Journal
COLLOIDS AND SURFACES B-BIOINTERFACES
Volume 135, Issue -, Pages 339-345Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfb.2015.07.069
Keywords
Zn-Al-layered double hydroxides; Acetylsalicylic acid; Release; Molecular simulation
Funding
- Fundamental research Funds for the Central Universities [2652015288, 2652013049]
- National High Technology Research and Development Program (863 Program) of China [2012AA06A109]
- National Key Laboratory of Minerals, China [09B003]
- City University of Hong Kong Strategic Research Grant (SRG) [7004188]
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Aspirin or acetylsalicylic acid (AA), a non-steroidal anti-inflammatory drug, is intercalated into Zn-Al-layered double hydroxides (ZnAl-LDHs) by co-precipitation and reconstruction methods. The composition, structure, and morphology of the intercalated products as well as their release behavior are determined experimentally and theoretically by Material Studio 5.5. Experimental results disclose the strong interaction between the LDHs sheets and AA in the intercalated ZnAl-LDHs produced by co-precipitation and slow release of AA from the intercalated ZnAl-LDHs in both phosphate buffered saline (PBS) and borate buffered saline (BBS) solutions. The percentage of AA released from the ZnAl-LDHs prepared by both methods in PBS (96.87% and 98.12%) are much more than those in BBS (68.59% and 81.22%) implying that both H4BO4- and H2PO4- can exchange with AA in the ZnAl-LDHs. After M is released to PBS, ZnAl-LDHs break into small pieces. The experimental results are explained theoretically based on the calculation of the bonding energy between the anions and LDHs sheets as well as the Al-O bond length change in the LDHs sheets. (C) 2015 Elsevier B.V. All rights reserved.
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