Flavour and stability of rye grain fractions in relation to their chemical composition
In addition to distinctive sensory and chemical properties of wholegrain flour, endosperm-rich fraction
and two differently prepared bran,
The high content of phenolic compounds of bran contributing to its bitterness probably also improved its stability by reducing the formation of flavour-active lipid-derived oxidation products.
Stability of the rye bran made by an air-classification process
was inferior to the bran made by a conventional sieving process, despite similar content of phenolic compounds.
Changes in the development rate of rancidity and intensity of flavour were faster in the air-classified than in the sieved bran.
This could be due to different microstructure and particle size of the bran,
influencing oxidation susceptibility.