Stress relaxation characteristics of seven kinds of starch gels

The parameters of mechanics and theological properties of seven different starch gel samples were investigated.In order to obtain the parameters,the texture analyzer was employed to perform the compression and the stress- relaxation test.The mechanical model of generalized Maxwell was set up by using the SPSS software to make non- linear regression. It showed that starch gels had favorable viscoelastic mechanical property during compression,the five elements of general Maxwell model can be applied to simulate the stress- relaxation phenomenon in starch gels. Through principal component analysis,stress- relaxation parameters can be summarized into two kinds,which was gel viscoelastic property and gel relaxation time.