Development and Application of Phase Change Coolant for Pleurotus eryngii Based on Its Freezing Point
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Abstract:
Based on the aqueous solution of maltitol and potassium sulfate, nano titanium dioxide and superabsorbent polymer are added to develop a phase change coolant. The onset temperature and phase enthalpy change of the coolant were measured by the DSC method, and then its properties were also measured by a T-t curve and repeated freezing and thawing tests. Results show the best formulation of the developed coolant is: maltitol 1,72%, potassium sulfate 2.09%, nanometer titanium dioxide 0.01%, superabsorbent polymer 0.50%. Its onset temperature is -1.64 ℃, the phase enthalpy change is 295.14 J/g. In addition, the phase change coolant is not overcooled and has no phase separation. The phase change coolant was applied to the storage of Pleurotus eryngii to test its preservation effect. During the storage, the temperature of the foam box was recorded, and the sensory score, weight loss rate, color, hardness, springiness of Pleurotus eryngii were measured every day. The result shows the coolant has good effect on the application of Pleurotus eryngii’s preservation, which can significantly reduce the physiological and biochemical reactions of Pleurotus eryngii, and delay its quality deterioration, and the best mass ratio is 1:4.
