Exploring separation mechanisms and lipophilicity in hydrophilic interaction chromatography conditions by thin‐layer chromatography of anesthetics and adjuvant drugs as polar model compounds

• Published in: Journal of separation science Vol. 47; no. 12; pp. e2400099 - n/a
• Main Authors: Radoičić, Aleksandra, Šegan, Sandra, Milojković‐Opsenica, Dušanka
• Format: Journal Article
• Language: English
• Published: Germany Wiley Subscription Services, Inc 01.06.2024
• Subjects: Acetonitrile; Adjuvants; Adsorption; Anesthetics; Chromatography; Chromatography, Liquid; Chromatography, Thin Layer; hydrophilic interaction liquid chromatography; Hydrophilicity; Hydrophobic and Hydrophilic Interactions; Lipophilicity; Liquid chromatography; Moisture content; Phase composition; retention mechanisms; Separation; Silica gel; small polar molecules; Solvent extraction processes; Solvents; Solvents - chemistry; Sorbents; thin‐layer chromatography; retention mechanisms; lipophilicity; hydrophilic interaction liquid chromatography; small polar molecules; thin‐layer chromatography
• ISSN: 1615-9306; 1615-9314; 1615-9314
• DOI: 10.1002/jssc.202400099

The chromatographic behavior of the selected compounds was studied under conditions of hydrophilic interaction liquid chromatography (HILIC). The effect of mobile phase composition on the retention in different chromatographic systems was systematically examined using high‐performance thin‐layer chromatography. The sorbents of different polarity and adsorption characteristics were selected and mixtures of water and organic solvents of various compositions, from pure water to pure organic solvent were used as mobile phases. Increasing the amount of water in the mobile phase leads to a conversion of the separation mechanism, and the retention curves have a characteristic “U” shape. The conversion between the adsorption and partition mechanisms is most likely continuous and depends on the chemical nature of separated substances, the stationary phase as well as on organic component of the mobile phase. Silica gel can be considered the most suitable stationary phase for the systematic investigation of the chromatographic behavior of the test compounds, whereas acetonitrile was the most suitable solvent. The obtained results contribute to the understanding of the dominant separation mechanism, the type, and the intensity of the interactions between separated substances with both stationary and mobile phases. Besides, the lipophilicity parameters obtained under HILIC conditions were evaluated and correlated with the calculated values.