Antioxidant and physicochemical properties of soluble dietary fiber from garlic straw as treated by energy-gathered ultrasound

Figures & data

Figure 1. Effects of different ultrasonic power (a) and time (b) on hydroxyl and DPPH radicals scavenging activities of SDF

Table 1. Physicochemical and functional properties of garlic straw SDF modified by ultrasound^a.

	Physicochemical properties			Functional properties
IDF	OHC (g/g)	WHC (g/g)	SC (ml/g)	CBC (mg/g)	GAC (mmol/g)
Control	5.04 ± 0.08a	6.42 ± 0.14a	5.34 ± 0.13a	8.71 ± 0.21a	4.98 ± 0.13a
Ultrasonic power (W)
50	5.40 ± 0.11b	6.99 ± 0.12c	7.49 ± 0.24b	8.98 ± 0.21ab	4.76 ± 0.11b
100	6.01 ± 0.19e	7.88 ± 0.12d	8.11 ± 0.11c	9.08 ± 0.14b	4.35 ± 0.15c
150	5.62 ± 0.08bc	8.13 ± 0.22e	8.81 ± 0.14d	9.07 ± 0.22b	4.37 ± 0.09c
200	5.66 ± 0.17cd	8.15 ± 0.08e	8.45 ± 0.38c	8.96 ± 0.14ab	4.14 ± 0.06d
Ultrasonic time (min)
5	5.41 ± 0.14b	6.67 ± 0.08b	7.59 ± 0.37b	8.71 ± 0.14a	4.78 ± 0.08b
10	5.66 ± 0.09cd	7.14 ± 0.06c	8.29 ± 0.22c	9.05 ± 0.11b	4.68 ± 0.11b
20	6.01 ± 0.19e	7.88 ± 0.06d	8.11 ± 0.11c	9.08 ± 0.13b	4.35 ± 0.15c
30	5.85 ± 0.12de	8.09 ± 0.13de	8.37 ± 0.09c	9.40 ± 0.13c	4.43 ± 0.10c

^aThe values represent means of triplicate ± standard deviation. Values in the same column with different letters are significantly different (P < 0.05).

Figure 2. Rheological properties of SDF from garlic straw. (a) Viscosity as a function of the shear rate; (b) Shear stress as a function of shear rate

Figure 3. Effect of ultrasound pretreatment on the surface morphology of SDF. (a) Control; (b) SDF treated by ultrasound at power of 100 W and time of 20 min

Figure 4. Effect of ultrasound pretreatment on the height of SDF. (a) Control; (b) SDF treated by ultrasound at power of 100 W and time of 20 min

Figure 5. FTIR spectra of SDF from garlic straw. (a) Control; (b) SDF treated by ultrasound at power of 100 W and time of 20 min