2.7 Fragrances and Skincare Flashcards
What are essential oils?
Extracts from the hydrophobic aroma compounds from plants
How are essential oils removed from plants?
By a process called steam distillation
What are essential oils used for?
Perfumes, cosmetics, cleaning products, and flavourings
What are they key components in most essential oils?
Terpenes
What is the systematic name for isoprene?
2-methylbuta-1,3-diene
What is a terpanoid?
A terpene which has been oxidised
How are free radicals formed?
UV light breaks bonds
What are the 3 stages in the free radical chain reaction?
Initiation
Propagation
Termination
What happens during initiation?
UV light forms free radicals
(free radicals only on right side of arrow)
What happens during propagation?
Free radicals collide with other species but the number of free radicals remains
(free radicals on both sides of the arrow)
What happens during termination?
Free radicals are used up by collision with each other
(free radicals only on left side of arrow)
What is a free radical scavenger?
A molecule which can react with free radicals to form stable molecules and prevent chain reactions
