Molecular level characterisation of the surface of carbohydrate-functionalised mesoporous silica nanoparticles (MSN) as a potential targeted drug delivery system via high resolution magic angle spinning (HR-MAS) NMR Spectroscopy

Karolina Krajewska, Anna Golkowska, Maciej Nowak, Marta Kozakiewicz-Latała, Wojciech Pudło, Andrzej Żak, Bożena Karolewicz, Yaroslav Khimyak, Karol Nartowski

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Abstract

Atomistic level characterisation of external surface species of mesoporous silica nanomaterials (MSN) poses a significant analytical challenge due to the inherently low content of grafted ligands. This study proposes the use of HR-MAS NMR spectroscopy for a molecular level characterisation of the external surface of carbohydrate-functionalised nanoparticles. MSN differing in size (32 nm, 106 nm, 220 nm) were synthesised using the sol-gel method. The synthesised materials displayed narrow particle size distribution (based on DLS and TEM results) and a hexagonal arrangement of the pores with a diameter of ca. 3 nm as investigated with PXRD and N2 physisorption. The surface of the obtained nanoparticles was functionalised with galactose and lactose using reductive amination as confirmed by FTIR and NMR techniques. The functionalisation of the particles surface did not alter the pore architecture, structure or morphology of the materials as confirmed with TEM imaging. HR-MAS NMR spectroscopy was used for the first time to investigate the structure of the functionalised MSNs suspended in D2O. Furthermore, lactose was successfully attached to the silica without breaking the glycosidic bond. The results demonstrate that HR-MAS NMR can provide detailed structural information on the organic functionalities attached at the external surface of MSN within short experimental times.
Original languageEnglish
Article number5906
JournalInternational Journal of Molecular Sciences
Volume23
Issue number11
Early online date25 May 2022
DOIs
Publication statusPublished - 1 Jun 2022

Keywords

  • mesoporous silica nanoparticles
  • MSN
  • porous materials
  • functionalisation;
  • NMR
  • HR-MAS NMR
  • surface
  • functionalisation

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