Abstract
Liposomes incorporating polyethylene glycol (PEG)-conjugated lipids (PEGylated liposomes) have attracted attention as drug delivery carriers because they show good in vivo stability. The lipid component of PEGylated liposomal formulations needs to be quantified for quality control. In this study, a simple reversed-phase high-performance liquid chromatography (HPLC) method with an evaporative light-scattering detector (ELSD) was established for simultaneous determination of hydrogenated soy phosphatidylcholine, cholesterol, PEG-conjugated lipid, and hydrolysis products of phospholipid in PEGylated liposomal formulations. These lipids were separated using a C18 column with a gradient mobile phase consisting of ammonium acetate buffer and ammonium acetate in methanol at a flow rate of 1.0 ml/min. This method provided sufficient repeatability, linearity, and recovery rate for all lipids. However, the linearity and recovery rates of cholesterol achieved using a ultraviolet (UV) detector were better than those achieved using an ELSD. This validated method can be applied to assess the composition change during the preparation process of liposomes and to quantify lipid components and hydrolysis products contained in a commercially available liposomal formulation DOXIL®. Taken together, this reversed-phase HPLC-UV/ELSD method may be useful for the rapid or routine analysis of liposomal lipid components in process development and quality control.
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ACKNOWLEDGMENTS
We thank Professor Maitani, Hoshi University, and Professor Mruyama and Dr. Suzuki, Teikyo University, for their advice regarding the preparation of PEGylated liposomes. This study was supported by the Research on Publicly Essential Drugs and Medical Devices from the Japan Health Sciences Foundation (KHB1005 and KHB1206).
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Fig. 1
Effects of ammonium acetate amount (percent volume) (a) and concentration (b) in the mobile phase on the retention times of Chol, HSPC, and DSPE-PEG. (PDF 19 kb)
Fig. 2
HPLC-ELSD detection of a standard mixture (a) and DOXIL® (b) in the mobile phase with methanol–200 mM ammonium acetate buffer (99:1, v/v). A standard mixture (20 μl) containing 300 μg/ml of Chol, and 750 μg/ml each of HSPC and DSPE-PEG was injected. DOXIL® was diluted 10-fold with methanol, and 20-μl aliquots of the diluted solution were injected. (PDF 34 kb)
Fig. 3
Effect of the pH of ammonium acetate in the mobile phase with methanol–200 mM ammonium acetate buffer (98:2, v/v) on the retention times of SA, S-LysoPC, Chol, HSPC, and DSPE-PEG. (PDF 15 kb)
Fig. 4
HPLC-ELSD detection of a standard mixture (a) and DOXIL® (b) in the mobile phase with methanol–200 mM ammonium acetate buffer (pH 4.0) (98:2, v/v). A standard mixture (20 μl) containing 150 μg/ml (each) of P-LysoPC, S-LysoPC, PA, and SA; 300 μg/ml of Chol; and 750 μg/ml each of HSPC and DSPE-PEG was injected. (PDF 114 kb)
Fig. 5
Standard curves of Chol, HSPC-2, HSPC-2, DSPE-PEG, S-LysoPC, and SA. Log (concentration) was plotted against log (area) for each lipid. (PDF 45 kb)
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Shibata, H., Yomota, C. & Okuda, H. Simultaneous Determination of Polyethylene Glycol-Conjugated Liposome Components by Using Reversed-Phase High-Performance Liquid Chromatography with UV and Evaporative Light Scattering Detection. AAPS PharmSciTech 14, 811–817 (2013). https://doi.org/10.1208/s12249-013-9967-8
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DOI: https://doi.org/10.1208/s12249-013-9967-8