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Quality changes during cod ( Gadus morhua ) desalting at different temperatures
Author(s) -
Oliveira Helena,
Gonçalves Amparo,
Nunes Maria L,
VazPires Paulo,
Costa Rui
Publication year - 2015
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.6995
Subject(s) - gadus , chemistry , food spoilage , food science , leaching (pedology) , cadaverine , shelf life , bacterial growth , nitrogen , brine , thiobarbituric acid , bacteria , biochemistry , fishery , environmental science , biology , fish <actinopterygii> , organic chemistry , antioxidant , genetics , lipid peroxidation , putrescine , soil water , soil science , enzyme
BACKGROUND To advise consumers and manufacturers regarding decreasing the time needed to desalt salted cod (a time‐consuming process), there is a need to develop knowledge about quality changes at different desalting temperatures. The objective of this work was to evaluate the physico‐chemical, microbiological and sensory quality changes and their causes during cod desalting at 5, 10 and 15 °C, using a cod/water ratio of 1:9 without water changes. The influence of slices with different thickness and different desalting times was also evaluated. RESULTS Desalting promoted a decrease in the levels of total volatile basic nitrogen, thiobarbituric acid reactive substances and free amino acids nitrogen ( FAA ‐N). The highest FAA ‐N values were found in ‘thicker’ samples desalted at 15 °C due to the higher proteolytic bacteria number observed in these samples, which activity compensated the leaching of soluble components to the desalting solution. The water uptake and the salt leaching out of the muscle found during the processes created conditions for the bacterial growth, contributing to the spoilage at 15 °C. Based on fresh odour and ‘off’‐flavours results, ‘thicker’ samples desalted at 15 °C after 72 h were close to spoilage and on microbial levels were spoiled. CONCLUSION In order to extend the shelf life and safety of cod desalted products, desalting at temperatures above 10 °C is not advisable. © 2014 Society of Chemical Industry