fraction showed the highest MV25 value, whereas the larger particle fractions (>180) showed the least values, clearly indicating that the higher the particle size the higher the chance of starch conversion. As expected, for all treatments there were no peak viscosity at 95 °C (typical of raw and intermediary cooked starch based materials), as a result of the severe condition necessary to produce directly expanded extrudates. The average particle sizes present no effect on the MV95 values. MV95 indicates the start of cooling period and may represents the extent of converted starches forms that are unable to keep their structure integrity and entanglements with vicinal dispersed starch molecules thus a reduction of paste viscosity occurs (ozcan and Jackson, 2005). When hot pastes are cooled, the extent of increase in viscosity is governed by the reassociation tendency of the starch as reported by Hagenimana association et al. (2006). The re-association was reported for extruded rice flour.