2.5.3 Frequency scanning
Strain scan results were used to determine the linear viscoelastic region (LVE) of the walnut butter. The samples were placed as uniformly as possible between the plates. The frequency was fixed at 10 rad/s or 1 Hz and the stress variation range was set to 0.01% - 100%.
The viscoelastic properties of the walnut butter was determined by selecting the small amplitude dynamic frequency scan mode. Depending on the measurement, the strain was fixed at 0.01% (linear viscoelastic region). In the linear state, the scanning frequency was set from 0.1 rad/s to 100 rad/s. The numerical changes of the energy storage modulus (G’) and the energy dissipation modulus (G”) were recorded.