What is lecithin function in egg yolk?
A functional lipid found in egg yolk, also known as phospholipid, because its structure contains phosphorus. Used in food products, cosmetics and pharmaceuticals as a natural emulsifier.
What molecules are found in the egg yolk lecithin?
Egg yolk lecithin (EYL) is mainly composed of phosphatidylcholine (PC) and phosphatidylethanolamine (PE), which are 60~73% and 15~26% of total PLs, respectively [1]. Lyso-phosphatidylcholine (LPC), sphingomyelin (SM), and phosphatidylinositol (PI) are also found in EYL as minor components [2].
How do you make egg yolk with lecithin?
A process for obtaining yolk lecithin from a raw egg yolk which comprises subjecting a raw egg yolk to extraction with liquid dimethyl ether to obtain an extract and dehydrating the extract to an extent that the water content is not more than 20% by weight, whereby a lecithin-rich fraction is obtained as a separate …
How do you separate cholesterol from egg yolk?
A simple procedure for the isolation of the cholesterol, by hydrolysis and extraction followed by column chromatography, is described. The cholesterol can be further purified by complexation with oxalic acid. It can also be oxidized and conjugated to cholestenone.
What is the role of lecithin?
The body uses lecithin in the metabolic process and to move fats. Lecithins turn into choline in the body. They help make the neurotransmitter acetylcholine. Lecithin is commonly used as a food additive to emulsify foods.
What is meant by lecithin?
noun. Biochemistry. any of a group of phospholipids, occurring in animal and plant tissues and egg yolk, composed of units of choline, phosphoric acid, fatty acids, and glycerol. a commercial form of this substance, obtained chiefly from soybeans, corn, and egg yolk, used in foods, cosmetics, and inks.
What is structure of lecithin?
Lecithins are composed of phosphoric acid, cholines, esters of glycerol, and two fatty acids; the chain length, position, and degree of unsaturation of these fatty acids vary, and this variation results in different lecithins with different biological functions.
What is lecithin explain its function?
Lecithin is a phospholipid, a yellow-brown fatty substance that consists of glycerol, two fatty acids, a phosphate group, and choline. In contrast to fats, which function as fuel molecules, lecithin serves a structural role in cell membranes. It is found in all cells.
Can I use egg yolk for lecithin?
Egg yolk lecithin possesses this same property. Studies have shown that egg yolk lecithin can be as effective as an emulsifier as soy and, in some environments, even more stable. Egg yolk has also been shown to stave off rancidity better than soy lecithin.
Is egg yolk pure cholesterol?
One large egg has about 186 mg of cholesterol — all of which is found in the yolk. If you like eggs but don’t want the cholesterol, use only the egg whites. Egg whites contain no cholesterol but still contain protein. You may also use cholesterol-free egg substitutes, which are made with egg whites.
What are the types of lipids present in egg yolk based on polarity?
The abundant lipids of hen egg yolk are triacylglycerol (64–67%), phospholipids (22–28%) and cholesterol (3–6%) (Palacios & Wang 2005; Schreiner et al. 2006 ).
What is lecithin in biology?