Table 1 Rheological properties of native and modified DASP from apple and carrot. G′, elastic (storage) modulus; G″, viscous (loss) modulus; tan δ, loss factor; K, consistency coefficient; n, flow index; G0, initial shear stress.
Parameter | Unit | Pectin source | |||||||
---|---|---|---|---|---|---|---|---|---|
Apple | Carrot | ||||||||
BUFFER | E1 (RGAE + RGL) | E2 (ABF) | E3 (RGAE + RGL + ABF) | BUFFER | E1 (RGAE + RGL) | E2 (ABF) | E3 (RGAE + RGL + ABF) | ||
G′ | Pa | 310.83 ± 231.30ab | 1154.61 ± 139.91a | 32.29 ± 17.23ab | 338.77 ± 145.85ab | 405.53 ± 28.92b | 167.26 ± 154.87ab | 43.67 ± 25.38ab | 207.33 ± 119.49ab |
G′/G″ | 7.52 ± 3.14ab | 10.74 ± 1.42b | 4.38 ± 0.99ab | 8.34 ± 1.43ab | 6.77 ± 0.51ab | 6.44 ± 1.08ab | 3.51 ± 0.93a | 6.93 ± 2.48ab | |
tan δ | 0.14 ± 0.00abc | 0.09 ± 0.01bc | 0.24 ± 0.05a | 0.13 ± 0.03ab | 0.15 ± 0.01abc | 0.16 ± 0.03abc | 0.30 ± 0.07c | 0.15 ± 0.07ab | |
Flow point | % | 6.07 ± 3.83ab | 5.76 ± 1.26bc | 16.09 ± 4.50ab | 3.77 ± 1.95a | 1.93 ± 0.85a | 12.85 ± 7.76abc | 20.60 ± 10.64c | 3.77 ± 1.62ab |
Linear viscoelasticity limit | % | 3.72 ± 1.83abc | 1.79 ± 0.50bc | 5.76 ± 2.20a | 1.54 ± 0.75a | 1.34 ± 0.90a | 3.41 ± 1.47abc | 7.20 ± 2.23c | 1.88 ± 0.79ab |
Power law model | |||||||||
K | Pa s | 2.59 ± 3.99a | 1.39 ± 1.46a | 0.19 ± 0.09a | 2.62 ± 2.76a | 9.33 ± 3.66ab | 20.40 ± 13.57b | 5.42 ± 2.16a | 23.56 ± 12.54b |
n | 0.56 ± 0.16bc | 0.63 ± 0.19 cd | 0.86 ± 0.07d | 0.54 ± 0.13abc | 0.41 ± 0.06abc | 0.32 ± 0.14ab | 0.49 ± 0.09abc | 0.29 ± 0.08a | |
Herschel–Bulkley model | |||||||||
G0 | Pa | 3.63 ± 5.75a | 3.21 ± 4.08a | 0.06 ± 0.11a | 3.71 ± 5.61a | 10.79 ± 6.97ab | 31.17 ± 20.41bc | 7.94 ± 4.57a | 32.98 ± 16.12c |
K | Pa s | 1.07 ± 1.16abc | 0.46 ± 0.25ab | 0.19 ± 0.09a | 1.28 ± 0.9abc | 4.76 ± 0.65d | 3.07 ± 1.68 cd | 2.79 ± 0.95bcd | 5.08 ± 2.31d |
n | 0.63 ± 0.12ab | 0.73 ± 0.09bc | 0.87 ± 0.07c | 0.61 ± 0.1ab | 0.50 ± 0.03a | 0.59 ± 0.14ab | 0.58 ± 0.05ab | 0.48 ± 0.04a | |
Viscosity (at 10 s−1) | Pa s | 0.93 ± 0.89ab | 0.65 ± 0.55a | 0.14 ± 0.05a | 1.58 ± 1.17ab | 3.13 ± 0.87bc | 4.91 ± 2.08c | 2.13 ± 0.77ab | 5.19 ± 1.90c |
Intrinsic viscosity | mg L−1 | 158.33 | 148.53 | 151.56 | 123.29 | 293.37 | 242.31 | 160.28 | 147.51 |