Effect of carboxymethylcellulose(CMC) and microcrystalline cellulose(MCC) at different concentrations on rheological and thermal properties of wheat starch(WS) pastes was investigated. Steady shear rheological tests showed that the magnitudes of consistency index (K) of 6%CMC and 4%MCC were 27.48 (Pa sn ) and 32.20(Pa sn ),respectively, which were significantly higer than control 10.81(Pa sn ).The apparent viscosity (?a,100) of  WS prepared with added 6%CMC and 4%MCC were 1.33 and 1.65 times greater than control. Meanwhile, flow behavior index of 6%CMC and 4%MCC were lower than control. Dynamic rheological tests showed that the dynamic modulus (G',G�) were reduced by adding 4%CMC and 6%MCC .The G' and G� values of 4%CMC (65.2 Pa and 14.0 Pa) and 6%MCC (52.2 Pa and 12.6 Pa) were lower than that (118.9 Pa and 19.5) of control at the frequency 1Hz. In addition, thermal properties studied by DSC showed that the presence of CMC or MCC resulted in an increase in the transition temperatures (To,Tp, and Tc) and a decrease of the gelatinization enthalpy (?H).In general, the rheological and thermal properties modifications were dependent on the cellulose derivative type and concentration.Acknowledgement:  Supported by the National 973 project under Grant No. 2010CB732201, the National Natural Foundation of China under Grant No. 31270617.

Effect of cellulose derivatives on rheological and thermal properties of wheat starch pastes

248th National Meeting (2014)

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