Postmortem changes in physiochemical and sensory properties of red snow crab (Chionoecetes japonicus) leg muscle during freeze storage

• Main Authors: Joon-Young Jun, Min-Jeong Jung, Dong-Soo Kim, In-Hak Jeong, Byoung-Mok Kim
• Format: Article
• Language: English
• Published: The Korean Society of Fisheries and Aquatic Science 2017-07-01
• Series: Fisheries and Aquatic Sciences
• Subjects: Red snow crab; Chionoecetes japonicus; Postmortem change; Leg muscle; Non-thermal muscle separation
• Online Access: http://link.springer.com/article/10.1186/s41240-017-0057-9

Abstract In order to evaluate the maximal storable period of the raw crab for a non-thermal muscle separation, the quality changes of the leg meat of red snow crab (Chionoecetes japonicus) during freeze storage were investigated. Fresh red snow crabs were stored at −20 °C for 7 weeks, and the leg muscle was separated by a no heating separation (NHS) method every week. During the storage, considerable loss of the leg muscle did not occur and microbiological risk was very low. In contrast, discoloration appeared at 2-week storage on around carapace and the leg muscle turned yellow at storage 3-week. In physiochemical parameters, protein and free amino acids gradually decreased with storage time, expected that proteolytic enzymes still activated at −20 °C. At 4-week storage, the sensory acceptance dropped down below point 4 as low as inedible and notable inflection points in pH and acidity were observed. The volatile base nitrogen was low, though a little increase was recorded. These results suggested that the maximal storable period at −20 °C of the raw material was within 2 weeks and it was depended on external factor such as the discoloration. The present study might be referred as basic data for approaches to solve quality loss occurred in non-thermal muscle separation.