Exploring the Molecular-Level Architecture of the Active Compounds in Liquisolid Drug Delivery Systems Based on Mesoporous Silica Particles: Old Tricks for New Challenges.

Abstract:

:A general, easy-to-implement strategy for mapping the structure of organic phases integrated in mesoporous silica drug delivery devices is presented. The approach based on a few straightforward solid-state NMR techniques has no limitations regarding concentrations of the active compounds and enables straightforward discrimination of various organic phases. This way, among a range of typical arrangements of the active compounds and solvent molecules, a unique, previously unknown organogel phase of the self-assembled tapentadol in glucofurol as a solvent was unveiled and clearly identified. Subsequently, with an aid of 2D 1H-1H MAS NMR and high-level quantum-chemical calculations this uncommon low-molecular-weight organogel phase, existing exclusively in the porous system of the silica carrier, was described in detail. The optimized model revealed the tendency of tapentadol molecules to form hydrophobic arrangements through -OH···π interactions combined with π-π stacking occurring in the core of API aggregates, thus precluding the formation of hydrogen bonds with the solvent. Overall, the proposed experimental approach allows for clear discrimination of a variety of local structures of active compounds loaded in mesoporous silica drug delivery devices in reasonably short time being applicable for advancement of novel drug delivery systems in pharmaceutical industry.

journal_name

Mol Pharm

journal_title

Molecular pharmaceutics

authors

Brus J,Albrecht W,Lehmann F,Geier J,Czernek J,Urbanova M,Kobera L,Jegorov A

doi

10.1021/acs.molpharmaceut.7b00167

subject

Has Abstract

pub_date

2017-06-05 00:00:00

pages

2070-2078

issue

6

eissn

1543-8384

issn

1543-8392

journal_volume

14

pub_type

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