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As the most phosphorylated natural protein, phosvitin contains 123 phosphoserine residues accounting for 56.7% of its total 217 amino acid residues. [3] [8] The structure of phosvitin at large consists of 4-12 base pair stretches of serines, interspersed with amino acid residues lysine (6.9%), histidine (6.0%), and arginine (5.1%), among others in smaller quantities. [9]
All of the fat-soluble vitamins (A, D, E and K) are found in the egg yolk. Egg yolk is one of the few foods naturally containing vitamin D. The composition (by weight) of the most prevalent fatty acids in egg yolk typically is: [9] Unsaturated fatty acids: Oleic acid, 47%; Linoleic acid, 16%; Palmitoleic acid, 5%; Linolenic acid, 2%; Saturated ...
Common sources include egg yolk, [7] marine foods, soybeans, [7] milk, rapeseed, cottonseed, and sunflower oil. It has low solubility in water, but is an excellent emulsifier. In aqueous solution, its phospholipids can form either liposomes, bilayer sheets, micelles, or lamellar structures, depending on hydration and temperature.
Eggs play a big role in many people's protein intake, but you might wonder exactly how much is it packing. Ahead, experts break down all the benefits of the food.
Egg lecithin was first isolated in 1846 by the French chemist and pharmacist Theodore Gobley. [1] Gobley originally isolated lecithin from egg yolk—λέκιθος (lekithos) is 'egg yolk' in ancient Greek—and established the complete chemical formula of phosphatidylcholine in 1874.
The name lecithin was derived from Greek λέκιθος, lekithos 'egg yolk' by Theodore Nicolas Gobley, a French chemist and pharmacist of the mid-19th century, who applied it to the egg yolk phosphatidylcholine that he identified in 1847. Gobley eventually completely described his lecithin from chemical structural point of view, in 1874.
Vitellogenin provides the major egg yolk protein that is a source of nutrients during early development of egg-laying vertebrates and invertebrates.Although vitellogenin also carries some lipid for deposition in the yolk, the primary mechanism for deposition of yolk lipid is instead via VLDLs, at least in birds and reptiles. [4]
A raw egg yolk surrounded by the egg white. Avidin was first isolated from raw chicken egg white by Esmond Emerson Snell. Avidin was discovered by Esmond Emerson Snell (1914–2003). This discovery began with the observation that chicks on a diet of raw egg white were deficient in biotin, despite availability of the vitamin in their diet. [8]