Vane Method to Evaluate the Yield Stress of Frozen Ice Cream

Abstract

Abstract The ability of ice cream to be dipped or scooped is a direct consequence of yield stress; however, yield stresses of frozen ice cream have not been quantified because of the lack of suitable testing equipment. This work presents the experimental equipment and methodology to solve this problem. A vane tester was designed, constructed, and then used to measure the yield stress of ice cream at typical scooping temperatures of –16 to –14°C. The moisture and fat contents of each brand varied significantly. Yield stresses ranged from 2.5 to 8.0 kPa. In general, the yield stress of chocolate was higher than the yield stress of vanilla ice cream. Also, yield stresses decreased as temperature increased. Yield stress and temperature were highly correlated in the higher fat ice cream; the lower fat brand did not show a strong correlation.