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Title: Non-invasive differentiation between fresh and frozen/thawed tuna fillets using near infrared spectroscopy (Vis-NIRS)
Authors: Reis, M. M.; Martinez, E.; Saitua, E.; Rodriguez, R.; Perez, I.; Olabarrieta, I.
Citation: LWT-FOOD SCIENCE AND TECHNOLOGY, 2017, 78, 129-137
Abstract: Fresh tuna is an expensive product sold on local and international markets. The use of ultra-low temperatures for frozen fish fillets is a practice found in the market in order to preserve fish quality for longer time. Fillets frozen bellow -60 degrees C do not show visual characteristics changes when thawed, being difficult to differentiate between fresh and frozen/thawed fillets. As fresh tuna is more expensive than thawed one, it is important to prevent that frozen/thawed products are sold as fresh in order to not to deceive the consumer. This study investigates the ability of Visible-Near InfraRed Spectroscopy (Vis-NIRS) to detect whether a sample of tuna is fresh or if it has been frozen/thawed. Fresh fillets were locally obtained, prepared in samples, scanned by Vis-NIRS and subsequently frozen. After five, twenty one and thirty five days the samples were thawed at 4 degrees C for 24 h and re-scanned. Partial Least Square Discriminant Analysis (PLS-DA) was applied using repeated double cross-validation showing that there is 92\% of probability that a fresh sample is predicted correctly as fresh and 82\% that frozen/thawed is really a frozen/thawed. This suggests that Vis-NIRS is able to detect the difference between fresh and frozen/thawed tuna samples. (C) 2016 Elsevier Ltd. All rights reserved.
Keywords: Near-infrared spectroscopy; Tuna; Fresh; Frozen/thawed; Fraud; FROZEN-THAWED FISH; MYOFIBRILLAR PROTEINS; MYOGLOBIN; AUTHENTICATION; STORAGE; SAMPLES
Issue Date: 2017
Type: Article
Language: English
DOI: 10.1016/j.lwt.2016.12.014
ISSN: 0023-6438
E-ISSN: 1096-1127
Funder: Royal Society of New Zealand within the New Zealand-EU International Research Staff Exchange Scheme (IRSES)/REPLAY [318920, FP7-PEOPLE-2012]
Department of Environment, Territorial Planning, Agriculture and Fisheries of the Basque Country Government
European Union [613688]
Appears in Publication types:Artículos científicos

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