Monitoring sodium chloride during cod fish desalting process by flow injection ...

• Author(s): Galvis-Sánchez, Andrea C. ; Tóth, Ildikó V. ; Portela, Ana ; Delgadillo, Ivonne ; Rangel, António O.S.S.
• Date: 2011
• Persistent ID: http://hdl.handle.net/10400.14/7447
• Origin: Veritati - Repositório Institucional da Universidade Católica Portuguesa
• Document Type: Article
• Language: English

Description

In order to adapt to the market trends that are moving towards ready-to-use products cod !sh industry is including into their industrial operations as the desalting step. The desalting process is a high cost and time demanding operation. The optimization of the desalting process is of vital importance for the !sh industry in order to assure the homogeneity and predictable concentration of sodium chloride in the !nal hydrated cod !sh product. On the other hand, consumers are more aware about the necessity to bring sodium consumption down to healthy levels to prevent cardiovascular diseases. The application of rapid and simple analytical methodologies that permit the control of the process and ensure food quality is essential in the food industries. This work reports the optimization and application of two analytical methodologies with the objective of monitoring the variation of sodium chloride concentration during cod desalting process. A "ow injection analysis system was developed based on the reaction between chloride and silver nitrate, and the formed precipitate was assessed spectrophotometrically as a turbidity change. A Fourier-mid infrared spectroscopy attenuated total re"ection method was also applied. Different chemical and physical parameters of the "ow injection system were studied and the analytical characteristics of both systems were compared.