Ultrasound, pH, and Magnetically Responsive Crown-Ether-Coated Core/Shell Nanoparticles as Drug Encapsulation and Release Systems
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AbstractCore@shell nanoparticles with superparamagnetic iron oxide core, mesoporous silica shell, and crown ether periphery were fabricated toward drug delivery and tumor cell imaging. By the concept of nanovalve based on supramolecular gatekeeper, stimuli-responsive drug delivery nanosysterns Fe3O4@SiO2@meso-SiO2@crown ethers were synthesized by (i) modified solvothermal reaction; (ii) sol-gel reaction; and (iii) amide coupling reaction. The successful coupling of the dibenzo-crown ethers onto the mesoporous silica shell was confirmed by thermogravimetric analysis and Infrared spectroscopy. In this system, the "ON/OFF" switching of the gatekeeper supramolecules can be controlled by pH-sensitive intramolecular hydrogen bonding or electrostatic interaction (such as metal chelating). Biological evaluation of the nanoparticles renders them noncytotoxic and can be uptaken by L929 cells. In this work, the antitumor drug (doxorubicin) loading and release profiles which were studied by the UV/visible absorption spectroscopy. The mechanism involves the best-fit binding of crown ethers with cesium or sodium ions at different pH values with ultrasonic wave in phosphate buffered saline (PBS). Magnetic resonance imaging analysis of the particles reveals a high relaxivity, rendering them potentially useful theranostic agents.
All Author(s) ListLee SF, Zhu XM, Wang YXJ, Xuan SH, You QH, Chan WH, Wong CH, Wang F, Yu JC, Cheng CHK, Leung KCF
Journal nameACS Applied Materials and Interfaces
Detailed descriptionTo ORKTS: doi: 10.1021/am4004705
Year2013
Month3
Day13
Volume Number5
Issue Number5
PublisherAmerican Chemical Society
Pages1566 - 1574
ISSN1944-8244
eISSN1944-8252
LanguagesEnglish-United Kingdom
Keywordscrown ether; drug carrier; magnetic resonance imaging; nanoparticle; ultrasound
Web of Science Subject CategoriesMaterials Science; Materials Science, Multidisciplinary; MATERIALS SCIENCE, MULTIDISCIPLINARY; Nanoscience & Nanotechnology; NANOSCIENCE & NANOTECHNOLOGY; Science & Technology - Other Topics

Last updated on 2020-27-11 at 01:17