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<\/p>\nLipids are formed of Carbon, Hydrogen and often Oxygen where Oxygen content is very small as compared to other two elements.<\/p>\n
Lipids do not form polymers in nature except cutin (polymere of fatty acids). Some lipids also contain small amounts of phosphorus, nitrogen and rarely sulphur. Most lipids are formed of fatty acids. In animals fats are present in sub cutaneous layer and work as food reservoir and shock absorber. Lipids require more oxygen for their complete oxidation as compared to carbohydrates but produces double the energy in its comparison.<\/p>\n
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They are lipids formed of fatty acids and alcohol without any additional group.<\/p>\n
e.g. fats or true fats, wax like cutin, suberin. They are of two types:<\/p>\n
(a)<\/strong> Neutral fats and oils\u00a0 (b)<\/strong> Waxes<\/p>\n I Neutral Fats:<\/strong> They are esters of three molecules of fatty acids and one molecule of glycerol. Hence, they are also called triglycerides. Two components explained in brief are as follows:<\/p>\n CH2<\/sub> \u2014 OH Triglycerides:<\/strong> formed by ester linkage of glycerol with the three molecules of fatty acids.<\/p>\n Ester is formed due to reaction between carboxylic group of an organic acid and hydroxyl group of an alcohol removing a water molecule and producing an ester linkage.<\/p>\n Wax present in blood is cholesterol palmitate. Wax is generally soft and pliable when warm and hard when cold. It is water resistant and function in natural water-proofing of feathers, fur, human skin, insect exoskeleton, leaves and fruits.<\/p>\n\n
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\nCH \u2014 OH
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\nCH2<\/sub> \u2014 OH<\/p>\n\n
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