Evaluation of Fish Quality and Safety by Proteomics Techniques

19 pages, 1 table, 1 figureStock depletion, new trends in farming practices, the globalization of markets, and the development of novel products and production methods represent new challenges for seafood quality and safety. Fortunately, genomics, proteomics, and high-throughput microarray technologies have fundamentally changed our ability to study the molecular basis of aspects related to food authenticity, safety, and quality as well as changes induced by processing in food matrices. Furthermore, knowledge about the localization, structure, modification, function, and interactions of the proteins expressed by a genome from any tissue used as a source of food can offer precious information in order to improve its quality, safety, and nutritional properties. Although fish protein databases are still scarce, especially when compared with those available for edible plants and terrestrial animals, proteomics studies of model aquatic organisms are helping us to understand problems related to the quality and safety of seafood. The main objective of this chapter is to present a compilation of studies related to fish quality aspects by means of proteomics tools describing new perspectives and challenges for the use of proteomics-based biomarkers in the identification of the causes of quality flaws and their preventionN

Nutritional and additive uses of chitin and chitosan in the food industry

Chitin is the first polysaccharide identified by man. Chitin and its numerous oligomeric and monomeric, acetylated or deacetylated derivates have many physiological functions and applications. Chitin is found in the cuticles of arthropods and is a major constituent of cell walls from fungal, yeast and algae, from where chitin can be extracted chemically, enzymatically or by fermentation. The principal sources of chitin and chitosan are actually crustacean shells. Worldwide, more than 13.000.000 tons of crustaceans are caught from marine habitats each year, thus generating huge amounts of food waste. The unique biodegradability, biorenewability, biocompatibility, physiological inertness and hydrophilicity of chitin and chitosan make them of high interest for research and industry. In this chapter, we review the use of chitin, chitosan and their oligomers and monomers as food additives. In particular, their use in the regulation of lipid digestion and hypocholesterolemia, their functioning as an antigastritic agent and prebiotic is highlighted. Literature shows that oligomerization and the degree of deacetylation influences the development of chitin/chitosan-based nutraceuticals. The absence of chitinases and chitosanases in the human gut renders those biopolymers resistant to even partial degradation. For food applications, they are used as emulsifying, fining, thickening and stabilizing agents, antioxidants, and low calories food mimetics