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E.s.r. of spin-trapped radicals in aqueous solutions of amino acids. Reactions of the hydrated electron. 1977

S Rustgi, and A Joshi, and P Riesz, and F Friedberg

The reactions of hydrated electrons (eaq-) with amino acids were investigated by the spin-trapping method and by electron spin resonance. Tertiary nitrosobutane was used as a spin-trap to stabilize the short-lived radicals. Hydrated electrons were produced by gamma-radiolysis of de-aerated aqueous solutions of amino acids in the presence of sodium formate or tertiary butanol to scavenge OH. Radicals produced by reductive deamination of 19 amino acids were identified. Radicals formed by scission of the CH3-S- and -S-CH2- bonds of methionine as well as by deamination were observed. In the case of phenylalanine the radical formed by electron addition followed by proton transfer was identified. The reaction of proline and of hydroxyproline with eaq- resulted in the opening of the cyclic structure.

UI MeSH Term Description Entries
D009603 Nitroso Compounds Organic compounds containing the nitroso (-N Compounds, Nitroso
D003641 Deamination The removal of an amino group (NH2) from a chemical compound. Deaminations
D004578 Electron Spin Resonance Spectroscopy A technique applicable to the wide variety of substances which exhibit paramagnetism because of the magnetic moments of unpaired electrons. The spectra are useful for detection and identification, for determination of electron structure, for study of interactions between molecules, and for measurement of nuclear spins and moments. (From McGraw-Hill Encyclopedia of Science and Technology, 7th edition) Electron nuclear double resonance (ENDOR) spectroscopy is a variant of the technique which can give enhanced resolution. Electron spin resonance analysis can now be used in vivo, including imaging applications such as MAGNETIC RESONANCE IMAGING. ENDOR,Electron Nuclear Double Resonance,Electron Paramagnetic Resonance,Paramagnetic Resonance,Electron Spin Resonance,Paramagnetic Resonance, Electron,Resonance, Electron Paramagnetic,Resonance, Electron Spin,Resonance, Paramagnetic
D004583 Electrons Stable elementary particles having the smallest known negative charge, present in all elements; also called negatrons. Positively charged electrons are called positrons. The numbers, energies and arrangement of electrons around atomic nuclei determine the chemical identities of elements. Beams of electrons are called CATHODE RAYS. Fast Electrons,Negatrons,Positrons,Electron,Electron, Fast,Electrons, Fast,Fast Electron,Negatron,Positron
D005720 Gamma Rays Penetrating, high-energy electromagnetic radiation emitted from atomic nuclei during NUCLEAR DECAY. The range of wavelengths of emitted radiation is between 0.1 - 100 pm which overlaps the shorter, more energetic hard X-RAYS wavelengths. The distinction between gamma rays and X-rays is based on their radiation source. Gamma Wave,Gamma Radiation,Nuclear X-Rays,Radiation, Gamma,X-Rays, Nuclear,Gamma Radiations,Gamma Ray,Gamma Waves,Nuclear X Rays,Nuclear X-Ray,Ray, Gamma,Wave, Gamma,Waves, Gamma,X Rays, Nuclear,X-Ray, Nuclear
D000596 Amino Acids Organic compounds that generally contain an amino (-NH2) and a carboxyl (-COOH) group. Twenty alpha-amino acids are the subunits which are polymerized to form proteins. Amino Acid,Acid, Amino,Acids, Amino
D014867 Water A clear, odorless, tasteless liquid that is essential for most animal and plant life and is an excellent solvent for many substances. The chemical formula is hydrogen oxide (H2O). (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed) Hydrogen Oxide

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