Flash Player 9 (or above) is needed to view presentations.
We have detected that you do not have it on your computer. To install it, go here.

Like this presentation? Why not share!

Use Of Esters And Fatty Acids







Total Views
Views on SlideShare
Embed Views



3 Embeds 57

http://www.slideshare.net 52
http://translate.googleusercontent.com 3
http://fronter.com 2


Upload Details

Uploaded via as Microsoft PowerPoint

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
Post Comment
Edit your comment

Use Of Esters And Fatty Acids Use Of Esters And Fatty Acids Presentation Transcript

  • Use of esters and fatty acids
  • Body Shop • Fruit esters are used in products which have a fruity smell.( perfumes) • Properties include low molecular mass and boiling points. • They are volatile and so are easy to smell and flammable. • The smell doesn’t linger long. • In industry they are synthetic to cut cost
  • • A blackcurrant perfume contains ethyl butanoate. • It is made from ethanol and butanoic acid.
  • Forms Ethyl Butanoate • Ethyl • Butanoate • Water left over
  • Structure of fats and oils • It is possible to have more than one ester link between acid and alcohol. • These release more energy when oxidised than carbohydrates and so they are important to plants and animals as an energy store. • The alcohol in fats and oils is glycerol. This is a compound with 3 OH groups.
  • Glycerol forms 3 ester links with Fatty acids
  • • The Carboxylic acids in fats and oils are often called Fatty acids. • In animal fats all the bonds are single in the molecules. They are saturated because the molecule has all the hydrogen it can take. • In vegetable oils there is a double bond between each molecule. We say they are unsaturated.
  • Saturated Unsaturated Animal fat Vegetable oil
  • Properties of fats • Butter and Lard are animal fats • Has saturated molecules which are straight. • Tend to be solids. • They have a regular shape and pack together easily. • Stearic acid is typical of acids combined in animal fats.
  • What about oils? • Corn oil , olive oil and sunflower oil are examples of vegetable oils. • Oleic acid is often found in vegetable oils. • It is unsaturated. • The double bond means that the molecules are not straight. • It doesn’t pack together well so is liquid at room temperature.
  • Making soap from fats and oils. • Esters split up into an acid and alcohol when they react with water. • This type of reaction is called hydrolysis. Ester + Water exactly = acid + alcohol
  • • This is a slow reaction how could we speed it up without heating?
  • • Add a catalyst • Sodium hydroxide ( strong alkali) is used
  • What about soaps? • Hydrolysis of fats or oils by heating with sodium hydroxide or potassium hydroxide produces soaps. • Soaps are sodium or potassium salts of fatty acids.
  • What about health? • Margarine is a vegetable oil hardened by adding hydrogen to saturate it. • It turns from liquid to solid. • This a cheap and easy process.
  • Trans and cis fats • Some margarine tubs indicate that there are Trans and cis fats present. • This refers to how the hydrogen atoms are arranged either side of the double bond.
  • Cis ( same side)
  • Trans ( opposite side)
  • • Note the acid link has been omitted from the end of each diagram for simplicity. • Nearly all naturally occurring unsaturated fatty acids contain cis double bonds. • They are runnier than ones containing trans double bonds.
  • You need to know • What saturated and unsaturated mean. • The difference between a fat and an oil. • How soap is made. • What hydrolysis means. • What esters are used for and their properties.
  • What product is this? • High in polyunsaturates • Rich in omega 3 & 6 oils • Rich in folic acid • Virtually Trans fat free. • No hydrogenated oils.