期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 -, 期 -, 页码 -出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.2c02272
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资金
- National Natural Science Foundation of China [51974367, 52042403]
- CUG Scholar Scientific Research Funds at China University of Geosciences (Wuhan) [2019152]
- National Science Fund for Distinguished Young Scholars [51225403]
This study comprehensively investigates the binding and release mechanisms of DOX by nanoclays through experimental and theoretical approaches. The high loading capacity and encapsulation efficiency of DOX by nanoclays are attributed to the exposed hydroxyl and Lewis base sites on the surfaces. pH-responsive release profiles of DOX from nanoclays are influenced by the protonation of negatively charged nanoclays in weakly acidic solutions.
Nanoclays have been developed as drug delivery systems, but their mechanisms of DOX delivery are unclear. Herein, unmodified nanoclays (halloysite, kaolinite, montmorillonite) were comprehensively studied on their in vitro binding and release mechanisms of DOX from both experimental and theoretical aspects. These nanoclays with high loading capacity (> 50%) and encapsulation efficiency capacity (> 90%) of DOX are attributed to the exposed hydroxyl groups and the Lewis base sites on the surfaces. Density functional theory calculations also confirmed that DOX is preferentially adsorbed on the Al-OH surfaces while adsorption on Si-O surfaces is limited. Besides this, the pH-responsive profiles of DOX release from nanoclays are related to the protonation of negatively charged nanoclays in weakly acidic solutions that makes it easier to dissociate with positively charged DOX. The in-depth mechanistic method in this work is widely applicable and demonstrates that nanoclays can be used as efficient nanocarriers for more biomedical applications.
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