¹⁸F-labeled modified porous silicon particles for investigation of drug delivery carrier distribution in vivo with positron emission tomography.

Abstract:

:Because of its biocompatibility and ability to accommodate a variety of payloads from poorly soluble drugs to biomolecules, porous silicon (PSi) is a lucrative material for the development of carriers for particle-mediated drug delivery. We report a successful direct one-step (18)F-radiolabeling of three types of PSi microparticles, thermally hydrocarbonized THCPSi, thermally oxidized TOPSi, and thermally carbonized TCPSi for the investigation of their biodistribution in vivo with positron emission tomography as part of their evaluation as carriers for particle-mediated drug delivery. FTIR and XPS characterization of the PSi materials after carrier-added (18)F/(19)F-radiolabeling reveals that depending on the material the (18)F-labeling is likely to be accomplished either by substitution for surface silyl hydrogen or silyl fluoride or by nucleophilic attack of (18)F(-) to Si-O-Si bridges. With the selected (18)F-radiolabeling method, good to excellent in vitro radiolabel stability in simulated gastric and intestinal fluids and in plasma is achieved for all the particle types studied. Finally, a preliminary evaluation of (18)F-THCPSi microparticle biodistribution in the rat gastrointestinal tract after oral administration is reported, illustrating the utility of using (18)F-radiolabeled PSi as imaging probes for PSi-based drug delivery carrier distribution in vivo.

journal_name

Mol Pharm

journal_title

Molecular pharmaceutics

authors

Sarparanta M,Mäkilä E,Heikkilä T,Salonen J,Kukk E,Lehto VP,Santos HA,Hirvonen J,Airaksinen AJ

doi

10.1021/mp2001654

subject

Has Abstract

pub_date

2011-10-03 00:00:00

pages

1799-806

issue

5

eissn

1543-8384

issn

1543-8392

journal_volume

8

pub_type

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