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Differencing sea bass ( Dicentrarchus labrax ) fillets frozen in different conditions by impedance measurements
Author(s) -
Vidaček Sanja,
Janči Tibor,
Brdek Zdenka,
Udovičić Doris,
Marušić Nives,
Medić Helga,
Petrak Tomislav,
Lacković Igor
Publication year - 2012
Publication title -
international journal of food science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.831
H-Index - 96
eISSN - 1365-2621
pISSN - 0950-5423
DOI - 10.1111/j.1365-2621.2012.03031.x
Subject(s) - dicentrarchus , sea bass , electrical impedance , materials science , electrode , acoustics , fish <actinopterygii> , chemistry , fishery , biology , electrical engineering , physics , engineering
Summary The potential of electrical impedance was investigated to differentiate thawed sea bass fillets ( Dicentrarchus labrax ) previously subjected to different freezing conditions. The HP 4284A Precise LCR meter was used to measure impedance magnitude ( |Z| ) and phase ( ϕ ) at 27 frequencies from 0.1 to 1000 kHz. A needle‐type multi electrode array was tested as a probe for impedance measurements. The study showed that fast and non‐invasive control method based on measurement of ϕ on thawed fillets could assess the freezing conditions of white fish at higher frequencies of measurements (500–1000 kHz). The advantages of ϕ when compared with |Z| include its independence on temperature, on puncture depth of the probe and on duration of storage prior to freezing. Usage of a needle‐type multi electrode array reduced the effect of muscle tissue anisotropy; however, even at 1 MHz, the differences in electrical measurements varied around 10–11% depending on muscle fibre direction.