Lipids - Carbon makes four bonds Lipids Atomic number 6 Two...

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1/3/11 1 Lipids Carbon makes four bonds Atomic number 6 Two electrons in first shell, four in valence shell Four covalent bonds is most stable arrangement Chains and rings can form Lipids Made of carbon (C) and hydrogen (H) and are not soluble in water Triglycerides Steroids Waxes Phospholipids Glycerol Small organic molecule with three “linking” positions
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1/3/11 2 Triglycerides = fats and oils Glycerol is the backbone, and three fatty acids are hooked on The different fatty acids have more or less C’s in their chains, and may have double bonds Double bond = covalent sharing of two pairs of electrons Double bonds put “kinks” in the fatty acid chain Saturated/Unsaturated Saturated no double bonds; pack well; solid fats (animal products) Unsaturated double bond(s); pack poorly; liquid oils (plant products) Trans Fats Commercial preparation of fats like margarine takes vegetable oil and adds in hydrogens “hydrogenation” The oil gets more solid & less healthy Were typically used in processed food such as chips, doughnuts, fries, etc.
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