These are organic compounds consisting of carbon oxygen and hydrogen. Here oxygen is found in a smaller ratio compare to that of carbohydrates.
Lipids are insoluble in water but dissolve in organic solvents such as; alcohol ether benzene. Lipids include naturally fats and oils. Fats are solid at room temperature and pressure while oils are liquids
Naturally fats and oils are compounds or esther of fatty acid and glycerol. Elycerol has a general formular C3H8O3 exist structural as;
On like fatty acids which vary from one lipids to another glycerol remains thesame in all lipid.
There are two types of fatty acids: Satured and Insaturated fatty acids. A Satured fatty acid is one with full number of hydrogen atoms and no double bond is present in the structure. E.g stearic acid(C17H35COOH).
They have high melting points.
Unsaturated fatty acids: these are acids with double bonds in their structure. They usually have lower melting points. E.g: Oleic acid (C17H33COOH)
CH3(CH2)7CH= CH(CH2)7COOH
Each fatty acid contains a long hydrocarbon non polar tail and a hydrophilic head which is polar. A hydrocarbon tail does not react with water (hydrophilic) while the carboxylic head is water loving (hydrophilic).
