Fragrances

Question 1

What are essential oils?

Answer 1

Concentrated extracts from plants which are:

• volatile
• non water soluble
• aroma compounds

Question 2

Define volatile ?

Answer 2

It means they vaporise easily

Question 3

How are essential oils extracted . Or what is the process of extracting essential oils?

Answer 3

Distillation

Question 4

What are terpenes ?

Answer 4

• the most common compounds found in essential oils are the family of compounds called terpenes
• terpenes are unsaturated and made up of isoprenes

Question 5

Give the formula for isoprene and it’s systematic name ?

Answer 5

(C5H8)

Systematic name:
2-methylbuta-1,3-diene

(These join to make terpenes)

Question 6

How to know if a terpenes has undergoed oxidation ?

What is an oxidised terpenes called?

Answer 6

• A change in taste and smell

- terpenoids

Question 7

Many terpenes oxidise in plants to produce aromas of spices.

Peppermint flavour contains - the terpenes of methanol and also methone (oxidise methanol)

Answer 7

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