Effects of High Hydrostatic Pressure on Rheological Properties of Rice Starch

Figures & data

TABLE 1 Pasting properties of HHP-treated rice starch (30 min) at different pressures from rotational rheometers

Pressure (MPa)	PV (Pa. s)	TV (Pa. s)	BD (Pa. s)	FV (Pa. s)	SB (Pa. s)	PT (min)
0.1	0.265 ± 0.007^b	0.235 ± 0.052^c	0.030 ± 0.004^c	0.569 ± 0.036^e	0.334 ± 0.019^d	11.5 ± 0.2^b
120	0.106 ± 0.014^d	0.065 ± 0.009^e	0.041 ± 0.009^c	0.785 ± 0.031^c	0.720 ± 0.036^b	10.5 ± 0.1^c
240	0.098 ± 0.004^d	0.078 ± 0.004^e	0.020 ± 0.001^d	0.940 ± 0.010^b	0.862 ± 0.014^a	10.7 ± 0.3^c
360	0.183 ± 0.027^c	0.111 ± 0.008^d	0.072 ± 0.009^b	0.856 ± 0.013^c	0.745 ± 0.023^b	10.3 ± 0.0^c
480	0.985 ± 0.324^a	0.852 ± 0.0167^b	0.133 ± 0.018^a	0.686 ± 0.048^d	0.166 ± 0.019^e	16.8 ± 0.3^a
600	1.077 ± 0.396^a	1.040 ± 0.145^a	0.037 ± 0.005^c	1.593 ± 0.173^a	0.533 ± 0.021^c	17.2 ± 0. 1^a

All values are means of triplicate determinations ± SD. Means within columns with different letters are significantly different (p < 0.05).

PV: peak viscosity; TV: trough viscosity; BD: breakdown; FV: final viscosity; SB: setback; GT: pasting temperature; PT: peak time.

FIGURE 1 Variation of (a) storage modulus and (b) loss modulus for HHP-treated rice starch (30 min) at different pressures. Measurements were made at 25°C and 0.5% strain.

FIGURE 2 Flow curves of HHP-treated rice starch (30 min) at different pressures.

FIGURE 3 Apparent viscosity of HHP-treated rice starch (30 min) at different pressures.

FIGURE 4 Shear thinning of HHP-treated rice starch (30 min) at different pressures.

FIGURE 5 Experimental hysteresis area values of HHP-treated rice starch (30 min) at different pressures.