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Silver nanoparticle (Ag-NPs)-immobilized and amine-functionalized carbon nanotubes (MWCNTs), MWCNTAg-NH2, were easily prepared in order to develop an efficient delivery system of biomolecules without complicated processes of manufacture. For this, Ag-NPs-immobilized MWCNTs, MWCNT-Ag, were initially prepared in order to create large surface area to enable more efficient linkage with guest-molecules using pristine MWCNTs. The Ag-NPs on MWCNTs were further positively functionalized with 2-aminoethanthiol to allow ionic linkage with biomolecules. Ultimately, the positively charged delivery system proved to be highly effective for the binding capacity of bovine serum albumin (BSA) as a negatively charged model protein, when compared to that of lysozyme used as a positively charged model protein. The releasing profile of BSA was observed in almost linear pattern for about two weeks in a saline solution. This study demonstrated the potential usefulness of the pristine MWCNTs in conjunction with Ag-NPs for the selective delivery of many (negatively or positively) charged biomolecules including proteins and genes.

Positively Charged Silver Nanoparticles Threaded on Carbon Nanotube for the Efficient Delivery of Negatively Charged Biomolecules