Soy protein hydrolysis and polysaccharides interactions: differencial performance on kinetic adsorption at air-water interface

MARTÍNEZ, KARINA DAFNE; CARRERA SANCHEZ, CECILIO

Biointerface Research in Applied Chemistry

Biointerface Research in Applied Chemistry

Año: 2016

2069-5837

Theobjective of the work was to study the impact of soy protein hydrolysis onkinetic adsorption to the air-water interface and the effect of polysaccharidesaddition. Was used soy protein (SP) and theirshydrolysates of 2% (H1) and 5.4% (H2) degree of hydrolysis. The polysaccharides(PS) used were a surface active one called E4M and a non-surface active one,lamda carrageenan (lC). The dynamic surfacepressure of interfacial films was evaluated with a drop tensiometer. In thiscontribution, we have determined the kinetic parameters of adsorption to theair-water interface which determined the penetration (Kp) and rearrangement (Kr)rates of SP, H1, H2 and PS, as well as their mixed systems.Itwas observed an increase of Kp and Kr when the protein were hydrolyzed (from SPto H1), however, when degree of hydrolysis progresses to H2 the parametersdecreased again. In other hand, considerable differences werenot found between these two PS studied concerning the Kp to air-water interfaceat these conditions. In spite of the different surface active nature of the PS,the proteins seem to control the behavior of the protein-PS interactions.However, when Kr of mixed systems was analyzed, the degree of hydrolysis and PSnature started to have a huge importance. Hence, it could be observed synergicor antagonic effects on Kr of biopolymers at liquid interface depending to thedegree of hydrolysis of protein analyzed and the type of PS selected.