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Electron paramagnetic resonance (EPR) study of the short - living radicals generated thermally in phosphorylated maize starch with different amounts of amylose

Bidzińska E., Dyrek K., Kruczała K., Szczygieł J., Wenda E., Błaszczak W., Fornal J.

Nukleonika

2013

Vol. 58, No. 3

429--433

Quantitative electron paramagnetic resonance (EPR) spectroscopy was used for the determination of a number and properties of short-living radicals generated thermally in maize starch with various amounts of amylose. The EPR spectra of radical adducts with N-tert-butyl-α-phenylnitrone (PBN) spin trap reveal the presence of three types of radicals of mobility related with their localization in the zones of various degree of crystallinity. Hylon VII, which represents a matrix with a high content of amylose, offers better conditions for free rotation of radical species, whereas waxy maize, containing almost exclusively amylopectin, exhibits more restricted dynamics.

Intramolecular transformation of thiyl radicals to a-aminoalkyl radicals: ab initio calculations on homocystein

Chhun S., Berges J., Bleton V., Abedinzadeh Z.

Nukleonika

2000

Vol. 45, nr 1

19-22

One-electron oxidation of thiols by oxidizing radicals leads to the formation of thiyl and carbon-centered radicals. It has been shown experimentally that in the absence of oxygen, the thiyl radicals derived from certain thiols of biological interest such a glutathione, cysteine and homocysteine decay rapidly by intramolecular rearrangement reactions into the carbon-centered radical. In the present work we have investigated theoretically the structure and the stability of thiyl and carbon-centred radicals of homocystein in order to check the possibility of this rearrangement.