Abstract
Dynamic shear rheological properties of salep–corn starch mixture (SCSM), salep–wheat starch mixture (SWSM) and salep–potato starch mixture (SPSM) samples were determined using a 2-factor-5-level Central Composite Rotatable Design (CCRD). Salep increased loss modulus (G″) values, and decreased loss tangent (tan δ) values of only SCSM; however, all starch types increased the storage (G′), loss (G″), complex (G∗) modulus, complex viscosity (η*) values and decreased tan δ values. At various salep and starch combination levels, a remarkable synergistic effect was observed in the dynamic shear properties. Potato starch exhibited completely different rheological performance in terms of G′, G″ and η∗ values. Salep did not obey the Cox–Merz rule; however, a modified Cox–Merz rule was applicable for SCSM and SPSM samples. The ridge analysis revealed that maximum G′, G″, η* and G∗ values for the SCSM, SWSM and SPSM samples would occur at salep = 0.54% and 0.26%, respectively, and each starch type = 2.83%.
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