Drug-nanocarrier interaction--tracking the local structure of calcium silicate upon ibuprofen loading with X-ray absorption near edge structure (XANES).
The interaction between drug carrier and drug molecules is fundamental for the study of drug delivery, drug targeting, and drug release. Until now, little has been known about the interaction at the molecular level. X-Ray absorption near edge structure (XANES) spectroscopy is a sensitive tool for identifying this interaction. Herein, we report the use of calcium and silicon K-edge X-ray absorption near edge structure (XANES) spectroscopy to investigate how drug molecules interact with different functional groups in calcium silicate hydrate and anhydrous calcium silicate nanocarriers with different morphologies. Significant changes are observed in the XANES spectra after drug loading; ibuprofen (IBU) loading leads to the ordering of silicates locally and there is loss of hydrates during the IBU loading processes.
Department of Chemistry, University of Western Ontario, London, Ontario, Canada.
Xiaoxuan
X
Guo
Jin
J
Wu
Yun-Mui
YM
Yiu
Yongfeng
Y
Hu
Ying-Jie
YJ
Zhu
Tsun-Kong
TK
Sham
D017610:Calcium Compounds / Q000737:chemistry*; D004337:Drug Carriers / Q000737:chemistry*; D007052:Ibuprofen / Q000737:chemistry*; D015394:Molecular Structure; D053758:Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D017640:Silicates / Q000737:chemistry*; D013499:Surface Properties; D056928:X-Ray Absorption Spectroscopy
D017610:Calcium Compounds; D004337:Drug Carriers; D017640:Silicates; C031293:calcium silicate; D007052:Ibuprofen