Abstract
The rates of water absorption of three maizes, dent (PIONEER 3379), semident (ICI RF 67) and flint (CARGILL T-42), in plain water and 0.25% SO 2 aqueous solution were studied. The steeping temperatures were 45, 55 and 65 °C. The absorption kinetics in plain water and SO 2 solution follows a ‘Fickian’ behavior (moisture content of the kernels varies with the square root of time) during the first hours of steeping. The rates of absorption in SO 2 solution were slightly higher than in plain water at all temperatures, even though at the onset of steeping, the SO 2 seemed to retard the rate of absorption. This increase was relatively higher for flint and semident types than for dent maize. The activation energies for water sorption in SO 2 solution were lower than for plain water, this effect being more marked for flint and semident types.
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