ANSC 303 Notes Lipids.docx - ANSC 303 Notes Lipids L1...

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ANSC 303 Notes Lipids L1. Lipids - Lipids are generally insoluble in water - Important source of energy - Component of the cell membrane (lipid bilayer) - Provide insulation - Supply essential fatty acids - Important for the synthesis of hormones - Important for the absorption of fat-soluble vitamins - Palatability – condition of feed and ↓ dust Fatty Acids - Fatty acids are straight chain hydrocarbons - Terminate in a carboxyl group - From 4 to 24 carbons CH 3 – (CH 2 ) n – COOH - Component of complex lipids - 2 types of fatty acids: o Saturated fatty acids (SFA) Contain no carbon = carbon double bonds Contain all of the hydrogen they can possibly hold o Unsaturated fatty acids (UFA) Contain 1 or more carbon = carbon double bond(s) Missing 2 hydrogens per double bond Double bonds exist in cis or trans conformations Two types of UFA Monounsaturated fatty acids (MUFA) o Contain 1 carbon = carbon double bond Polyunsaturated fatty acids (PUFA) o Contain 2 or more carbon = carbon double bond(s) - Double bonds are crucial because they’re important for membrane fluidity o Allow membranes to maintain a fluid structure and increase permeability o More double bonds = ↓ melting point o Oils (have lots of double bonds) = liquid at room temperature o Fats (have few double bonds) = solid at room temperature

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