Aromatherapy Essential Oil Extraction Methods

Question 1

Which extraction method uses steam to release volatile compounds from plant material?

Accepted Answer

Steam distillation

Answer

Steam distillation passes steam through plant material, causing volatile compounds to vaporize and then condense into essential oil and hydrosol.

Question 2

What water-based byproduct is produced alongside essential oil during steam distillation?

Accepted Answer

Hydrosol (floral water)

Answer

Hydrosol (floral water) is the aqueous byproduct containing trace aromatic compounds that separates from the essential oil after distillation.

Question 3

Which extraction method is primarily used for producing citrus essential oils such as lemon and sweet orange?

Accepted Answer

Cold pressing (expression)

Answer

Cold pressing (expression) mechanically presses the rind of citrus fruits to release the essential oil, preserving the fresh aroma without heat.

Question 4

What is an 'absolute' in aromatherapy production?

Accepted Answer

A highly concentrated aromatic extract obtained using chemical solvents

Answer

An absolute is a highly concentrated aromatic extract produced through solvent extraction, commonly used for delicate flowers like jasmine and rose.

Question 5

Which extraction method is considered to best preserve the complete natural chemical profile of the plant due to low operating temperatures?

Accepted Answer

Supercritical CO2 extraction

Answer

Supercritical CO2 extraction uses carbon dioxide at controlled pressure and temperature, producing an extract that closely mirrors the plant's original chemistry without heat degradation.

Aromatherapy Practice Test

Aromatherapy Practice Test

Aromatherapy Essential Oil Extraction Methods