Yiu H. H. P., Bouffier L., Boldrin P., Long J., Claridge J. B., Rosseinsky M. J.,
Langmuir 2013, 29, 11354-11365.

Iron (II,III) oxide Fe3O4 nanoparticles (25 and 50 nm NPs) are grafted with amine groups through silanization in order to generate a positively charged coating for binding negatively charged species including DNA molecules. The spatial nature of the coating changes from a 2-D-functionalized surface (monoamines) through a layer of amine oligomers (diethylenetriamine or DETA, about 1 nm in length) to a 3-D layer of polyamine (polyethyleneimine or PEI, thickness ≥ 3.5 nm). These Fe3O4–PEI NPs were prepared by binding short-chain PEI polymers to the iodopropyl groups grafted on the NP surface. In this work, the surface charge density, or zeta potential, of the nanoparticles is found not to be the only factor influencing the DNA binding capacity, which also seems not to be affected by their buffering capacity profile in the range of pH 4–10. This study also allows the investigation of this 3-D effect on the surface of a nanoparticle as opposed to conventional 2-D amine functionalization. The flexibility of the PEI coating, which consists of only 1, 2, and 3° amines, on the nanoparticle surface has a significant influence on the overall DNA binding capacity and the binding efficiency (or N/P ratio). These polyamine-functionalized nanoparticles can be used in the purification of biomolecules and the delivery of drugs and large biomolecules.

 

Langmuir2013 p11354 TOC

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Thumbnail Vanhove E., Ben-Amor S., Charlot S., Colin D., Devin A., Rigoulet M., Sojic N., Sékli Belaïdi F., Launay J., Temple-Boyer P., Arbault S.,I.E.E.E., Proceedings of Transducers 2013, 1135-1138....
Thumbnail Loget G., Zigah D., Bouffier L., Sojic N., Kuhn A.Acc. Chem. Res.2013, 46,2513-2523. Bipolar electrochemistry, a phenomenon which generates an asymmetric reactivity onthe surface of...
Thumbnail Shu Q., Adam C., Sojic N., Schmittel M.,Analyst 2013, 138, 4500-4504. An electrochemiluminescent sensing scheme is presented for remote detection of Hg2+ through an ITO-coated nanostructured...
Thumbnail Messager L., Portecop N., Hachet E., Lapeyre V., Pignot-Paintrand I., Catargi B., Auzély-Velty R., Ravaine V.,J. Mater. Chem. B 2013, 1, 3369-3379. We present the preparation of nanogels made...
Thumbnail Suraniti E., Vajrala S. R., Goudeau B., Bottari S., Rigoulet M., Devin A., Sojic N., Arbault S.,Anal. Chem. 2013, 85, 5146-5152. It is now demonstrated that mitochondria individually function...
Thumbnail Descamps E., Duroure N., Deiss F., Leichlé T., Adam C., Mailley P., Aït-Ikhlef A., Livache T., Nicu L., Sojic N.,Lab on a Chip 2013, 13, 2956-2962. Optical nanotip arrays fabricated on etched...
Thumbnail Pinaud F., Russo L., Pinet S., Gosse I., Ravaine V., Sojic N.,J. Am. Chem. Soc. 2013, 135, 5517-5520. The electrochemistry, photoluminescence and electrogenerated chemiluminescence of...
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Thumbnail Mokrushina A. V., Heim M., Karyakina E. E., Kuhn A., Karyakin A. A.,Electrochem. Comm. 2013, 29, 78-80. We report on the successful modification of macroporous microelectrodes with the...
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Thumbnail Valappil S. P., Yiu H. H. P., Bouffier L., Hope C. K., Evans G., Claridge J. B., Higham S. M., Rosseinsky M. J., Dalton Trans. 2013, 42, 1778-1786. Gallium has emerged as a new therapeutic agent...
Thumbnail Bon Saint Côme Y., Lalo H., Wang Z., Kohring G.W, Hempelmann R., Etienne M., Walcarius A., Kuhn A., Electroanalysis 2013, 25, 621-629. Gold nanoparticles have been co-encapsulated with d-sorbitol dehydrogenase...