Dynamics of Water in Binary and Ternary Solutions of DNA and Porphyrins

Authors:
V. T. Lebedev, Yu. V. Kulvelis, Gy. Török
The year of the publication:
2010
Journal:
Physics of the Solid State N 5 vol. 52 1074-1079
Keywords:
Porphyrin, Momentum Transfer, Heavy Water, Porphine, Ternary Solution
Abstract:

The dynamics of heavy water (at 20°C) in solutions with polyanionic DNA chains and ternary systems containing DNA and negatively charged tetraphenylporphyrins has been investigated using neutron resonance spin echo in the time range t = 1–1000 ps. The diffusion dynamics has been observed in the momentum transfer range q = 1.3–1.8 Å–1, and the relaxation rates in single-component, binary, and ternary systems are close to each other. Apart from the relaxation, the vibrational mode in the solutions has been revealed at the momentum transfer q = 1.9 Å–1. The introduction of porphyrins into the solution (one molecule per ten DNA base pairs) has resulted in a retardation of diffusion and a considerable increase (by 5–10%) in the frequency of translational vibrations of water molecules due to the interaction with porphyrin molecules.

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