Mayonnaise emulsions with no antioxidant and those with caffeic acid added had a lag phase of 6–9 days for the development of 1-penten-3-one, whereas the rest of the mayonnaise emulsions
showed a lag phase of 9–12 days (Fig. 2B). After this period the concentration of 1-penten-3-one increased in all emulsions up to 28 days of storage. At day 28 the concentration of 1-penten-3-
one in the mayonnaise decreased in the following order: