Samples. Different cereal products were purchased in local stores
(corn and oat) or supplied by research institutes (wheat, spelt, triticale,
and barley). Cereal samples were collected according to standard
sampling procedures and were stored at 4 °C. Immediately before
analysis, the samples were ground in a Cyclotec 1093 laboratory mill
with a 0.5 mm sieve (FOSS Italia, Padova, Italy) and carefully mixed