Abstract
Radiation-induced free radicals and luminescence properties were investigated in γ-irradiated (0-3 kGy) pomegranate (Punica granatum L.) fruits. Photostimulated luminescence (PSL) analysis showed limited applicability, and only 3 kGy-irradiated pomegranates showed positive PSL values (>5000 PCs). Thermoluminescence (TL) glow curve features, such as intensity and the presence of maximum glow peak in radiation-specific temperature range (150-250 C), provided definite proof of irradiation, and the TL ratios (TL 1/TL2) also confirmed the reliability of TL results. Scanning electron microscopy energy dispersive X-ray (SEM-EDX) analysis of the separated minerals showed that feldspar and quartz minerals were responsible for the luminescence properties. Radiation-induced cellulose radicals were detected in the seeds and rinds by ESR analysis. The ESR results were better in freeze-dried samples than in alcohol-extracted ones. A positive correlation was found between the ESR and TL signal intensities and irradiation doses; however, the most promising detection of the irradiation status was possible through TL analysis.
| Original language | English |
|---|---|
| Pages (from-to) | 4019-4025 |
| Number of pages | 7 |
| Journal | Journal of Agricultural and Food Chemistry |
| Volume | 61 |
| Issue number | 17 |
| DOIs | |
| Publication status | Published - May 1 2013 |
| Externally published | Yes |
Keywords
- γ-irradiation
- electron spin resonance
- identification
- photostimulated luminescence
- pomegranate
- quarantine
- thermoluminescence
ASJC Scopus subject areas
- General Chemistry
- General Agricultural and Biological Sciences