lipids 3.1.3

Lipids

• triglycerides and phospholipids are two groups of lipid.
• Triglycerides are formed by the condensation of one molecule of glycerol and three molecules of fatty acid. (https://goo.gl/images/NKcT6P)
• a condensation reaction between glycerol and a fatty acid (ROOH) forms and ester bond.
• the R-group of a fatty acid my be saturated (only single carbon bonds ) or unsaturated (at least one double carbon bond)
• In phospholipids, one of the fatty acids of a triglyceride is substituted by a phosphate-containing group. (https://goo.gl/images/0W4rhP)
  • the presence of the phosphate group means that the ‘head’ is attracted to water (hydrophilic).
  • the hydrocarbon tails do not mix with water (hydrophobic)
  • when mixed with water they arrange themselves in a double layer with their hydrophobic tails pointing inwards and their…