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Complexation study of the anticancer agent EO-9 with 2-hydroxypropyl-beta-cyclodextrin.

J H Beijnen¹, S C van der Schoot, B Nuijen

¹Department of Pharmacy & Pharmacology, Slotervaart Hospital/The Netherlands Cancer Institute, Amsterdam, The Netherlands.

Drug Development and Industrial Pharmacy

|July 30, 2008

Summary

This summary is machine-generated.

2-hydroxypropyl-beta-cyclodextrin (HPbetaCD) effectively solubilizes the indoloquinone agent EO-9 for bladder instillation. HPbetaCD enhances EO-9 stability and is an excellent pharmaceutical complexing agent for this application.

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Area of Science:

Pharmaceutical Sciences
Drug Delivery
Materials Science

Background:

EO-9 is an indoloquinone agent considered for bladder instillation.
Effective formulation requires a suitable complexing agent to enhance solubility and stability.
2-hydroxypropyl-beta-cyclodextrin (HPbetaCD) was investigated for its complexation potential with EO-9.

Purpose of the Study:

To evaluate the complexation of EO-9 with HPbetaCD in aqueous solution and solid-state forms.
To assess the impact of HPbetaCD on the solubility and chemical stability of EO-9.
To determine the suitability of HPbetaCD as a pharmaceutical complexing agent for EO-9 bladder instillations.

Main Methods:

Phase solubility studies to determine complexation constants (K1:1), complexation efficiency (CE), and utility number (UCD).
UV-visible spectroscopy (UV/VIS) to analyze complexation.
Solid-state characterization using Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), X-ray diffraction (XRD), and scanning electron microscopy (SEM).

Main Results:

Phase solubility studies yielded a K1:1 of 32.9, CE of 0.0457, and UCD of 38.3, indicating weak complexation but high utility as a solubilizer.
HPbetaCD demonstrated a positive effect on the chemical stability of EO-9 in aqueous solution.
Solid-state analyses confirmed HPbetaCD's effectiveness in forming complexes with EO-9.

Conclusions:

HPbetaCD is a highly useful solubilizer for EO-9 in pharmaceutical formulations.
HPbetaCD enhances the chemical stability of EO-9.
HPbetaCD is confirmed as an excellent pharmaceutical complexing agent for EO-9 bladder instillation formulations, with simple reconstitution possible.