Retention of Amikacin on Obelisc R Column

Amikacin is an aminoglycoside antibiotic used to treat different types of bacterial infections. Most of aminoglycoside antibiotic are very polar compounds containing several amino groups and sugar fragments. Such compounds are not retained on reverse phase column without ion-pairing reagents. In this application Amikacin is retained on Obelisc R column without ion-pairing reagent. Retention is contributed to mixed-mode mechanism and can be adjusted by buffer pH and buffer concentration. Amount of organic modifier (acetonitrile, tetrahydrophuran, etc.) can be used for fine tuning and improvement of peak shape. Other amino sugars can be analyzed using mixed-mode stationary phases with ELSD, LC/MS and prep chromatography compatible mobile phases.

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.

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Application Analytes:

Application Detection:
ELSD 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.