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Open AccessArticle

Utilizing Impedance for Quality Assessment of European Squid (Loligo Vulgaris) during Chilled Storage

1
Karlovac University of Applied Sciences, Trg J. J. Strossmayera 9, 47 000 Karlovac, Croatia
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University of Zagreb, Faculty of Electrical Engineering and Computing, Unska 3, 10 000 Zagreb, Croatia
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University of Zagreb, Faculty of Food Technology and Biotechnology, Pierottijeva 6, 10 000 Zagreb, Croatia
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Department of Food Technology and Bioprocess Engineering, Max Rubner-Institut, Federal Research Institute of Nutrition and Food, Haid-und-Neu-Straße 9, 76131 Karlsruhe, Germany
*
Authors to whom correspondence should be addressed.
Foods 2019, 8(12), 624; https://doi.org/10.3390/foods8120624
Received: 23 August 2019 / Revised: 17 October 2019 / Accepted: 25 November 2019 / Published: 29 November 2019
(This article belongs to the Special Issue Food Safety and Shelf-Life Extension of Food Products)
This study evaluates the quality of chilled squid Loligo vulgaris by non-destructive measurements of bioelectrical impedance from the first post-mortem day under controlled conditions. Squid samples were stored at 4.5 °C and 55% of relative humidity for 11 days. Impedance magnitude (|Z|) and phase (φ) at 200 frequencies (100Hz to 100MHz) were measured using an Agilent 4294A Precision Impedance Analyzer with needle-type multi-electrode array on days 1, 2, 3, 4, 5, 8, 9, 10, and 11 of storage. The changes in color, sensory properties, total volatile nitrogen, pH, and water holding capacity were also determined. The obtained results indicated that the samples could be classified into five to six distinctive groups by measuring the electrical parameters at frequencies close to 5MHz. In general, φ is less dependent on temperature and measurement setup than |Z|, while records at 5MHz correlate well with the days of storage (R2 = 0.968). The data imply that it is only possible to estimate the length of storage for the samples with measurements of phase angle, which can be useful for the development of new analytical instruments. Biosensors have a practical industrial application, as it is demonstrated that bioelectrical impedance data correlates well with the days of chilled storage. View Full-Text
Keywords: squid; Loligo vulgaris; bioelectrical impedance; chilled storage; storage days; quality squid; Loligo vulgaris; bioelectrical impedance; chilled storage; storage days; quality
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MDPI and ACS Style

Zavadlav, S.; Lacković, I.; Bursać Kovačević, D.; Greiner, R.; Putnik, P.; Vidaček Filipec, S. Utilizing Impedance for Quality Assessment of European Squid (Loligo Vulgaris) during Chilled Storage. Foods 2019, 8, 624.

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