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Mater Sci Eng C Mater Biol Appl ; 33(8): 5079-83, 2013 Dec 01.
Artigo em Inglês | MEDLINE | ID: mdl-24094227

RESUMO

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.


Assuntos
Silicatos de Alumínio/química , DNA de Cadeia Simples/química , Nanopartículas/química , Monofosfato de Adenosina/química , Adsorção , Argila , Propriedades de Superfície
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