Thursday, December 29, 2016

Lipids

Lipids are molecules that contain hydrocarbons and make up the building blocks of the structure and function of living cells. Examples of lipids include fats, oils, waxes, certain vitamins, hormones and most of the non-protein membrane of cells.

Chemically lipids are defined as esters of glycerol and fatty acids or as the triglycerides of fatty acids,
General formula of lipid = Glycerol + Fatty acid = Triglycerides.

Glycerol:has 3 carbon molecules with 8 hydrogen and 3 oxygen molecules. that means it has 3 OH groups , water soluble alcohol . it is form from simple carbohydrates. it is one of the component in  glycolysis (glyceraldehyde).

Fatty acid consists of a aliphatic chain of an even number of carbon atoms with hydrogen atoms and at one end of the chain and a carboxyl group (−COOH). Fatty acids are not found in a free state in nature; commonly they exist in combination with glycerol, in the form of triglyceride. If the carbon-to-carbon bonds are all single, the acid is saturated; if any of the bonds is double or triple, the acid is unsaturated,unsaturated fatty acids are more reactive. A few fatty acids have branched chains; others contain ring structures eg:prostaglandins.
Glycerol condense  with fatty acids to produces lipids or triglycerides and 3 molecules of water.