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(a–e) The effect of ion intensity on the viscosity of different formulations ((a) 0.4% gellan gum; (b) 0.45% gellan gum; (c) 0.45% gellan gum and 0.1% HPMC; (d) 0.45% gellan gum and 0.2% HPMC; (e) 0.5% gellan gum). (f) The value of viscosity change of the formulations STF = 40:28 (34 °C, 10 rpm, n = 4).
