar compounds with high accuracy.
Purity assessments indicate varying degrees of contamination in final samples.

Abstract

Reversed-Phase Chromatography is a standard technique for the separation of many natural compounds and is an extremely useful tool for a variety of industrial, food, law enforcement and medical applications. This manuscript describes an experiment for the separation of unknown polar compounds using inexpensive reversed-phase SPE C18 columns. Students perform a chromatographic separation on a sample of an unknown polar compound contaminated with benzophenone. Students then determine the identity of their compound with melting point, GC-MS, IR, 1H and 13C NMR spectroscopy, and comment on the purity of the final sample. The use of unknowns increases students’ individual responsibility and prevents using a partner’s data analysis. This experiment was developed for use in a first year foundation laboratory but it would also be suitable for implementation in a sophomore organic chemistry laboratory.

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Reversed-Phase Separation and the Identification of Unknown Polar Compounds

Key Points

Abstract

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