Thermal properties of surimi analyzed using DSC

Thermal properties of surimi made from Alaska pollock (Theragra chalcogramma) were analyzed using differential scanning calorimetry (DSC) in the freezing range. Each dynamically correlated thermogram was used to determine initial freezing point, unfreezing water (bound water), apparent specific heat, enthalpy and unfrozen water weight fraction. When water content was controlled at 80.3% (wet basis) the cryoprotectant concentration had little effect on thermal properties in the unfrozen and fully frozen (-40 degrees C) ranges. However, the initial freezing point and thermal properties just below this point were significantly affected. The study also demonstrated the great potential of DSC for measuring and modeling frozen food thermal properties