Gelatinization kinetic of waxy starches under pressure according to ionic strength

Abstract

High pressure is a potential technology for the texturization of food products at ambient temperature. In this area, waxy starches are particularly interesting because they gelatinize quickly under sufficient pressure. However, gelatinization may be influenced by other components in the food matrix. Here, we investigate the influence of increasing ionic strength on gelatinization rate and kinetics at 500 MPa for waxy corn and waxy rice starches. We show that increasing ionic strength strongly retards and inhibits starch gelatinization under pressure and leads to heterogeneous gels with remnant granules.

Keywords:

• waxy starch
• high hydrostatic pressure
• gelatinization kinetics
• high-pressure microscopic cell
• rheology
• ionic strength