Comparative Analysis of the Effects of Different Moisture Contents on the Quality of Self-heating Grilled Trichiurus haumela
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Abstract:
To solve the problem of declining quality of self-heating fish products after sterilization and reheating, this study used Trichiurus haumela as the raw material. And a colorimete, texture analyzer, scanning electron microscope (SEM) and Raman spectrometer were used to compare the color, texture and sensory quality of Trichiurus haumela after being grilled to different moisture contents (70%, 60%, 50% and 40%), sterilized and self-heated, to determine the optimal moisture content of self-heating grilled fish fillet. After the fish filets were grilled at 140 ℃, 160 ℃, 180 ℃ and 200 ℃ to the optimal moisture content, the color, texture, sensory score, microstructure and protein denaturation degree were compared. Then, the optimal grilling conditions of self-heating grilled fish filets were obtained. The results showed that with the decrease of moisture content, the value of L* and whiteness decreased from 64.65 and 60.74 to 42.23 and 35.82, respectively, and the values of a* and b* increased from -0.59 and 17.05 to 12.23 and 24.69, respectively. When the moisture content was 40%, the hardness, adhesiveness and chewiness of the samples were 4.27 times, 5.53 times and 5.89 times that with a moisture content of 70%. Sensory evaluation indicated that the fish fillet had the highest sensory scores for all the quality attributes when the sample was grilled to have a moisture content of 70%. The self-heating grilled fish fillets had a smaller muscle fiber diameter, tender flesh, stable protein structure and higher sensory quality when the fish was grilled 140 ℃ to make its water content reach 70% (that is, 140 ℃ for 24 min and 3 s). The muscle fiber diameter was finer, the meat was tenderer, and it had a stable protein structure and better sensory quality than other samples in this optimal condition. The results of this study could provide a theoretical basis for improving the quality of self-heating grilled fish products.
