I. NACHEVA1, K. ALEKSIEVA2, K. DIMOV1, D. MITEVA1 and Tsv. TSVETKOV1
1 Institute of Cryobiology and Food Technologies, BG - 1407 Sofia, Bulgaria
2 Bulgarian Academy of Sciences, Institute of Catalysis, Molecular Catalysis with Center of EPR Spectroscopy, BG - 1113 Sofia, Bulgaria
NACHEVA, I., K. ALEKSIEVA, K. DIMOV, D. MITEVA and Tsv. TSVETKOV, 2013. Identification of gamma irradiated lyophilized forest fruits by EPR Spectroscopy. Bulg. J. Agric. Sci., 19: 293-297
The objective of the present study was to prove the radiation treatment of a set of lyophilized forest fruits (blackberry, blueberry, aronia, strawberry and black elder), irradiated with doses of 2 and 4 kGy by the method of Electronic Paramagnetic Resonance (EPR). A low intensive singlet line was registered for all samples before the irradiation. The results show that after irradiation the intensity of the natural signal is increased, as the so-called “cellulose like” EPR spectrum was registered only for aronia. From the studied lyophilized fruits, according to the protocol for irradiated foods, containing cellulose (EN 1787), and radiation treatment can be proved only for aronia. Protocol EN 13708 for irradiated foods, containing crystalline sugar is not applicable for these samples.
Key words: EPR spectroscopy, gamma irradiation, lyophilization, forest foods