RESUMO
The formation of metal-containing Ag-mercaptoethanol (-Ag-S(R)-)(n) complexes on DNA chain scaffold was studied by UV spectroscopy, zeta potential measurement, and fluorescence and transmission electron microscopies. Experimental results made clear the mechanism of DNA mineralization and compaction, according to which intercalation of silver cations into DNA scaffold and further formation of (-Ag-S(R)-)(n) oligomeric complexes on DNA induce efficient DNA chain compaction by terminal Ag(+) cations. By transmission electron microscopy the formation of fiber-like DNA-templated nanostructures was observed. DNA-Ag-thiol complexes are promising for DNA-templated engineering of hybrid 1D nanostructures with adjustable chemical functionalities by choosing appropriate thiol ligand.
Assuntos
DNA Viral/química , Nanofibras/química , Prata/química , Compostos de Sulfidrila/química , Bacteriófago T4/química , Cátions/química , Tamanho da Partícula , Propriedades de SuperfícieRESUMO
DNA cross-linked hydrogel was used as a matrix for synthesis of gold nanoparticles. DNA possesses a strong affinity to transition metals such as gold, which allows for the concentration of Au precursor inside a hydrogel. Further reduction of HAuCl4 inside DNA hydrogel yields well dispersed, non-aggregated spherical Au nanoparticles of 2-3 nm size. The average size of these Au nanoparticles synthesized in DNA hydrogel is the smallest reported so far for in-gel metal nanoparticles synthesis. DNA hybrid hydrogel containing gold nanoparticles showed high catalytic activity in the hydrogenation reaction of nitrophenol to aminophenol. The proposed soft hybrid material is promising as environmentally friendly and sustainable material for catalytic applications.
Assuntos
DNA/química , Ouro/química , Hidrogel de Polietilenoglicol-Dimetacrilato/química , Nanopartículas Metálicas/química , Animais , Catálise , Tamanho da Partícula , SalmãoRESUMO
Invited for this month's cover is the group of Prof. Shizuaki Murata and Dr. Anatoly Zinchenko from Nagoya University and the group of Prof. Vladimir Sergeyev from Moscow State University. The cover picture shows the accumulation of noble and rare-earth metals by DNA cross-linked hydrogel. Read the full text of the article on pageâ 619â ff..
RESUMO
Treasure trove: A method for the extraction of noble and rare-earth metals by a DNA cross-linked hydrogel, based on high DNA affinity to these elements, is described. The hydrogel is promising in applications for metal accumulation and recycling.