Effect of temperature on dynamic and steady-state shear rheological properties of siriguela (Spondias purpurea L.) pulp

Abstract

The present work has evaluated the dynamic and steady-state shear rheological properties of siriguela (Spondias purpurea) pulp as function of temperature (0–80 °C), as well as the applicability of the Cox-Merz rule. The product flow behavior could be well described by the Herschel–Bulkley’s model (R2 > 0.98), whose parameters were modeled as function of temperature (R2 > 0.91). The product has shown a weak gel behavior, with storage modulus higher than loss modulus in the evaluated frequency range. The storage and loss modules could be well described by a power function of the oscillatory frequency (R2 > 0.93), whose parameters were modeled as function of temperature (R2 > 0.97). Moreover, a power modified Cox-Merz rule could describe the rheological properties of S. purpurea pulp (R2 > 0.96). The obtained data are potentially useful for future studies on food properties and process design.

The authors thank the São Paulo Research Foundation (FAPESP) for funding Project No. 2010/05241-8.