1. volatile oils
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2. Recap In the previous class, you learnt about Lipids Fixed Oils & Fats
Waxes
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3. On the completion of this period, you would be able to know about
Objectives
On the completion of this period, you would be able to know about
Volatile oils
Examples of volatile oils
Uses
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4. Volatile Oils
Volatile oils are responsible for odour of the crude drugs
They evaporate when exposed to air at normal temperature
They are
Liquid or solids
Volatile
Possess characteristic odour
Volatile oils are insoluble in water
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5. Volatile oils Soluble in ether, alcohol, chloroform and benzene
In plants they attract insects to help in cross pollination
Act as insect repellant to prevent their destruction
Volatile oils have high refractive index & exhibit optical rotation
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6. Volatile oils are found in various plant organs like
Flower petals Rose
Fruits Fennel
Leaves Eucalyptus
Bark Cinnamon
Woods Sandalwood
Buds Cloves
Volatile oils solid at room temperature
Camphor, Thymol, Menthol
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7. Volatile Oils In plants volatile oils are formed
In specialised secretory cells / ducts / hair / canals
Such as glandular hairs
Vittae of umbelliferous fruits
Schizogenous ducts
Lysigenous ducts
Schizolysigenous ducts
Cavities
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8. Volatile Oils
Chemically they contain terpene derivatives like alcohols, aldehydes, phenols etc.,
They can be obtained from Plant parts by Steam distillation
Fresh volatile oils are colourless liquids
Cannot be hydrolysed / saponified
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9. Volatile oils They may used as Anti fungal Antiseptic
Some of them have mild local anesthetic
Analgesic action
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10. Volatile Oils and Terpenoidal Drugs
Volatile oils are extracted by
Steam-distillation
Solvent extraction
Enfleuage
This method is used for extraction of delicate perfumes
4.Ecuelle
This method is used for extraction of citrus oils.
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11. Examples of volatile oil
Summary
In this class we learnt about
Volatile oils
Examples of volatile oil
Uses
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12. Quiz 1.Phenolic volatile oil is present in Coriander Caraway
Asafoetida
All the above
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13. Quiz 2. Dental analgesic activity is present in Coriander oil
Clove oil
Lavender oil
Rose oil
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14. Frequently Asked Questions
Explain what are volatile oils. How they are obtained from
different sources? Write examples
2. What are the uses of volatile oil
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