The gelatin/gum arabic nanocapsules were obtained using a solution with total concentration of 0.5% (w/v) and biopolymer mixing ratio of 1:1. Jasmine essential oil was initially mixed with the same amount of surfactant, which was composed of 50% of Span 80 and 50% of Tween 80 (w:w), then added into the biopolymer solution with a core/biopolymer ratio of 1:1 (wt%). Subsequently, the whole solution was emulsified with a high-speed dispersing machine (FJ200-S, Shanghai Specimen Company) at the stirring rate of 10,000 rpm for 3 min. The mixture was held at room temperature under moderate stirring rate of w400 rpm at a desired pH for 30 min. Acetic acid (10%, v/v) was used for acidification. Next, TGase (0.25%, w/v) was added to harden the formed nanocapsules under a stirring rate of 400 rpm at a room temperature for 3 h and pH was adjusted with sodium hydroxide (10%, w/v) and acetic acid (10%, v/v).