Abstract
Primaquine (PQ), an 8-aminoquinoline antimalarial drug, has been widely used for the eradication of hypnozoites from the liver and, therefore, recognized as the radical cure of malaria. However, the clinical applications of PQ are restricted to patients with glucose-6-phosphate dehydrogenase (G6PD) deficiency due to severe dose-related hemolytic side effects. Nanoparticle carriers have shown great potential in achieving higher PQ concentrations in the target site, thereby reducing dose-related systemic toxicity caused by non-specific exposure. This work aims to develop, compare, and evaluate three PQ-loaded lipid-based drug carriers including solid lipid nanoparticles (SLN), nanostructured lipid carriers (NLC), and nano-emulsions (NE). The optimized PQ-SLN, PQ-NLC, and PQ-NE had a particle size of 250 nm, a PDI range of 0.1 to 0.3, a zeta potential of − 30 mV, and entrapment efficiency of ~ 90%. All lipid formulations showed sustained release in both simulated gastric and intestinal fluids over 6 h. Four empirical models — including zero-order, Higuchi, Korsmeyer-Peppas, and Hixson-Crowell models — were tested to understand the drug release mechanisms of PQ-SLN, PQ-NLC, and PQ-NE. The model fitness was found to be the highest in the Korsmeyer-Peppas model for all the PQ-loaded lipid formulations (R2: 0.88–0.94). No significant changes were observed in the entrapment efficiency, particle size, and PDI of lipid formulations throughout 1 month of storage at 4 °C and 25 °C. PQ-SLN and PQ-NLC can be further lyophilized with cryoprotectants to improve long-term stability. Finally, the treatment of erythrocytes with PQ-SLN, PQ-NLC, and PQ-NE reduced erythrocyte hemolysis by approximately 4.5-fold compared to the free drug solution.
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20 December 2021
A Correction to this paper has been published: https://doi.org/10.1208/s12249-021-02171-y
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Acknowledgements
The authors acknowledge the Chemistry and Drug Metabolism and Pharmacokinetics core, Center of Biomedical Research Excellence (COBRE), (P30GM122733-01A1) funded by the National Institute of General Medical Sciences (NIGMS) a component of the National Institutes of Health (NIH). Scanning electron microscopy images presented in this study were generated using the instruments and services at the Microscopy and Image Center, the University of Mississippi. This facility is supported in part by the National Science Foundation (Grant # 1726880).
Funding
This work was supported by the National Institute of Allergy and Infectious Disease (NIAID), National Institute of Health (NIH; Grant# 1R01AI132579). The contents are the sole responsibility of the authors and do not necessarily represent the official views of the NIH.
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Wu, KW., Sweeney, C., Dudhipala, N. et al. Primaquine Loaded Solid Lipid Nanoparticles (SLN), Nanostructured Lipid Carriers (NLC), and Nanoemulsion (NE): Effect of Lipid Matrix and Surfactant on Drug Entrapment, in vitro Release, and ex vivo Hemolysis. AAPS PharmSciTech 22, 240 (2021). https://doi.org/10.1208/s12249-021-02108-5
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DOI: https://doi.org/10.1208/s12249-021-02108-5