Application of high-intensity ultrasound to modify the rheological properties of a guamuchil Pithecellobium dulce (Roxb.) seed protein isolate

Figures & data

Figure 1. Impact of high-intensity ultrasound on the moduli of storage G’ (A) and loss G” (B) of guamuchil protein isolate in function of strain sweep. For each treatment the numerator and denominator represent the power and time of exposure to ultrasound, respectively.

Figure 2. Impact of high-intensity ultrasound on the moduli of storage G’ (A) and loss G” (B) of guamuchil protein isolate as function of frequency sweep. For each treatment the numerator and denominator represent the power and time of exposure to ultrasound, respectively.

Figure 3. Impact of high-intensity ultrasound on the moduli of storage G’ (A) and loss G” (B), and loss tangent of guamuchil protein isolate as function of temperature sweep. For each treatment the numerator and denominator represent the power and time of exposure to ultrasound, respectively.

Figure 4. Effect of ultrasound on the apparent viscosity (η_app) of guamuchil protein isolate as function of shear rate (γ).

Table 1. Impact of high-intensity ultrasound on η₀ (zero viscosity), η_∞ (infinity viscosity), m* (rate constant), and 1/C (critical shear rate) parameters of guamuchil protein isolate generated by Cross model.

Ultrasound treatment	η0 x10^6 (Pa·s)	η∞ (Pa·s)	m* (dimensionless)	1/C (s^−1)	R^2
0 W	5.209 ± 0.162^a	0.661 ± 0.110^a	0.900 ± 0.041^d	0.079 ± 0.009^a	0.9980
200 W/15 min	2.893 ± 0.132^b	0.474 ± 0.031^b	1.140 ± 0.022^c	0.031 ± 0.005^d	0.9988
200 W/30 min	2.502 ± 0.087^c	0.126 ± 0.011^c	1.221 ± 0.051^b	0.014 ± 0.008 ^f	0.9976
400 W/15 min	0.175 ± 0.010^d	0.086 ± 0.001^d	1.080 ± 0.080^c	0.051 ± 0.001^c	0.9963
400 W/30 min	0.036 ± 0.003^e	0.056 ± 0.004^e	1.090 ± 0.065^c	0.060 ± 0.003^b	0.9964
600 W/15 min	0.001 ± 0.000 ^g	0.028 ± 0.002 ^f	1.200 ± 0.081^b	0.022 ± 0.002^e	0.9968
600 W/30 min	0.002 ± 0.000 ^f	0.011 ± 0.001 ^g	1.335 ± 0.041^a	0.010 ± 0.001 ^f	0.9982

Results are expressed as the average of triplicates ± standard deviations. Different superscripts within the same column are significantly different (p < 0.05). 0 W is the control treatment without ultrasound. For each treatment the numerator and denominator represent the power and time of exposure to ultrasound, respectively.