Lipids - G. Modifications of fats and oils - Hydrogenation
7 important questions on Lipids - G. Modifications of fats and oils - Hydrogenation
What happens in a hydrogenation reaction with as catalyzer nikkel and there is not enough hydrogen, so an incomplete reaction?
- positional isomer
- cis bond
- or a trans bond
1 ad 3 can also happen combined
If you have 18:1, 9 cis what trans fatty acids can be formed?
e.g. 18:1, 9c --> 18:1, 9t
and/or
Positional: double bond has been moved to other positions along the carbon chain
e.g. 18:1, 9c --> 18:1, 11t
What are the three possible geometrical TFA isomers of 18:2, 9c, 12c?
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What is the effect of hydrogenation on the melting point?
What are the factors that effect hydrogenation?
- Temperature
- Hydrogen gas pressure
- Catalyst activity and concentration
- Agitation
- Time
Does an increase in hydrogen pressure will more likely increase or decrease the formation of trans fatty acids
What is selectivity during hydrogenation?
S(3,2)=K(3)/K(2)=2
Meaning the selectivity is 2 which means that the reaction of 3 double bonds to 2 double bonds is twice as fast at the reaction form 2 double bonds to 1 double bond.
K3 needs to be as high as possible
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