The effects of roller and impact milling on differently conditioned oat groats
have been compared by Doehlert and Moore (1997). Tempering oats to 12%
moisture improved bran yield from roller milling nearly twofold, but had little
effect on bran composition. Bran yield from the impact- type mill was signifi cantly
affected by grinding screen size. Bran generated with 2.0 and 3.0 mm grinding
screens on the mill had signifi cantly higher starch concentration and signifi cantly
lower protein, β -glucan and ash concentrations than brans produced with 0.5
and 1.0 mm grinding screen sizes. Wang et al. (2007) combined dry milling
with a pearling process, which effi ciently removed trichomes and surface- borne
aluminium and microbial contamination.