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Free Radical Fprmation in Amino Acids Exposed to Hydrogen Atoms

V. Nothig-Laslo ; Institute »Ruder Boskovic«, Zagreb, Croatia, Yugoslavia
J. N. Herak ; Institute »Ruder Boskovic«, Zagreb, Croatia, Yugoslavia

Sažetak

Electron spin .resonance spectroscopy has been used to identify
free radicals formed in powdered amino acids by the exposure to
thermal hydrogen atoms at 77°K. The low temperature ESR spectra
of the radicals produced at 77°K are different from the spectra at
room temperature. The primary radicals are those produced by the
abstraction of H atoms from the common part of amino acids (in
the zwitter-ion compounds) or from some position of the amino
acid residue (in neutral compounds). In most amino acids a reversible
change of the radical conformation was observed. The irreversible
change of the isoleucine resonance pattern is attributed to
the change of the unpaired electron from the sp3 to the p orbital.
Different conformations of radicals at room temperature when they
are produced at 77° and at 300°K are interpreted by the difference
in the crystal lattice arrangement in the vicinity of the radical.

Ključne riječi

Hrčak ID:

197333

URI

https://hrcak.srce.hr/197333

Datum izdavanja:

20.4.1971.

Posjeta: 432 *