For cryogenic freezing, it was found that all temperatures used did not affect the %freezing loss with the shrimps frozen at 70 C had the same cutting force as the fresh samples. Samples thawed under the microwave had slightly higher TBA value than those thawed at the refrigerator temperature. An increase in the freeze–thaw cycles resulted in an increase in TBA value and cutting force and a decrease in SSP value. The combined effect of thawing method and freeze–thaw cycle
of the shrimps frozen under both methods had the influence on %thawing loss. The microwave thawing gave the
samples with the higher %thawing loss than those thawed at refrigerator temperature in every cycle and the increase
in the freeze–thaw cycles gave the samples having the higher %thawing loss. The samples could be freeze–thawed
up to 2 cycles. Therefore, it is important to prevent temperature
fluctuations during transportation and storage to
avoid the freezing and thawing effect and to maintain the
quality of the frozen shrimps.