Krill nutritional composition
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Krill Nutritional Composition: Protein, Lipids, and Moisture
Krill are recognized for their high nutritional value, particularly as a source of protein and beneficial lipids. Moisture content in krill is typically high, ranging from about 71% to 83% in raw samples, with dry matter containing significant amounts of protein (49–74%) and lipids (4.5–25%) depending on the processing method and species studied 128. Krill protein is of high quality, rich in essential amino acids such as lysine, arginine, tryptophan, and threonine, and its protein efficiency ratio is comparable to that of casein, a standard reference protein .
Lipid Profile: Omega-3 Fatty Acids and Phospholipids
Krill lipids are notable for their high content of omega-3 polyunsaturated fatty acids (PUFAs), especially eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), which are present in both whole krill and krill oil supplements 2345+4 MORE. The lipid fraction is composed of 39–81% phospholipids, which are associated with the high bioavailability of EPA and DHA in krill oil 469. Fatty acid analysis shows that saturated fatty acids (such as palmitic acid), monounsaturated fatty acids (such as palmitoleic acid), and polyunsaturated fatty acids (notably EPA and DHA) are all present, with PUFAs making up 23–53% of total fatty acids 1235.
Mineral and Trace Element Content
Krill are also a good source of minerals, including sodium, magnesium, potassium, calcium, iron, and zinc. The mineral content varies by species and processing method, but typical values for dried krill include sodium (361–484 mg/100g), magnesium (522–684 mg/100g), potassium (91–165 mg/100g), and calcium (504–776 mg/100g). Iron and zinc are present as major trace elements, and fluoride levels are generally lower than previously reported .
Other Nutritional Components: Chitin, Ash, and Bioactives
Krill contain chitin (2.5–6% of dry matter), which is a structural carbohydrate, and ash content ranges from about 3% in raw krill to 40% in some dried products, reflecting mineral richness 128. Krill oil and whole krill also provide bioactive compounds such as astaxanthin (a potent antioxidant), sterols, tocopherols (vitamin E), vitamin A, and flavonoids, which contribute to their health-promoting properties 4678.
Nutritional Value and Health Implications
Krill’s high-quality protein, rich omega-3 content, and abundance of antioxidants and minerals make it a valuable food source with potential health benefits. These include anti-inflammatory effects, cardiovascular protection, neuroprotection, and possible anticancer activities, as supported by both preclinical and clinical studies on krill oil 4679. The nutritional profile of krill is considered superior to many other marine protein sources, especially due to its low fat content and high antioxidant levels 78.
Conclusion
Krill are a nutrient-dense marine resource, offering high-quality protein, beneficial omega-3 fatty acids (EPA and DHA), essential minerals, and unique bioactive compounds. Their nutritional composition supports their growing use in human food and dietary supplements, with ongoing research highlighting their potential health benefits and applications in nutrition and health 1234+6 MORE.
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