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Lipids Triglycerides- fats and oils Phospoglycerides- lecithin Sterols- cholesterol.

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Presentation on theme: "Lipids Triglycerides- fats and oils Phospoglycerides- lecithin Sterols- cholesterol."— Presentation transcript:

1 Lipids Triglycerides- fats and oils Phospoglycerides- lecithin Sterols- cholesterol

2 Triglycerides Neutral fats- triesters of fatty acids and glycerol Fats- solid at room temperature Olis- liquid at room temperature

3 Fatty acids Glycerol Stearic acid Linoleic acid

4 Glycerol + 3 fatty acids Triglyceride + water Trigycerides + H 2 O

5 Saturated or unsaturated fats/oils? Saturated- no double bonds Unsaturated- one or more double bonds Polyunsaturated- many double bonds Cis- or trans-double bonds Oleic acid Lauric acid

6 Linoleic acid,  -6, Mp -5 ºC Stearic acid, Mp 70 ºC  -6 and  -3 fatty acids are essential

7 Linoleic acid,  -6, Mp -5 ºC  -6 and  -3 fatty acids are essential Linolenic acid,  -3, Mp -11 ºC

8 Phosphoglycerides

9 Cell membrane

10 Steroids Cholesterol, sexual hormones Carotenoids – fat-soluble vitamins

11 Stereoids OestradiolCholesterolTestosterone

12 Lipid transport in the cells Low-density lipoproteins LDL- good High-density lipoproteins HDL- bad

13 Carotenoids Vitamin A (retinol) Me = CH 3 red

14 Carotenoides, forts Vitamin D Vitamin EVitamin K

15 Analysis of lipids Iodine or bromine number Addition of I 2 or Br 2 Unsaturated fatty acid Brominated fatty acid

16 Roles of lipids in the body (+) Energy storage Insulation and protection of organs Structural components of cell membranes  -3 poly-unsaturated fatty acids reduce the risk of heart disease poly-unsaturated fats may lower levels of LDL cholesterol

17 Roles of lipids in the body (-) Increased risk of heart disease from elevated levels of LDL cholesterol and trans-fatty acids The major source of LDL cholesterol is saturated fats (C 12, C 14 and C 16 fatty acids) Obesity


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