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Formulation and Characterization of Bioactive Agent Containing Nanodisks
Published on: March 17, 2023
Development of a chemically stable 10-hydroxycamptothecin nanosuspensions
Xiaohui Pu1, Jin Sun, Yan Wang
1Department of Biopharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, No. 103, Wenhua Road, Shenyang 110016, China.
International Journal of Pharmaceutics
|June 10, 2009
Summary
This study optimized nanosuspensions for 10-hydroxycamptothecin (10-HCPT), enhancing its dissolution rate. The prepared 10-HCPT nanosuspensions showed improved characteristics for potential therapeutic applications.
Area of Science:
- Pharmaceutical Nanotechnology
- Drug Delivery Systems
- Materials Science
Background:
- 10-hydroxycamptothecin (10-HCPT) is an active lactone form with therapeutic potential.
- Improving the solubility and dissolution rate of poorly soluble drugs like 10-HCPT is crucial for effective drug delivery.
- Nanosuspension technology offers a promising approach to enhance the bioavailability of hydrophobic drugs.
Purpose of the Study:
- To prepare and characterize nanosuspensions loaded with the active lactone form of 10-hydroxycamptothecin (10-HCPT).
- To optimize the preparation parameters for achieving desired nanosuspension characteristics.
- To evaluate the solid-state properties, chemical stability, and in vitro dissolution of the 10-HCPT nanosuspensions.
Main Methods:
- Nanosuspensions were prepared using a microprecipitation-high-pressure homogenization method.
- Key preparation parameters including stabilizer solution agitation rate, homogenization pressure, and cycle numbers were optimized.
- Particle size, zeta potential, morphology (transmission electron microscopy), solid state (XRD, DSC), chemical stability, and in vitro dissolution were analyzed.
Main Results:
- Optimal preparation yielded 10-HCPT nanosuspensions with a particle size of 131 nm and a zeta potential of -25.5 mV.
- Transmission electron microscopy revealed baculine or trabecular nanoparticle morphology.
- X-ray powder diffraction and differential scanning calorimetry confirmed the amorphous state of 10-HCPT in lyophilized nanosuspension powders.
- Chemical stability tests showed approximately 90% of the lactone form remained, though susceptible to conversion at pH 7.0-8.0.
- In vitro dissolution tests demonstrated a significant increase in dissolution rate for nanosuspensions compared to coarse suspensions.
Conclusions:
- Optimized preparation methods successfully produced 10-HCPT nanosuspensions with controlled particle characteristics.
- The amorphous state of 10-HCPT within the nanosuspensions may contribute to enhanced dissolution.
- The prepared nanosuspensions exhibit significantly improved dissolution rates, suggesting potential for enhanced therapeutic efficacy.
