2.2. Methods
2.2.1. Sarcoplasmic protein (SP) preparation
Frozen fish fillets were allowed to thaw in the cold room overnight before homogenizing with 3 volumes of de-ionizedwater (DIwater) in a blender for 2 min. The homogenate was centrifuged at 1000 g for 15 min before supernatant collection.
This process was repeated once more.
The collected supernatant (SP solution) was used to determine for its patterns using sodium dodecyl sulfate gel electrophoresis (SDS-PAGE) and the left solutionwas kept overnight in the freezer (70 C) before lyophilizing using a freeze-dryer (IlShin Lab. Gyeonggi-do, South Korea).
The obtained powder was used as SP powder sample.
The protein content in the SP powder was estimated by Kjeldahl method according to AOAC (2000) procedure.
The protein content was about 74.4 0.22 g/100 g sample.
The same batch of SP preparation was used throughout the experiment.