Cod nutritional composition
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Cod Nutritional Composition: Protein, Amino Acids, and Fatty Acids
High Protein Content in Cod
Cod is recognized for its high protein content, making it a valuable source of dietary protein. Dried salted Atlantic cod typically contains about 33.9 g of protein per 100 g of edible portion, while Pacific cod has slightly less at 33.1 g per 100 g. Cod sold in Nigerian markets also shows high protein levels, with values around 13.3% for cod stockfish, which is higher than some other fish species in the same markets. Cod by-products and fishmeal derived from cod also have substantial protein content, with fishmeal averaging about 61.9% protein by weight, reflecting the lean nature of cod tissue 2410.
Amino Acid Profile and Nutritional Quality
Cod provides a well-balanced amino acid profile, including all essential amino acids. Glutamic acid and aspartic acid are the most abundant, with glutamic acid ranging from 2.5–2.8 g/100 g in fresh and desalted cod, and even higher when measured as a proportion of protein in stockfish (about 14.7 g/100 g protein). Leucine and lysine are also present in significant amounts, while histidine tends to have the lowest score among the essential amino acids. The amino acid profile can vary slightly depending on the species (Atlantic vs. Pacific cod) and the geographical origin (Norway vs. Iceland), but both species are considered good sources of high-quality protein for human diets 124.
Effects of Processing on Nutritional Composition
Processing methods, such as salting, drying, and the use of polyphosphates, can influence the nutritional quality of cod. These processes may cause some loss of free amino acids, peptides, and proteins, particularly during brining and desalting. However, fresh and desalted cod generally retain a similar and balanced amino acid composition. The use of polyphosphates can also affect amino acid content in processed cod products .
Fatty Acid Composition
Cod contains a mix of saturated, monounsaturated, and polyunsaturated fatty acids. In stockfish, hexadecanoic acid (palmitic acid) is the most prominent in cod, while other species may have higher levels of omega-3 or oleic acid. Cod offal and by-products have a fatty acid composition similar to cod-liver oil, which is known for its beneficial omega-3 fatty acids 34.
Other Nutritional Components
Cod is low in fat, with offal containing about 4.7% total lipid and fishmeal about 8.9%. The ash content, reflecting mineral content, is also notable, especially in by-products and fishmeal (about 22.4%). Carbohydrate content in cod stockfish is relatively high, around 60.8%, but this may reflect the specific processing and measurement methods used in certain markets 3410.
Nutritional Value of Cod By-Products
By-products such as offal and bones are also nutritionally valuable. Cod offal contains significant protein and collagen, and hydrolysates from cod bone have high protein digestibility and a favorable amino acid score (PDCAAS of 0.95 for adults), making them suitable for functional foods and supplements 3710.
Conclusion
Cod is a nutrient-rich fish, offering high-quality protein with a well-balanced amino acid profile and beneficial fatty acids. While processing can affect some aspects of its nutritional composition, cod remains an excellent source of essential nutrients, both in its muscle and by-products, supporting its reputation as a healthy dietary choice 1234+2 MORE.
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