Effect of flaxseed gum addition on rheological properties of native maize starch

Both small amplitude oscillatory and steady shear measurements were carried out at 25 oC, 50 oC, and 75 oC in order to determine the  rheological properties of the mixtures of flaxseed gum (0.1-0.5%) and native maize starch (3%). It was found that the apparent viscosities of the samples increased with the increasing of flaxseed gum concentration. The apparent viscosities of the samples were fitted well to the power law model (the values of R2 were between 0.954 and 0.999). The consistency index (K) of the gum  starch mixtures increased with the increasing of flaxseed gum concentration. The gum  starch mixtures showed gel-like behaviour since the storage modulus (G') was much larger than the loss modulus (G'') and the frequency dependence of both modulus was not significant. The G' and G'' of the gum  starch mixtures was increased with the increasing of flaxseed gum concentration. The influence of temperature was more significant for the flaxseed gum maize starch mixtures compared to maize starch gel. Author's Abstract