Abstract:

Elastic modulus is the inherent basic characteristics of vermicelli. It is not only an important parameter indicating quality evaluation, but also one of the principal indexes deciding dry vermicelli texture. Three methods, three-point bending, compressive rod post-buckling and tensile method, were followed in the determination of dry vermicelli elastic modulus on TA-XT2i texture analyzer to establish the best methods for determining the elastic modulus of different shaped forms of dry vermicelli. Tensile method was found to be a method most suitable for the determination of various shaped forms of dry vermicelli among the three methods and give an elastic modulus of 1.419 × 10⁹ N/m² (9.57% moisture content). However, the best method for determining straight line-shaped vermicelli was compressive rod post-buckling, and its best test conditions were sample length of 100 mm and rotational angle of 20°. Moreover, a significantly linear negative correlation (R2 = 0.9510) between moisture content and elastic modulus was found in the present study, and the linear regression equation was as follows: E = (－ 0.1812ω + 3.237) × 10⁹.

Key words: dry vermicelli, elastic modulus, determination methods, moisture content, evaluation index