Research based on wort separation problems in a grain distillery indicated
that prolonged holding of cooked maize caused the production of significant
quantities of resistant starch, which was mainly present in the fine mash
solids. Mashes containing resistant starches were difficult to filter and t
his filtration difficulty did not reflect differences in beta -glucan conte
nt or clear wort viscosities. The conversion efficiency and fermentability
of the worts from slow-filtered mashes were reduced. The resistant starch m
aterial was associated with a white residue, which was soluble in dilute al
kali but not in hot water, and stained positively for starch in alkaline so
lution but not in water.