พิรพร อินทร์สำเภา. Regulation ofThermal and Mechanical Properties of Egg Albumen-Cassava Starch Composite Structure through Manipulation of Starch Granular State. Master's Degree(Food Engineering). King Mongkut's University of Technology Thonburi. KMUTT Library.. : King Mongkut's University of Technology Thonburi, 2552-11-12.
Regulation ofThermal and Mechanical Properties of Egg Albumen-Cassava Starch Composite Structure through Manipulation of Starch Granular State
Abstract:
Due to the long paste gel property as well as the mechanical synergistic property of
protein-starch interaction, this research was conducted to study the effects of
gelatinization transition states (native, onset, peak and endset) of cassava starch (CS) on
the mechanical properties of egg albumen (EA) film containing CS formed by saltinduced
gelation method. Glycerol was added as film plasticizer during natural drying
at atmospheric condition (RH = 75?5 %, temperature = 30? 1 DC). The weight ratio of
protein:CS:glycerol was 1:0.2:0.1. Tensile properties of the composite films aged at
different conditions (ambient: RH = 75%, temperature = 30?1 DC; high RH and high
temperature: RH = 100%, temperature = 150? 1 DC) were investigated using a texture
analyzer. For films aged at the ambient condition, the results indicated that tensile
strength (TS) and elongation at break of the composite films increased as the transition
state of the filled starch changed from native to peak states. However, TS and
elongation at break decreased as the transition state of starch changed to endset state.
All of the composite films aged at high RH and high temperature revealed the same
trend to that of the films aged at ambient condition. Nevertheless, the tensile strength
and elongation at break of the composite films aged at high temperature and high RH
were lower than those of films aged at ambient condition. This study indicated that the
tensile property of protein matrix could be improved by tilling starch and the properties
could be architected by altering the transition state of the filling starch.