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 bran, intense and bitter in flavour, but more stable, had the highest content of phenolic compounds.
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.