A new electron paramagnetic resonance method to identify irradiated soybean.
1Food Technology Div., Bhabha Atomic Research Centre, Mumbai, India.
Journal of Food Science
|October 6, 2009
Summary
Identifying irradiated soybeans is difficult. Electron paramagnetic resonance (EPR) detects radiation-induced radicals in soybean skin, enabling differentiation of irradiated samples even after storage.
Area of Science:
- Food science
- Analytical chemistry
- Radiation chemistry
Background:
- Low-dose gamma irradiation of food presents identification challenges due to minimal matrix changes.
- Insect disinfestation of soybeans uses gamma radiation within the 0.25 to 1.0 kGy range.
Purpose of the Study:
- To investigate the potential of electron paramagnetic resonance (EPR) spectroscopy for identifying low-dose irradiated soybeans.
- To characterize radiation-induced radicals in soybean samples and assess their stability.
Main Methods:
- Soybean samples were irradiated with gamma doses from 0.25 to 1.0 kGy.
- Electron paramagnetic resonance (EPR) spectroscopy was used to analyze irradiated and non-irradiated samples.
- EPR spectrum simulation was employed to characterize induced radicals.
Main Results:
- Irradiated soybean skin exhibited a distinct triplet signal (g = 2.0046, hfcc = 3.0 mT) attributed to cellulose and phenoxyl radicals.
- Kernel samples showed a transient carbon-centered radical signal.
- Progressive saturation and thermal behavior of skin radicals proved effective for distinguishing irradiated soybeans.
Conclusions:
- EPR spectroscopy can identify low-dose irradiated soybeans by detecting specific radiation-induced radicals.
- The relaxation and thermal characteristics of these radicals offer a reliable method for distinguishing irradiated from non-irradiated or thermally treated samples, even after extended storage.
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