Alkanes and alkenes can be produced from lipids in maize, brown rice, and wheat by irradiation. The purpose of this study was to determine whether the detection pattern of the hydrocarbons can be used for identifying postirradiation of cereals. Maize, brown rice, and wheat were irradiated at 0.5, 1, and 3 kGy. Oils were extracted from the samples using hexane and anhydrous Na 2 SO 4 . Hydrocarbon‐containing fractions, isolated using Florisil column chromatography, were analyzed using gas chromatography (GC). The first six Florisil column chromatography fractions of 10 mL each were collected. Prominent radiation‐induced alkenes 17∶1, 16∶2, 17∶2, and 16∶3 appeared mainly in the third, fourth, and fifth fractions. Those three fractions were combined and evaporated to a total volume of 4 mL for GC analyses. Alkenes 17∶1, 16∶2, 17∶2, and 16∶3 were detected in all irradiated samples but not in the non‐irradiated ones. The levels of the hydrocarbons changed little by roasting the nonirradiated and irradiated cereals.
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Hwang et al. (2001) studied this question.
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