Influence of temperature and fish thickness on the mass transfer kinetics during the cod (Gadus morhua) desalting process

• Type: Article in International Scientific Journal
• Date: 2016

Authors

Oliveira, H (Author) Other; Goncalves, A (Author) Other; Nunes, ML (Author) Other; vaz-pires, p (Author) ICBAS; Costa, R (Author) Other

Journal

Title: Journal of the Science of Food and Agriculture

Vol. 96

Pages: 4457-4464

ISSN: 0022-5142

Publisher: Wiley-Blackwell

Indexing

ISI Web of Knowledge - 1 Citation

Scopus - 3 Citations

Other information

Authenticus ID: P-00K-RYA

DOI: 10.1002/jsfa.7657

Abstract (EN): BACKGROUND: The aim of this study was to analyse the influence of desalting temperature, fish thickness and desalting time on the mass transfer kinetics during the cod desalting process by physico-chemical analyses. RESULTS: Both water uptake and salt loss increased with increasing temperature (15 degrees C> 10 degrees C> 5 degrees C) up to 24h in 'thicker' pieces. The equilibrium achievement was faster in 'thinner' pieces and also with increasing temperature. Longer desalting times at 10 degrees C can be a good practice to be used during cod desalting at an industrial scale in order to obtain commercial products with higher yields. The faster mass transfer during desalting of 'thinner' pieces appears to followthree periods as a result of diffusion of the components (water, NaCl, and soluble proteins) because of the concentration differences, and pressure gradients due to expansion/shrinkage of the protein matrix, which is dependent on the NaCl content. The refractive index can be used by industry as an indirect measurement to determine the moment at which the 'thicker' samples are near the Z(NaCl) = Y-NaCl equilibrium. CONCLUSION: Optimum combinations between the process variables analysed are essential in order to speed up the mass transfer kinetics during cod desalting at an industrial scale. (C) 2016 Society of Chemical Industry

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8