The aim of the investigation was to establish the functional properties of muscle protein isolates from Baltic cod (Gadus morhua) spine which were also compared with a commercially available pork protein preparation. The muscle proteins were extracted in mild condition with 0.1M NaOH solution at 4°C and subsequently were precipitated at pH 4.5. The amino acid composition of protein isolates is similar to fresh muscle protein. At the basic pH values, the obtained preparation is almost three times more soluble than the commercially available pork protein. Cod proteins were in 25 and 90% solubilized at pH 8 and 12, respectively. At these pH values, after an increase of the ionic strength of the solution to 0.35, the protein solubility decreased about 10 and 15%, respectively. Spinal proteins at a pH range of 6-12 have a 16-time higher foaming capacity than that for pork proteins. The obtained proteins also have a two-times lower oil holding capacity and almost 5.5-times lower water holding capacity in comparison with the commercial preparation. The preparation of muscle proteins from Baltic cod had an ability to hold 0.26 g oil or 0.94 g water per g of protein. Its quite good functional properties encourage continuing research on the deodorization method. After deodorization this protein preparation could find an application in the food industry.
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