LIPID CHEMISTRY. LIPID OF BIOLOGICAL IMPORTANCE. Definition: Lipids are organic compounds , which have the following common properties: 1- They are esters of fatty acids or substances associated with them in nature.
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Lipids are organic compounds, which have the following common properties:
1- They are esters of fatty acids or substances associated with them in nature.
2- Most of them are insoluble in water but soluble in fat solvents (non polar solvents) e.g.: benzene, chloroform, acetone and ether.
Esters of fatty acids with various types of alcohols in addition to a prosthetic group
They are produced by hydrolysis of the first two groups
Esters of fatty acids with various types of alcohols
Esters of fatty acids with higher molecular weight monohydric alcohols.
Esters of three fatty acids with glycerol.= TAG
Phospholipids: Lipids containing, in addition to fatty acids and an alcohol, a phosphoric acid residue.
Glycolipids(glycosphingoLipids:) containing a fatty acid, sphingosine, and carbohydrate.
Proteolipids: fatty acid, alcohol and protein
1. Solubility in water:
fatty acids are insoluble in water but soluble in fat solvents.
2. Physical state at room temperature:
The saturated fatty acids are solid at room temperature
Unsaturated long chain fatty acids are liquids due to the presence of cis double bonds.
Mixture of carbohydrates
Glucose or Galactose
Male sex hormones
Female sex hormones