Rheaological behavior of high acyl gellan gum solution at gel point

Figures & data

Figure 1. Variation of G′ (solid symbol) and G″ (open symbol) with angular frequency ω for 1.0 wt% high acyl gellan at indicated temperature. The data were vertically shifted by a factor of 10^a with given a value to avoid overlapping.

Table 1. Sol–gel transition temperatures and critical exponent n of high acyl gellan solutions determined by different criteria.

c (wt%)	Tgel,C (°C)	Tgel,G’ (°C)	Tgel,ω (°C)	n	df
0.15	56.5	57.6	63.3	0.52	1.98
0.5	68.9	70.4	72.7	0.47	2.04
0.7	69.9	71.7	74.6	0.46	2.05
1.0	73.7	74.5	78.6	0.44	2.07
1.5	76.7	78.0	80.5	0.42	2.09

Figure 2. Temperature dependence of G′ (solid symbol) and G″ (open symbol) for the high acyl gellan solution at indicated concentration c. The data were vertically shifted by a factor of 10^a with given a value to avoid overlapping.

Figure 3. Tan δ versus the temperature of 1.0 wt% high acyl gellan gum. The gelling temperature T_gel,ω is estimated from the crossover of the frequency data.

Figure 4. Concentration dependence of sol–gel transition temperature of high acyl gellan solution.

Figure 5. Eldridge–Ferry plots ln c versus 1/T_gel,ω for high acyl gellan gum.