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Lipids: a large and varied group of organic compounds. Lipids include: Triglycerides.

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Presentation on theme: "Lipids: a large and varied group of organic compounds. Lipids include: Triglycerides."— Presentation transcript:

1 Lipids: a large and varied group of organic compounds. Lipids include: Triglycerides

2 Lipids: a large and varied group of organic compounds. Triglycerides include Phospholipids

3 Triglycerides consist of one molecule of glycerol bonded to three fatty acid molecules Each fatty acid is linked to the glycerol molecule by an ester bond CCC H OH H HH H Glycerol Hydroxyl groups

4 Fatty Acids: General Formula: CH 3 (CH 2 ) n C O OH Carboxyl group H CCC H H HH H H CCC H H HH H H C O OH CH 3 CH 2

5 H CCC H H HH H H CCC H H HH H H C O OH Can be drawn as: C O OH

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7 A cis fatty acid A trans fatty acid

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9 LDL bad HDL good

10 Forming a monoglyceride: C C C HOH H H H H OHOH C O C C C H H H H H O C O + H 2 O Ester bond Hydroxyl group and carboxyl group react This is a condensation reaction

11 C C C H O H H H H O O C O C O C O A triglyceride: Can be drawn as: Glycerol Fatty acid Ester bond

12 To split these ester bonds and separate a fatty acid from glycerol we need to add a molecule of water C C C HOH H H H H O C O + H 2 O C C C HOH H H H H OHOH C O This is a hydrolysis reaction

13 Lipids: a large and varied group of organic compounds. Lipids include: Cholesterol

14 Uses of Lipids in Living Things 1. Long-term energy stores Human Adipose TissuePlant Oils

15 2. Buoyancy for marine animals: lipids are less dense than water so help animals float 3. Insulation: a layer of fat beneath the skin cuts down heat loss

16 4. Production of water: fatty acids produce a lot of metabolic water when they are oxidised during respiration e.g. C 17 H 35 COOH + 26 O 2 18 CO H 2 O (a typical fatty acid) Camels humps are made of fat


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