Effect of Cold Atmospheric Plasma on Quality Maintenance of Penaeus vannamei during Cold Storage
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Abstract:
In this study, Penaeus vannamei was used as the raw material for investigating the effect of cold atmospheric plasma sterilization technology on its quality changes during cold storage. Cold atmospheric plasma technology is a comprehensive sterilization technology that has emerged in recent years, and widely used in fields such as food, medicine and environment. The effects of cold atmospheric plasma processes (20 kV, 40 kV or 60 kV voltage for 3 min) on the quality changes of the Penaeus vannamei during cold storage were investigated including indices like the total plate count, total volatile base nitrogen (TVB-N), pH, 2-thiobarbituric acid (TBA), texture properties, color difference, and sensory attibutes). Experiments showed that the treatments with three different voltages could effectively slow down the deterioration of Penaeus vannamei, and the 60-kV treatment exhibited the strongest effect with the total plate count after 14 days of cold storage being 5.21 log(CFU/g) (which was lower than that 6.21 log(CFU/g) of the control group), and the TVB-N also higher than that of the control group over a certain time period. With the refrigeration time prolonging, the retention of the texture properties and color of the treated groups was significantly greater than that for the control group. The treatment slowed down significantly the increase of pH and proliferation of microorganisms, but promoted significantly the increase of TBA value. In general, the cold atmospheric plasma had a significant bactericidal effect on Penaeus vannamei during cold storage, and facilitate its quality maintenance.
