Effect of High Voltage Electrostatic Field Combined with Modified Atmosphere Packaging and Controlled Freezing-Point Storage on the Quality of Tilapia Fillet

doi:10.7506/spkx1002-6630-201622043

Abstract

Abstract: This study examined the effectiveness of high voltage electrostatic field (HVEF) in combination with modified atmosphere packaging (MAP) and controlled freezing-point storage (CFPS) for the preservation of fresh tilapia fillet. Its quality changes in terms of sensory evaluation, fleshy exudation rate, microbial count, texture and muscle microstructure were compared under different storage conditions. Experimental results showed that the combined treatment resulted in higher scores for fillet color and odor than the ordinary CFOS treatment (control) and effectively inhibited the microbial activity in fillet, and the total number of bacterial colonies in the combined treatment group was reduced to about 104 CFU/g after 30 days of storage, indicating a larger reduction than of the control group. In addition, the drip loss rate was maintained at less than 5% in the combined treatment group, total volatile basic nitrogen (TVB-N) and K value (freshness index) also remained at a low level, and hardness decreased more slowly. Cell integrity and muscle fiber were observed by electron microscope, and it was revealed that the cellular structure was intact with close intercellular adhesions, which demonstrated that muscle protein degradation was slowed down. Moreover, the combined treatment could maintain the sensory quality of tilapia fillet and extend its shelf life to 30 days. This study indicates that the combination of HEVF, MAP and CFPS can maintain the quality of tilapia fillet and effectively extend its shelf life and therefore provides a feasible technical solution for domestic supermarket circulation of ice-stored tilapia fillet.

Key words: tilapia fillet, high voltage electrostatic field, modified atmosphere packaging and controlled freezing-point storage, microscopic observation

CLC Number:

TS254.4

CEN Jianwei, JIANG Aimin,*, LI Laihao, YANG Xianqing, DU Bing, HAO Shuxian, XIN Shaoping. Effect of High Voltage Electrostatic Field Combined with Modified Atmosphere Packaging and Controlled Freezing-Point Storage on the Quality of Tilapia Fillet[J]. FOOD SCIENCE, 2016, 37(22): 282-288.

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