C1.6 Plant oils
- Created by: frankie306
- Created on: 07-06-15 17:14
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- C1.6 Plant oils
- extracting vegetable oil
- using steam (distillation)
- important foods - contain nutrients
- biofuels - biodiesel
- unsaturated oils - C=C bonds
- + bromine water = colourless solution
- Cooking with veg oils
- useful
- high boiling points
- increases energy content of food
- hardened to
- increase melting points
- make them solids at room temp
- e.g. butter - suitable for spreading
- Hardening
- 60 degrees Celcius
- nickel catalyst
- Hydrogen add onto C=C bonds in molecules
- known as hydrogenated oils
- useful
- Emulsions
- mixture of oil and water
- emulsifier = substance that prevents oil and water from seperating
- hydrophobic
- long hydrocarbon
- 'tail' dissolve in oil
- hydrophilic
- 'head' sticks out in water
- like charges repel and so oil droplets repel each other
- emulsifiers = make texture better
- extracting vegetable oil
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