The results may indicate the difficult diffusion of
sodium bicarbonate containing traces of citric acid into the shrimp
meat of the shell-on samples. Conversely, the yield of the cooked
unpeeled samples frozen at the same conditions described above in
average at 94.70, 97.0, and 99.16 g/100 g fresh shrimp was much
higher than those of the peeled samples at 84.56, 86.5, and 91.81 g/
100 g fresh shrimp, respectively (Table 5). The shrimp shell could
play as a protection to the movement of the moisture during the
precooking and prevent the loss of the water from the samples
during the freezing.