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Rapid Evaluation Methods for Quality of Trout (Oncorhynchus mykiss) Fresh Fillet Preserved in an Active Edible Coating

1
Institute of Food Sciences—National Research Council (CNR), Via Roma 64, 83100 Avellino, Italy
2
Department of Sciences and Technologies, University of Sannio, Via Port’Arsa, 11, 82100 Benevento, Italy
*
Author to whom correspondence should be addressed.
Foods 2019, 8(4), 113; https://doi.org/10.3390/foods8040113
Received: 25 February 2019 / Revised: 24 March 2019 / Accepted: 29 March 2019 / Published: 1 April 2019
(This article belongs to the Section Food Quality and Safety)
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Abstract

In this study different methods were used to evaluate the effectiveness of a carrageenan coating and carrageenan coating incorporating lemon essential oil (ELO) in preserving the physicochemical and olfactory characteristics of trout fillets stored at 4 °C up to 12 days. The fillet morphological structure was analyzed by histological and immunological methods; lipid peroxidation was performed with the peroxide and thiobarbituric acid reactive substances (TBARS) tests. At the same time, two less time-consuming methods, such as Attenuated Total Reflectance-Fourier Transformed Infrared (ATR-FTIR) spectroscopy and the electronic nose, were used. Uncoated trout fillets (UTF) showed a less compact tissue structure than carrageenan-coated threads (CTF) and coated fillets of carrageenan (active) ELO (ACTF), probably due to the degradation of collagen, as indicated by optical microscopy and ATR-FTIR. UTF showed greater lipid oxidation compared to CTF and ACTF, as indicated by the peroxide and TBARS tests and ATR-FTIR spectroscopy. The carrageenan coating containing ELO preserved the olfactory characteristics of the trout fillets better than the carrageenan coating alone, as indicated by the electronic nose analysis. This study confirms that both carrageenan and ELO containing carrageenan coatings slow down the decay of the physicochemical and olfactory characteristics of fresh trout fillets stored at 4 °C, although the latter is more effective. View Full-Text
Keywords: trout fillets; active carrageenan coating; oxidation stability; muscle structure; electronic nose; ATR-FTIR trout fillets; active carrageenan coating; oxidation stability; muscle structure; electronic nose; ATR-FTIR
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Volpe, M.G.; Coccia, E.; Siano, F.; Di Stasio, M.; Paolucci, M. Rapid Evaluation Methods for Quality of Trout (Oncorhynchus mykiss) Fresh Fillet Preserved in an Active Edible Coating. Foods 2019, 8, 113.

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