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- Title
Thermal and EPR Study of DNA -- Based Membranes.
- Authors
FIRMINO, A.; SILVA, I. D. A.; NETO, S. CLARO; MAGON, C. J.; DONOSO, J. P.; KAJZAR, F.; KANICKI, J.; PAWLICKA, A.
- Abstract
The present paper focuses on the results obtained from impedance spectros-copy, thermal analysis (DSC and DMA) and electron paramagnetic resonance (EPR) of membranes of DNA plasticized with glycerol and containing either poly(cthylene dioxylhiophcne) (PEDOT) or Prussian Blue (PB) and copper perehlorale (CuClO4). The ionic conductivity values for the DNA-PEDOT-CuClO4 and DNA-PB-CuClO4 of 4.8x10-4 S/cm and 2.2x10-4 S/cm at 30 °C, respectively, were obtained. The DSC analysis of the samples showed two glass transition temperatures at about -80 and 50 °C and DMA a permanent deformation above 50 °C ascribed to a transition between elastic and plastic states. The EPR spectra evidenced that Cu2+ ions are in tetragonally distorted octahedral sites and the quantitative analysis of the EPR spin Hamiltonian g|| and A|| parameters revealed copper ions complexed by nitrogen and oxygen atoms. All these results suggest that DNA-biomembrancs are interesting materials to be used in materials engineering science.
- Subjects
DNA; PLASTICIZERS; THERMAL analysis; ELECTRON paramagnetic resonance; GLYCERIN
- Publication
Nonlinear Optics, Quantum Optics: Concepts in Modern Optics, 2015, Vol 47, Issue 1-3, p45
- ISSN
1543-0537
- Publication type
Article