Mechanism of Enhanced Nifedipine Dissolution by Polymer-Blended Solid Dispersion through Molecular-Level Characterization.

Abstract:

:We investigated the effect of polymer composition on nifedipine (NIF) dissolution through molecular-level characterization of NIF/hypromellose (HPMC)/Eudragit S (EUD-S) ternary solid dispersions. The dissolution rates and molecular states of NIF and polymers were evaluated in NIF/HPMC/EUD-S spray-dried samples (SPDs) with different polymer compositions. Blending of HPMC and EUD-S improved the dissolution property of each polymer. Moreover, polymer blending enhanced NIF dissolution from the NIF/polymer SPD with EUD-S/polymer wt % of 50-75%. NIF dissolved simultaneously with polymers from the NIF/polymer SPDs with high EUD-S/polymer wt %. In contrast, NIF and polymers separately dissolved from the NIF/polymer SPDs with EUD-S/polymer wt % of 10-25%, exhibiting a significantly reduced NIF dissolution rate. Fourier transform-infrared and solid-state NMR measurements revealed that HPMC and EUD-S formed molecular interactions with NIF via different interaction modes. Comprehensive analysis by spectroscopic measurements and modulated differential scanning calorimetry showed that the molecular interaction between NIF and EUD-S was stronger than that between NIF and HPMC. Furthermore, the 13C-spin-lattice relaxation time measurements revealed that EUD-S effectively restricted the molecular mobility of NIF compared with HPMC. The molecular interaction between NIF and EUD-S led to the simultaneous and fast dissolution of NIF with EUD-S from the NIF/polymer SPD with high EUD-S loading. Thus, enhanced NIF dissolution was ascribed to the fast dissolution properties of the blended polymer and to polymer-controlled NIF dissolution through the strong molecular interaction between NIF and EUD-S. To achieve efficient optimization of the formulation of polymer-blended solid dispersion with desired drug dissolution, it is necessary to consider both polymer-polymer and drug-polymer intermolecular interactions.

journal_name

Mol Pharm

journal_title

Molecular pharmaceutics

authors

Ueda K,Yamazoe C,Yasuda Y,Higashi K,Kawakami K,Moribe K

doi

10.1021/acs.molpharmaceut.8b00523

subject

Has Abstract

pub_date

2018-09-04 00:00:00

pages

4099-4109

issue

9

eissn

1543-8384

issn

1543-8392

journal_volume

15

pub_type

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