FRAGRANCE AND SKIN CARE PART 2

Question 1

Essential oils

Answer 1

volatile, non-water soluble aroma compounds extracted from plants by steam distillery

Question 2

how are essential oils extracted

Answer 2

steam distillery - using test tube with ceramic wool soaked in water, dry and peels/leafs then heating, travelling through tube to condenser into a beaker which forms oil layer on top of water

Question 3

Terpene

Answer 3

Unsaturated compund formed by joining isoprene units

Question 4

terpene chemical formula

Answer 4

2-methylbuta-1,3-diene

5C with double bond 3 attached to one then one other

Question 5

linear isoprene

Answer 5

attached head to tail

Question 6

types of isporene

Answer 6

linear

cyclical

Question 7

oxidised terpene

Answer 7

lose unsaturation

OH groups introduced

form alcohol or aldehyde

Question 8

terpene use

Answer 8

perfume, flavours in food

Question 9

uv produces

Answer 9

free radicals which damage skin

Question 10

3 stages of free radical chain

Answer 10

initiation: form free radical from UV

propagation: end with same number of free radicals on either side

termination: 2 free radicals together to form stable product

Question 11

limit UV damage

Answer 11

sun cream or sunblock

Question 12

what does sun block/cream contain

Answer 12

chemicals that absorb UV radiation

contain free radical scavengers

Question 13

free radical scavangers

Answer 13

react with free radicals to produce stable products