Rheological characteristics of potato starch/flaxseed protein concentrate composites were investigated using a rheometer. Effects of starch/protein mass ratio (0.2-1.0) and different cooling rate (2 degrees C/min. 4 degrees C/min and 6 degrees C/min) on theological behavior of composites were studied. The study showed that G' and G '' increased with increase of starch mass ratio in the temperature range of 40-95 degrees C, in both heating and cooling process. The composites exhibited similar TG'(initial) and TG'(MAX), higher than those of potato starch alone at 60.3 degrees C. The result of frequency sweep of the composites at the end of the cooling at 25 degrees C exhibited an elastic behavior at all test frequency ranges (0.06283-62.83 rad/s). Study of cooling rate on theological characteristic of composites exhibited an increase in the G' and G '' values with decrease of cooling rate, probably because of gel network having a stronger structure with more time for dynamic equilibration. (c) 2008 Elsevier Ltd. All rights reserved.