Lipids

• What is a triglyceride

  • Usually solid at 20ºC
  • Glycerol + 3 fatty acids
• Whst is the structure of glycerol?

  • C3H5(OH)3
  • Alcohol
  • propan-1,2,3-triol
• What is the test for lipids?

  • Emulsion test
  • Crush sample
  • Add ethanol + distilled water
  • Milky-white emulsion if positive
• What is the structure of a phospholipid?

  • phosphate group + glycerol + 2 fatty acids
  • Hydrophillic head (attracted to water)
  • Hydrophobic fatty acid tail (repels water)
• What is an ester bond?

  • Bond between fatty acid + glycerol
  • Condensation reaction
• What is an unsaturated fatty acid?

  • A fatty acid with a double bond in the carbon chain causing it to kink
  • This makes it less dense, liquid at room temp and healthier
• What is a saturated fatty acid?

  • Single bonds in the carbon chain making it solid at room temp, dense and unhealthy
• What is the functional group of a fatty acid?

  • RCOOH, carboxylic acid group