2.2.1 classification of lipids-r

2.2.1 classification of lipids-r - 2.2.1 Classification of...

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2.2.1 Classification of  Lipids
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: organic molecules that dissolve  in organic solvents but not in  water  therefore described as  hydrophobic   (“water fearing”)  molecules
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Family of lipids include   triglycerides    fats  and oils   lipids stored in  the body   phospholipids   membranes   sterols   cholesterol; sex hormones;  bile  acids; adrenal hormones
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Fatty Acids  (FA): a carbon chain (4-24 carbons  long)  with hydrogen atoms  attached,  sandwiched between a  methyl group and  an acid group Fig 7.1
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Double Bonds Between Carbons Saturated fat    double bonds Monounsaturated fat        1 double bond Polyunsaturated fat   2 or more double bonds Fig 7.3
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Double bonds cause ‘kinks’ in the fatty acid chain  making oils liquid at room temperature
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(18:1) (18:2) (18:0) Fatty acids are  named according  to # C atoms  # double bonds stearic acid oleic acid linoleic acid
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Essential Fatty Acids :  linolenic acid (18:3)  linoleic acid (18:2)
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Fig 7.5 Proportion of SFA, MUFA and PUFA varies  
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2.2.1 classification of lipids-r - 2.2.1 Classification of...

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