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Multi-faceted Characterization of Wet-milled Griseofulvin Nanosuspensions for Elucidation of Aggregation State and Stabilization Mechanisms

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Abstract

Characterization of wet-milled drug suspensions containing neutral polymer–anionic surfactant as stabilizers poses unique challenges in terms of assessing the aggregation state and examining the stabilization mechanisms. Using a multi-faceted characterization method, this study aims to assess the aggregation state of wet-milled griseofulvin (GF) nanosuspensions and elucidate the stabilization mechanisms and impact of stabilizers. Two grades, SSL and L, of hydroxypropyl cellulose (HPC) with molecular weights of 40 and 140 kg/mol, respectively, were used as a neutral stabilizer at concentrations varying from 0 to 7.5% (w/w) without and with 0.05% (w/w) sodium dodecyl sulfate (SDS). The aggregation state was examined via laser diffraction, scanning electron microscope (SEM) imaging, and rheometry. Zeta potential, stabilizer adsorption, surface tension, and drug wettability were used to elucidate the stabilization mechanisms. The results suggest that deviation from a uni-modal PSD and pronounced pseudoplasticity with power–law index lower than one signify severe aggregation. Polymer or surfactant alone was not able to prevent GF nanoparticle aggregation, whereas HPC–SDS combination led to synergistic stabilization. The effect of polymer concentration was explained mainly by the stabilizer adsorption and partly by surface tension. The synergistic stabilization afforded by HPC–SDS, traditionally explained by electrosteric mechanism, was attributed to steric stabilization provided by HPC and enhanced GF wettability/reduced surface tension provided by SDS. Zeta potential results could not explain the mitigation of aggregation by HPC–SDS. Overall, this study has demonstrated that the elucidation of the complex effects of HPC–SDS on GF nanosuspension stability entails a multi-faceted and comprehensive characterization approach.

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Funding

The authors acknowledge financial support from the U.S. National Science Foundation (NSF) Engineering Research Center (ERC) for Structured Organic Systems (SOPS) through Grant EEC-0540855.

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Authors and Affiliations

  1. Otto H. York Department of Chemical, Biological and Pharmaceutical Engineering, New Jersey Institute of Technology, 161 Warren St. 150 Tiernan Hall, Newark, New Jersey, 07102, USA

    M. Li, P. Alvarez, P. Orbe & E. Bilgili

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Correspondence to E. Bilgili.

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Li, M., Alvarez, P., Orbe, P. et al. Multi-faceted Characterization of Wet-milled Griseofulvin Nanosuspensions for Elucidation of Aggregation State and Stabilization Mechanisms. AAPS PharmSciTech 19, 1789–1801 (2018). https://doi.org/10.1208/s12249-018-0993-4

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