Effect of pH on the Surface Layer of Molecular Crystals at the Solid-Liquid Interface

Mikkel Herzberg, Anders S. Larsen, Tue Hassenkam, Anders Madsen, Jukka Rantanen*

*Corresponding author af dette arbejde

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

2 Citationer (Scopus)

Abstract

Dissolution of solid matter into aqueous solution is one of the most challenging physicochemical aspects related to drug development. While influenced by several parameters, the effect of pH remains the most important one to be fully understood. The dissolution process is essentially controlled by activity at the surface of the molecular crystals, which is difficult to characterize experimentally. To address this, a combination of in situ atomic force microscopy (AFM) with molecular dynamics (MD) simulation is reported. AFM allows for direct visualization of the crystal surface of basic and acidic model compounds (carvedilol and ibuprofen) in contact with an aqueous medium with varying pH. A dramatic increase in surface mobility in the solid-liquid interface could be observed experimentally as a function of pH. The in situ AFM approach opens up for a more detailed understanding of the behavior of particulate matter in solution with importance at different levels, ranging from engineering aspects related to crystallization, and biological considerations related to bioavailability of the final drug product.

OriginalsprogEngelsk
TidsskriftMolecular Pharmaceutics
Vol/bind19
Udgave nummer5
Sider (fra-til)1598–1603
ISSN1543-8384
DOI
StatusUdgivet - 2022

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© 2022 American Chemical Society.

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