Abstract
To minimise lipid oxidation and maintain high carotenoid and tocol concentrations in wheat flours and products, fifty-seven accessions, belonging to different Triticum species (Triticum monococcum, Triticum turgidum and Triticum aestivum), were assessed for lipoxygenase activity. The highest enzymatic activity was observed in T. aestivum (8.02±0.492μmol/min/g DM), followed by T. turgidum (3.48±0.701) and by T. monococcum (0.45±0.072). While the lipoxygenase was consistently high amongst T. aestivum and steadily low amongst T. monococcum samples, the T. turgidum accessions clustered in three different groups, with low (0.12–0.91μmol/min/g DM), medium (3.10–4.17) and high (5.57–9.51) activity. Enzymatic activity was maximum in the pH range 5–6. LOX activity was higher in the germ (206μmol/min/g DM), than in the bran (13.4) or in the endosperm (3.1).The results demonstrate that the selection of genotypes with low LOX, a factor limiting oxidative degradation, is feasible.
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