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Viscosity test food1/11/2024 Plots comparing η a,50 values to LST flow distances revealed strong exponential relationships between the two measures (R 2=0.989 and R 2=0.987 for the 5- and 30-min setting times, respectively). The η a,50 values at the 30-min setting time were much higher than those at the 5-min setting time, indicating that the setting time before serving or consuming thickened juices can affect viscosity values. The η a,50 values of the juices increased as thickener concentration increased, whereas their flow distances decreased. The flow distance values measured by the line-spread test (LST) were compared with the apparent viscosity (η a,50) values measured with a sophisticated computer-controlled rheometer. The flow behaviors of three thickened fruit juices (orange, apple, and grape juice) prepared with a commercial instant xanthan gum (XG)-based thickener that is marketed in Korea were investigated at different thickener concentrations (1.0%, 1.5%, 2.0%, 2.5%, 3.0%, and 3.5%) and setting times (5 and 30 min) using a rheometer and a line-spread measurement method.
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