4.7 Article

Effects of adjustable parallel high voltage electrostatic field on the freshness of tilapia (Orechromis niloticus) during refrigeration

Journal

LWT-FOOD SCIENCE AND TECHNOLOGY
Volume 66, Issue -, Pages 151-157

Publisher

ELSEVIER SCIENCE BV
DOI: 10.1016/j.lwt.2015.10.019

Keywords

Adjustable parallel high voltage electrostatic field (AP-HVEF); Tilapia meat; Preserving freshness; Fish freshness indicators

Funding

  1. National Science Council, Republic of China [103-2221-E-212-012, 104-2221-E-212-010-MY2]

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Our preliminary findings indicated that at 4 degrees C, a High Voltage Electrostatic Field (HVEF) of 100 kV/m can effectively extend the shelf life of fish for up to 2 days. This study further investigated changes in the freshness of tilapia meat after using various HVEF treatments: 300, 600, or 900 kV/m. Both the VBN and K-values of the untreated tilapia meat increased during the storage period, eventually exceeding the hygienic standard on the 6th day, with values of 60% and 25 mg/100 g, respectively. However, in fish treated with 600 kV/m HVEF, the K value approached 60% around the 8th day; fish treated with 300 kV/m HVEF had a VBN of only 20.47 mg/100 g. This demonstrated the effectiveness of HVEF in preserving freshness. In untreated fish, the total plate counts (TPC) reached 4.02 x 10(5) CFU/g meat by the 8th day, while fish treated with an HVEF of 900 kV/m still had not exceeded the sanitary standard in that same time period (3.45 x 10(5) CFU/g meat). In summary, an HVEF with 600 kV/m electric field strength or more can enhance food preservation, as it effectively delays ATP degradation, protein denaturation, lipid oxidation, and microbiological growth. (C) 2015 Elsevier Ltd. All rights reserved.

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