Lipids - G. Modifications of fats and oils - Intereserification

6 important questions on Lipids - G. Modifications of fats and oils - Intereserification

What do you need to let the interesterification reaction take place?

High tempratures (above 300 degrees), but this is not realy wanted because you decompose the triglycerides.

A better option is to use a n catalysis like  sodium hydroxide, sodium alcoholates.

What are the different steps in the interesterification process?

  1. Formation of anion (R-O-)
  2. Interesterification
  3. Intraesterification

What is the difference between intra and inter esterification?

Intra is a change of fatty acid order in one triglyceride

Inter is a exchange of fatty acids between differ triglycerides
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What is the effect of interesterification?

  • A higher melting point
  • A more homogeneous triglyceride composition.

You see a mix of palm and sunflower oil. Which one is interesterified and which one is not?

D is more homogeneous  and C is less homogeneous.
Therefore D is interesterified.  

Also the  LLL went down and you have higher peaks in the end what indicates an higher melting point. This also indicates interesterification. HOWEVER this is not a general rule.

Fractionation and then interesterification leads to four different products:
- palm oil, interesterified & not
- palm olein, interesterified & not

M myristic (14:0),
P palmitic (16:0),
St stearic (18:0),
O oleic (18:1),
L linoleic (18:2).
S saturated, U unsaturated fatty acids.

Which products are the interesterified, products A1 & B1 or products A2 & B2. Explain your choice. (4 pts)

A2 and B2 are interesterified because the there is an more equal ditribution between SSS, SUS, SUU and UUU. And big peaks went down and smaller peaks when up. This indicates a more equaly distribution so interesterification.

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