Re: Irradiated Spinach to Start Tomorrow... Dimethyethyl Benzene by-product.

[Guest guest]

Watch what you eat, especialy if imported from unregulated Countries.

To detect irradiated powdered foodstuffs, Korean researchers have

compared the volatile compounds present in untreated and gamma ray-

treated beef extract powder. Samples were vacuum packed, irradiated

with 1-10kGy doses and stored for up to 30 days. Volatiles were

extracted by solid-phase microextraction (SPME) or purge-and-trap

(P & T) methods and identified by gas chromatography/mass spectrometry.

The extraction methods proved to be complementary: P & T was more

efficient for low-molecular-mass and highly volatile compounds; SPME

preferentially extracted less volatile species. Out of 61 compounds

extracted by SPME and 70 compounds by P & T, only one suitable marker

compound for irradiation was detected: 1,3-bis(1,1-dimethylethyl)

benzene was absent in untreated food but was produced upon gamma-ray

irradiation, its concentration correlating with increasing radiation

doses.

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> > > It.

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