Modification of gelatin with OLA could improve surface activity
of obtained gelatin as indicated by the decrease in surface tension
and the increase in foaming and emulsifying properties. Gelatin
modified with OLA prepared at 70 ◦C for 9 h showed the highest
surface activity, especially at high molar ratio used. The increases
in hydrophobic region at surface of gelatin play a key role in enhancing
surface activity, foaming and emulsifying properties ofmodified
gelatin. Gelatin modified with OLA could yield the emulsion with
small oil droplet size and high stability toward different harsh environments
(pH, heat and salt), compared with the control gelatin.