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Studying of Isotopic Effects of Deuterium in Biological Objects



Authors: Oleg Mosin si Ignat Ignatov

Moscow State University of Applied Biotechnology, Russian Federation
Senior research Fellow of Biotechnology Department, PhD (Chemistry)
Talalihina Str., 33, Moscow, 103316
The Scientific Research Center of Medical Biophysics (SRC MB), Bulgaria
Professor, Doctor of Science, director of SRC MB.
N. Kopernik Str., 32, Sofia, 1111

European Reviews of Chemical Research, 2015, Vol.(3), Is. 1

Abstract
This article describes the data on isotopic effects of deuterium in various biological objects as the cells of methylotrophic, chemoheterotrophic, photoorganotrophic microorganisms, green algae as well as animal cells. It was demonstrated that the increased content of deuterium in water leads to physiological, morphological and cytology alterations of the cell, and also renders negative influence on cellular metabolism, while deuterium depleted water (DDW) with decreased deuterium content on 20–30 % exerts beneficial effects on organism. The maximum kinetic isotopic effect measured at ordinary temperatures in chemical reactions leading to rupture of bonds involving hydrogen and deuterium lies in the range kH/kD = 6–8 for C–H versus C–D, N–D versus N–D, and O–H versus O–D-bonds. By IR-spectroscopy method water samples with varying content of deuterium were investigated.

Highlights:

• Isotopic effects of deuterium in biological objects
• Biological effects of DDW

Conclusion
Isotopic effects are determined by an increase in the nuclear mass of deuterium relative to protium, which may be sufficiently essential for the 1H/2H pair. The maximum kinetic isotopic effect measured at ordinary temperatures in chemical reactions leading to rupture of bonds involving hydrogen and deuterium lies in the range kH/kD = 6–8 for C–H versus C–D, N–D versus N–D, and O–H versus O–D-bonds. D2O of high content of deuterium (99,8 at.%) leads to physiological, morphological and cytology alterations of the cell, and also renders negative influence on cellular metabolism, while DDW with decreased deuterium content on 20–30% exerts beneficial effects on metabolism. The most sensitive to replacement of ? on D are the apparatus of biosynthesis of macromolecules and a respiratory chain, i.e., those cellular systems which use high mobility of protons and high speed of breaking up of hydrogen bonds.

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