Three freshwater fishes: common carp, rainbow trout and northern pike were chosen for the evaluation of amino acid and fatty acid composition-fresh and after smoking. Smoking led to the increase in almost all amino acids, with the highest amount of EAA in common carp. This process led also to the enhancement in the level of SFA and the decrease in PUFA/SFA ratio in fishes. PI values were lower after this process for all fishes. HH ratio was also decreased (except for northern pike), while AI and TI were enhanced in all smoked samples.
Practical applicationsFish and fish products consumption (especially freshwater) is still insufficient despite their proven health-promoting properties. Because of the susceptibility of fish to perish, their preservation becomes a necessity. Smoking is one of the oldest food processing methods in the world. It imparts a characteristic color and flavor of the product. This process influences also on chemical composition of muscle protein and fat. Thus, the aim of this study was to investigate changes in amino acids composition and fatty acids profile in common carp, rainbow trout and northern pike, as a result of smoking. It is very important to increase consumer knowledge concerned on the species being the most suitable for traditional preservation method, taking into consideration the retaining of beneficial fish compounds.
| I N TR ODU C TI ONThe consumer of XXI century became more conscious that fish and fish products are important for human organism. When fish is regarded as a means for improving health, amino acid composition as well as fatty acid profile are primarily considered (Baki, Gӧnener, & Kaya, 2015).Fish is an important source of protein for a large part of the world's population (Mesías et al., 2015). About 80% of the fat-and Since fish is usually not consumed raw, various processing methods, such as boiling, roasting, frying, and smoking are employed to prepare it for the consumption. These methods could modify the proximate composition, fatty acids, amino acids and lead to the changes in nutritional value of fish (Aberoumand, 2014).Smoking deserves a special attention, being one of the oldest and Hryszko, 2014). However, the most common eaten fish were marine species, not freshwater ones. This small popularity of freshwater fishes could resulted, inter alia, from insufficient information for the consumers regarding the nutritional value of these foods. Meanwhile, the wide information could influence the decision of consumers about which fish to eat and how to prepare it . This is why, this study was performed to evaluate whether these three popular freshwater fishes-common carp, rainbow trout and northern pike could be recommended to the consumer in a form of smoked product. The aim was, therefore, to assess how smoking affect the beneficial freshwater fish meat components (amino acids, fatty acids).
| M A TE RI A L S A ND M E TH ODSA total 31.5 kg of fish that is common carp (Cyprinus carpio) (n5 6), rainbow trout (Oncorhynchus mykiss) (n5 6), and the no...