Effect of Low Voltage Electrostatic Field(LVEF)Treatment on the Quality Changes of Trichiurus lepturus during Micro-frozen Storage

To study the influence of low voltage electrostatic field on the quality change of Trichiurus lepturus during its micro-frozen storage and preservation process,fresh Trichiurus lepturus of Zhoushan was used as experimental raw material and divided into groups after getting freezing point by freezing curve method in this article. Among them,the experimental group was treated by low-voltage electrostatic field(3000 V,50 Hz)under the temperature of four degrees below zero while the control group was not treated with electric field. During the experimental time,the pH value,TVB-N,TBA,TVC and K value of the two groups were measured.Combined with Hematoxylin＆Eosin,H＆E dying and SEM analysis,a comprehensive evaluation of the influence of LVEF and micro-frozen on the effect of the Trichiurus lepturus during the storage time were discussed. The results showed that the TVB-N value of the control group was 29.81 mg/100 g on the twenty-first day,which was near to inedible statues. On the twenty-eighth day,the TBA value was 1.78 mg MDA/100 g,the TVC value exceeded the corruption limitation,and the K value increased to 88.71%. The back muscle fibers were deformed and contracted,resulting in severe distortion and folding,and the Trichiurus lepturus body was severely corrupted;the TVB-N,TBA and TVC value of samples in the experimental groups were lower than the control groups on the twenty-eighth day,the pH value change was not obvious,the K value was 63.17%,the size of intercellular structure was uniform,only slight tissue damage existed,so it had a good preservation effect. Therefore,LVEF technology can effectively alleviate the quality deterioration of Trichiurus lepturus in micro-frozen storage process. Compared with control group,it can extend 7 days of micro-frozen Trichiurus lepturus on the shelf period.