ACS Appl Mater Interfaces. 2014 Nov 26;6(22):19544-51. doi: 10.1021/am505649q. Epub 2014 Nov 14.
Supramolecular hybrid hydrogel based on host-guest interaction and its application in drug delivery
Jing Yu 1, Wei Ha, Jian-nan Sun, Yan-ping Shi
Abstract
In this work, we developed a simple, novel method for constructing gold nanocomposite supramolecular hybrid hydrogels for drug delivery, in which gold nanocrystals were utilized as building blocks. First, methoxypoly(ethylene glycol) thiol (mPEG-SH, molecular weight (MW)=5 K) capped gold nanocrystals (nanospheres and nanorods) were prepared via a facile one-step ligand-exchange procedure. Then, the homogeneous supramolecular hybrid hydrogels were formed, after adding α-cyclodextrin (α-CD) into PEG-modified gold nanocrystal solutions, due to the host-guest inclusion. Both gold nanoparticles and inclusion complexes formed between α-CD and PEG chain provided the supra-cross-links, which are beneficial to the gelation formation. The resulting hybrid hydrogels were fully characterized by a combination of techniques including X-ray diffraction, rheology studies, and scanning electron microscopy. Meanwhile, the hybrid hydrogel systems demonstrated unique reversible gel-sol transition properties at a certain temperature caused by the temperature-responsive reversible supramolecular assembly. The drug delivery applications of such hybrid hydrogels were further investigated in which doxorubicin was selected as a model drug for in vitro release, cytotoxicity, and intracellular release studies. We believe that the development of such hybrid hydrogels will provide new and therapeutically useful means for medical applications.
Keywords: drug delivery; gold nanoparticles; host−guest inclusion; supramolecular hybrid hydrogel.
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Abbreviation: mPEG-SH
Name: Methoxypoly(ethylene glycol) thiol
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