In order to prevent the blackening and texture softening of heated shrimp, the pH was adjusted by soaking shrimps in acidic and alkali solutions, and their qualities were evaluated. The lightness of shrimps pretreated with 0.2% (w/w) citric acid and 0.05% (w/w) ascorbic acid solution increased by 20% compared to that of the control. The strength of mechanical hardness of shrimps soaked in acetic acid and phosphate solution (pH 6.0) was significantly higher (1209 gf) compared to that of untreated shrimp (801 gf; p<0.05), and the overall preference of texture was 0.4 points higher than that of the control in the descriptive sensory evaluation (p<0.05). In contrast, soaking in solution of pH 8 exhibited a weak texture hardening effect (855 gf). Additionally, the hardness of the heated shrimp after soaking at an adjusted pH of 4.0 increased to 4046 gf, but the yield based on weight decreased to 38% compared to that of untreated shrimp (70%; p<0.05).
- Organic acid
- Retorted shrimp