Characterisation of Soluble Nitrogen and Muscle Proteins in Wastewater Throughout the Salting Process of Codfish (Gadus morhua)

• Type: Article in International Conference Proceedings Book
• Date: 2010

Authors

Ferraro, V (Author) Other; Cruz, IB (Author) Other; Jorge, RF (Author) Other; F. Xavier Malcata (Author) Other; Castro, PML (Author) Other; Pintado, ME (Author) Other

Conference proceedings International

Title: PRES 2010: 13TH INTERNATIONAL CONFERENCE ON PROCESS INTEGRATION, MODELLING AND OPTIMISATION FOR ENERGY SAVING AND POLLUTION REDUCTION

Pages: 829-834

13th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction

Prague, CZECH REPUBLIC, AUG 28-SEP 01, 2010

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Other information

Authenticus ID: P-003-CBW

DOI: 10.3303/cet1021139

Abstract (EN): In Portugal, Atlantic codfish (Gadus morhua) is usually consumed after dry salting; this process is carried out by mixing deboned codfish with food-grade marine salt followed by stacking in a tank for 6 days. Along the salting process, codfish incorporates salt as well as it is partially dried by the release of water - up to 22 % (w/w). Currently, this wastewater is treated as a residue not being further valorized. However, the presence of a significant amount of valuable compounds in this rest, such as amino acids and proteins, may allow for valorization opportunities not yet explored. The present work focuses on the identification of the nitrogen-containing compounds present in such wastewater. Total nitrogen (WSN), trichloroacetic acid-soluble nitrogen (TCASN) and phosphotungstic acid-soluble nitrogen (PTASN) were evaluated by the micro-Kjeldahl method; Biuret method was used for total protein determinations and SDS-Page was performed for protein molecular weight screening. The results revealed an increase of WSN, TCASN and PTASN with time, with corresponding values of 3.17 g/L (WSN), 1.62 g/L (TCASN) and 1.16 g/L (PTASN) by the end of the process; the evolution of WSN versus the released water was approximately constant during the salting process, as well as the ratios of TCASN/WSN and PTASN/WSN with values of 51.25 and 36.55 % (w/w) at equilibrium, respectively.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6