HSN104 Science of food - weeks 3&4 - Lipids

Question 1

Is this a peroxide? Why / why not?

Answer 1

Yes. It is a COOH group (note the single bonds between the C-O-O).

Question 2

Auto-oxidative rancidity occurs:
A. most often in saturated triglycerides.
B. only at low temperatures.
C. as a result of enzyme driven hydrolysis of triacylglycerols.
D. independent of the action of enzymes.

Answer 2

A: false. Most often in unsaturated triglycerides.

B: false. Requires energy, e.g. heat.

C: false. Lipolysios happens with the aid of enzymes.

D: true. Happens with the help of energy (e.g. heat) and can happen in the presence of metal ions or free radicals.