Young’s Modulus and Poisson’s Ratio Changes in Japanese Radish and Carrot Root Tissues during Boiling

Abstract

Young’s modulus and Poisson’s ratio changes in Japanese radish and carrot during boiling were examined. Young’s modulus decreased rapidly within 2 min, then the decrease moderated. Carrot (3.0 to 0.5 MPa) exhibited increased modulus values relative to radish (1.8 to 0.3 MPa) during the same boiling period. Poisson’s ratio decreased slightly during boiling; carrot Poisson’s ratio (0.40 to 0.33) was smaller than radish (0.35 to 0.23) during the same boiling period. Boiling in saline solutions increased moduli reductions under the same treatment conditions. These results indicated that carrot maintained hardness, but reduced volume relative to radish during boiling.