Analysis of Antibiotic Dapsone and Related Impurities in Mixed-Mode Chromatography

Separation type: Liquid Chromatography Mixed-mode

Dapsone is an antibiotic used to treat leprosy and acne. Obelisc R was used to analyze dapsone and its impurities. Obelisc R is a tri-modal reversed-phase, cation- and anion-exchange column. Method is compatible with LC/MS and prep chromatography.


Column Obelisc R, 4.6×150 mm, 5 µm, 100A
Mobile Phase Gradient MeCN – 0-25%, 6 min, 25-70% 14 min
Buffer Gradient Formic Acid – 0.05%-0.3%, 10 min, 14 min hold
Flow Rate 1.0 ml/min
Detection UV, 270 nm



Class of Compounds
 Insecticide, Herbicide, Fungicide,  Hydrophobic, Ionizable
Analyzing Compounds Dapsone


Application Column

Obelisc R

SIELC has developed the Obelisc™ columns, which are mixed-mode and utilize Liquid Separation Cell technology (LiSC™). These cost-effective columns are the first of their kind to be commercially available and can replace multiple HPLC columns, including reversed-phase (RP), AQ-type reversed-phase, polar-embedded group RP columns, normal-phase, cation-exchange, anion-exchange, ion-exclusion, and HILIC (Hydrophilic Interaction Liquid Chromatography) columns. By controlling just three orthogonal method parameters - buffer concentration, buffer pH, and organic modifier concentration - users can adjust the column properties with pinpoint precision to separate complex mixtures.

Select options
Application Analytes:

Application Detection:
ELSD Detection
UV Detection
SIELC Technologies usually develops more than one method for each compound. Therefore, this particular method may not be the best available method from our portfolio for your specific application. Before you decide to implement this method in your research, please send us an email to so we can ensure you get optimal results for your compound/s of interest.