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Lipids Outline - CHEMISTRY 120 CHAPTER 15 REVIEW LIPIDS...

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CHEMISTRY 120 CHAPTER 15 – REVIEW LIPIDS Lipid functions: storage energy, protect, insulate, chemical messengers, membranes. Lipid composition: mainly carbon and hydrogen. Soluble in organic solvents. Types of lipids : Fatty acids and steroids. o Fatty acids : long chain (12-18 carbon atoms) carboxylic acids Sataurated: no double bonds. o Mainly from animal sources. o Solids at room temperature (high melting point). Unsaturated: double bonds. o Contain 1 or more cis (bulky groups on same side) double bonds. o Plant sources. Liquids at room temperature. Essential: must be obtained from diet. We cannot make them. o Arachidonic, linoleic and linolenic acids. Omega-3 fatty acids: have double bond 3 carbons from end. o Source is cold water fish. Waxes : Structure: Esters of saturated fatty acids and long- chain alcohols. Function: Coatings that prevent loss of water from leaves of plants. Triacylglycerols : fats and oils.
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