Rheological Properties of Soybean β-Conglycinin in Aqueous Dispersions: Effects of Concentration, Ionic Strength and Thermal Treatment

Figures & data

Figure 1 SDS-PAGE profiles of β-conglycinin. Lane 1: in the absence of β-mercaptoethanol (2-ME); and Lane 2: in the presence of 2-ME.

Figure 2 DSC profiles of β-conglycinin (20% w/v) in 50 mM phosphate buffer (pH 7). A: without NaCl; B: with 0.5M NaCl.

Figure 3 Steady shear viscosity of β-conglycinin in aqueous dispersions (20°C), as a function of shear rate. Diamonds represent 3%, circles 5%, squares 7% and triangles 10% concentration of β-conglycinin. The filled represents down curve, while the empty up curve.

Figure 4 Frequency dependence of β-conglycinin in aqueous dispersions (20°C, strain = 0.1). Diamonds represent 3%, circles 5%, squares 7% and triangles 10% concentration of β-conglycinin. The filled represents G′, while the empty G′′.

Figure 5 Steady shear viscosity (empty) and dynamic viscosity (filled) of β-conglycinin in aqueous dispersions at 20°C (from down to up). Circles represent 5%, squares 7% and triangles 10% concentration of β-conglycinin. Due to very low modulus, 3% concentration was not tested.

Figure 6 Steady shear viscosity of β-conglycinin (10% w/v) in aqueous dispersions at 20°C, as a function of shear rate. Triangles represent without NaCl, squares 0.125M, circles 0.25M and diamonds 0.5M concentration of NaCl. The filled represents down curve, while the empty up curve.

Table 1 Rheological parameters of the Carreau model

Sample	Parameters	(s^−1)	R
0.125M	ηo = 81.02; λ = 5.046; n = 0.2047	0.001–1100	0.9975
0.25M	ηo = 1.847; λ = 0.2207; n = 0.5246	0.02–1100	0.9727
0.5M	ηo = 0.349; λ = 240.6; n = 0.8174	0.3–1100	0.9601
M: molar concentration of NaCl; ηo: Pas; and λ: (s), n (–).

Figure 7 Frequency dependence of β-conglycinin (10% w/v) in aqueous dispersions (20°C, strain = 0.1). Triangles represent without NaCl, squares 0.125M, circles 0.25M and diamonds 0.5M concentration of NaCl. The filled represents G′, while the empty G′′.

Figure 8 Thermal gelation profiles of β-conglycinin (10% w/v) in aqueous dispersions. Triangles represent without NaCl, diamonds with 0.5M NaCl. The filled represents G′, while the empty G′′.

Figure 9 Strain dependence of β-conglycinin (10% w/v) in aqueous dispersions by shear stress ‘τ’ (crossover) sweep measurements (20°C, f = 0.628 rad·s⁻¹) before heating. The filled represents first run, while the empty second run.

Figure 10 Strain dependence of β-conglycinin (10% w/v) in aqueous dispersions by shear stress ‘τ’ (crossover) sweep measurements (20°C, f = 0.628 rad·s⁻¹) after heating (20°C → 80°C-holding for 30 min-80°C → 20°C).