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2-Hydroxypropyl-β-Cyclodextrin Aggregates: Identification and Development of Analytical Techniques.

André Rodrigues Sá Couto1, Alexey Ryzhakov2, Thorsteinn Loftsson3

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Summary

Detecting hydroxypropyl-β-cyclodextrin (HPβCD) aggregates is crucial. Permeation studies effectively detect HPβCD aggregates and determine critical aggregation concentration, offering a reliable method for pharmaceutical formulation.

Keywords:
2-hydroxypropyl-β-cyclodextrinaggregationcritical aggregation concentrationnanoparticlespermeation

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Area of Science:

  • Pharmaceutical Sciences
  • Analytical Chemistry
  • Physical Chemistry

Background:

  • Accurate detection and quantification of hydroxypropyl-β-cyclodextrin (HPβCD) aggregates are vital for pharmaceutical formulation development.
  • Understanding aggregation behavior is key to ensuring drug product stability and efficacy.

Purpose of the Study:

  • To evaluate five analytical methods for detecting HPβCD aggregates and determining their critical aggregation concentration (cac).
  • To identify the most suitable method for studying HPβCD aggregation phenomena in pharmaceutical contexts.

Main Methods:

  • Comparative analysis of osmometry, viscometry, tensiometry, dynamic light scattering (DLS), and permeability studies.
  • Assessment of each method's ability to detect aggregates and quantify cac.
  • Evaluation of invasiveness and data conclusiveness for each technique.

Main Results:

  • Tensiometry showed minimal response to HPβCD aggregation.
  • Osmolality and viscosity indicated significant solute-solvent interactions, potentially related to aggregation.
  • DLS effectively detected aggregates and estimated size but had quantification limitations.
  • Permeation studies proved superior for aggregate detection and cac determination, being least invasive and most conclusive.
  • HPβCD exhibited a lower aggregation tendency compared to native β-cyclodextrin.

Conclusions:

  • Permeation studies are the optimal method for analyzing HPβCD aggregation and determining cac in pharmaceutical formulations.
  • HPβCD demonstrates greater stability against aggregation than βCD.
  • Reliable analytical methodology is essential for pharmaceutical formulators working with HPβCD.