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Ion Quantitation in Liposomal Products Using RP-HPLC with Charged Aerosol Detection.
Ion concentration in liposomal drugs is important for drug stability and drug release profile. However, quantifying ion concentration in liposomal drugs is challenging due to the absence of chromophores or fluorophores of ions and the efficiency of their release from the liposome structure. To address these issues, a method based on reversed-phase high-performance liquid chromatography (RP-HPLC) coupled with a charged aerosol detector (CAD) has been developed to determine total, internal, and external ions in drug-loaded liposomal products. In this protocol, we focused on the quantitation of ammonium and sulfate ions in liposomal products, using generic PEGylated liposomal doxorubicin as an example. This method can be extended to calcium, acetate, and other ions in different liposomal formulations with slight modifications.
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