ELECTRON-SPIN-RESONANCE MEASUREMENTS ON D RIED FRUITS - SUGAR COMPOSITION AND ESR SIGNAL STRUCTURE OF IRRADIATED FRUITS

While in a previous work the ESR spectroscopic detection of irradiated dried fruits was reported, in this paper liquid chromatographic deter mination of the carbohydrate fraction of these fruits is introduced an d connected with the ESR results. After irradiation of dried fruits th ree different types of ESR spectra are observed. In most cases the dri ed fruits can be attached to these various types by means of their sug ar composition. It was also found that the ESR spectra observed for su crose-rich fruits are very similar to that of pure sucrose. The struct ure of the ESR spectra can change with storage. Probably, radical rear rangement reactions in the samples are responsible for these changes.