Assignments - Lipid oxidation

3 important questions on Assignments - Lipid oxidation

Pick the fatty acids that can produce MDA as a secondary lipid oxidation product during lipid oxidation.

  • Stearic acid (18:0)
  • Oleic acid (18:1 n-9)
  • Linoleic acid (18:2 n-6)
  • Alpha-linolenic acid (18:3 n-3)
  • Arachidonic acid (20:4 n-6)
  • Docosahexaenoic acid or DHA (22:6 n-3)

  • Stearic acid (18:0)
  • Oleic acid (18:1 n-9)
  • Linoleic acid (18:2 n-6)
  • Alpha-linolenic acid (18:3 n-3)
  • Arachidonic acid (20:4 n-6)
  • Docosahexaenoic acid or DHA (22:6 n-3)

Which layer corresponds to your lipid extract?
  • Upper organic layer
  • Bottom polar layer
  • Interface

  • Upper organic layer
  • Bottom polar layer
  • Interface


The lipid will go to the hexane layer, which correspond to the organic layer.

A low hydroperoxide concentration can reflect ...
  • The early stage of lipid oxidation
  • The intermediate stage of lipid oxidation
  • The late stage of lipid oxidation

  • The early stage of lipid oxidation
  • The intermediate stage of lipid oxidation
  • The late stage of lipid oxidation

The concentration of hydroperoxides is usually low at the start of the lipid oxidation, when they are not already formed and at the end of lipid oxidation, when their degradation becomes more important than their formation.

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