engleski

EPR study of radiation induced radicals in different polymorphic forms of trehalose

Trehalose, a non-reducing disaccharide is a subject of common interest in many research areas such as biology, chemistry, food chemistry, pharmaceutics, bioscience etc. Trehalose like other disaccharides was intensively studied due to its bio-protection properties such as anhydrobiosis or cryoprotection, which refer to their ability to allow organisms to survive under extreme dehydration or freezing conditions 1. Although this mechanism is still not properly understood, many researchers believe that protection of the biomaterials and living organisms under extreme conditions is associated with properties of amorphous matrices, being inversely related to the degree of crystallization2. Consequently, the polymorphism of trehalose has been the subject of intense research in recent time. On the other hand, trehalose is suitable as a model system for investigation of the nature and reactions of radicals induced by direct radiation effects in the deoxyribose sugar of DNA 3. Furthermore, understanding the behavior of radiation-induced defects in trehalose in different polymorphic forms is important for radiation dosimetry purposes 4 and for the detection and characterization of irradiated final products in the pharmaceutical and food industry. The aim of this study was to investigate EPR response of radiation induced radicals in different polymorphic forms of trehalose. Number of free radicals, thermal stability and decay kinetics of EPR signals in γ-irradiated trehalose in different polymorphic forms were investigated using isothermal and isochronal annealing experiments.

trehaloza; zračenje; koncentracija spinova; EPR

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