| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1429542 | Materials Science and Engineering: C | 2013 | 5 Pages |
•The interaction between phosphate groups of ss-DNA and Al–OH groups•Higher energy barrier for the adsorption of ss-DNA•The individual ss-DNA with mono-layer coverage of the allophane clustered particle
To understand the propensity of natural allophane to adsorb the DNA molecules, the adsorption characteristics were assessed against natural allophane (AK70), using single-stranded DNA (ss-DNA) and adenosine 5′-monophosphate (5′-AMP) as a reference molecule. The adsorption capacity of ss-DNA on AK70 exhibited one order of magnitude lower value as compared with that of 5′-AMP. The adsorption capacity of ss-DNA decreased with increasing pH due to the interaction generated between phosphate groups of ss-DNA and functional Al–OH groups on the wall perforations through deprotonating, associated with higher energy barrier for the adsorption of ss-DNA. The adsorption morphologies consisting of the individual ss-DNA with mono-layer coverage of the clustered allophane particle were observed successfully through transmission electron microscopy analysis.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slide
