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Egg white consists primarily of about 90% water into which about 10% proteins (including albumins, mucoproteins, and globulins) are dissolved. Unlike the yolk, which is high in lipids (fats), egg white contains almost no fat, and carbohydrate content is less than 1%. Egg whites contain about 56% of the protein in the egg.
Ovalbumin (abbreviated OVA [1]) is the main protein found in egg white, making up approximately 55% of the total protein. [2] Ovalbumin displays sequence and three-dimensional homology to the serpin superfamily, but unlike most serpins it is not a serine protease inhibitor. [3]
Albumin is a family of globular proteins, the most common of which are the serum albumins. All of the proteins of the albumin family are water- soluble , moderately soluble in concentrated salt solutions, and experience heat denaturation .
(Top) The protein albumin in the egg white undergoes denaturation and loss of solubility when the egg is cooked. (Bottom) Paperclips provide a visual analogy to help with the conceptualization of the denaturation process. When food is cooked, some of its proteins become denatured. This is why boiled eggs become hard and cooked meat becomes firm.
The surrounding egg white floats perfectly around the yolk, membrane intact. One of the divers was even able to make the egg 'dance' around by manipulating the current of the water around it.
The albumin in egg white (ovalbumin) is an unrelated protein to the serum albumin that is found in the blood-stream. Consumption of egg white will not have any direct effect on the levels of serum albumin (though it will provide a source of amino acids - following digestion - which can be used to synthesise serum albumin).
Ovotransferrin (conalbumin) is a glycoprotein of egg white albumen. [1] Egg white albumen is composed of multiple proteins, of which ovotransferrin is the most heat reliable. It has a molecular weight of 76,000 daltons and contains about 700 amino acids. Ovotransferrin makes up approximately 13% of egg albumen (in contrast to ovalbumin, which ...
The Haugh unit is a measure of egg protein quality based on the height of its egg white (albumen). [1] The test was introduced by Raymond Haugh in 1937 [1] and is an important industry measure of egg quality next to other measures such as shell thickness and strength.