Bite-speed effects in Two-bite texture analysis

Abstract

To investigate the effects of bite speed on the basic parameters in texture profile analysis(TPA),three different samples were measured using four commercial instruments. The 2-bite TPA tests, where the plunger changes direction twice, downward and upward to a food sample, were conducted at test speeds of 10mm/s and 1 mm/s, and values of maximum stress, tensile work and second-to-first bite work ratio were compared among the instruments. Significant differences among the four instruments were found in the textural parameters measured at 10mm/s but not at 1 mm/s. Under the 10mm/s condition, two of the instruments could not correctly change the movement direction at a set compression distance. Another instrument needed a significantly long acceleration period, which influenced the work values. Some instruments detected noise due to inertia that significantly affected the textural parameters. These data obtained from different commercial instruments at 10mm/s indicated it is difficult to interchange these instruments with each other.