A new approach for extension of the identification period of irradiated cellulose-containing foodstuffs by EPR spectroscopy

  • Yordanov N
  • Gancheva V
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Abstract

We report on the possibility of identification by EPR spectroscopy of some irradiated cellulose-containing foodstuffs, at a relatively long time after the irradiation, when the characteristic EPR spectral lines of the cellulose free radical have essentially disappeared. In such cases rather expensive and time-consuming methods (e.g. thermoluminescence analysis) have to be applied. The present communication demonstrates with some pre- irradiated spices, dried medicinal and sweet herbs that simply heating the samples to 60°C for one hour leads to a significant (50% or more) decrease of the EPR intensity of the remaining central line of the samples. For comparison, the loss in the intensity of the same line upon heating non- irradiated samples at 60°C for one hour was only about 10%. This inexpensive new procedure will extend the post-irradiation period in which EPR can be used for distinguishing irradiated from non-irradiated samples, of certain cellulose-containing foodstuffs.

Author-supplied keywords

  • EPR
  • Foodstuffs
  • Radiation

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Authors

  • Nicola D. Yordanov

  • Veselka Gancheva

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