Rheological behavior and textural characteristics resulting from the effect of different drying temperatures on the SFPG (soluble fraction of Persian gum)

Abstract

Soluble fraction of Persian gum (SFPG) solutions were extracted and dried by oven drying method at different temperatures including 45, 55, 65 and 75 °C. The effects of these drying different temperatures on the rheological and textural properties and color of soluble fraction of Persian gum were investigated in present study. The apparent viscosity of the dried gum solution at a shear rate of 75 s−1 was obtained in the range of 0.24 to 0.66 Pa.s. The apparent viscosity of the SFPG solution decreased from 0.19 to 0.15 Pa.s., as the hot air temperature increased from 45 to 75 °C. Herschel-Balkli model is well able to model the flow behavior of soluble fraction of Persian gum solution (SFPG) in experiments. The drying the soluble fraction of the Persian gum changed the textural properties of the gel prepared from the gum and the highest numerical value related to hardness, fracturability, cohesiveness and adhesiveness of the prepared gel texture was obtained as 0.0465 N, 0.0451 N, 9.977 and 0.1799 N.s, respectively. The color of 45 °C oven dried SFPG was darker than others.