Lecture Notes: Clove Essential Oil Experiment (PSC 501)

Introduction

• Lecturer: Dr. Kamran
• Subject: First experiment of PSC 501 on Clove Essential Oil
• Components: Presence of oil, identification, volatile oil determination, moisture content

Experiments Overview

1. Presence of Oil in Plant Material
2. Identification Test for Clove
   • Adapted from British Pharmacopoeia 2011
3. Determination of Volatile Oil
   • Based on steam distillation
   • Also adapted from British Pharmacopoeia 2011
4. Determination of Moisture Content
   • Using the Dean Stark method

Volatile Oils

• Definition: Mixture of terpenes (unsaturated hydrocarbons) and oxygenated derivatives
• Characteristics:
  • Soluble in organic solvents, partially soluble in water
  • Strong smell, do not leave permanent spot on paper
  • Extractable by non-polar solvents or steam distillation
• Difference from Fixed Oils: Volatile oils do not leave a permanent spot on paper

Clove Flower Bud

• Source: Syzygium aromaticum (Family: Myritaceae)
• Main Constituent: Eugenol (83-95% of oil)
  • Properties: Fruity smell, boiling point 254°C, density 1.06
  • Uses: Spices, flavoring, dental toothache treatment

Experiment Details

1. Presence of Oil in Plant Material

• Method: Crush and smell the plant material
• Procedure:
  • Crush between fingers, observe odor
  • Spot test on filter paper and heat to differentiate fixed vs. volatile oils

2. Identification Test for Clove

• Method: TLC (Thin Layer Chromatography)
• Preparation:
  • Test Solution: Mix drug powder with dichloromethane, filter, dissolve in toluene
  • Standard Solution: Mix eugenol with toluene
• Process:
  • Apply test and standard solutions on TLC plate
  • Compare Rf values under UV light

3. Determination of Volatile Oil

• Method: Steam Distillation
• Apparatus: Clavenger apparatus
• Process:
  • Heat plant material with water
  • Collect and separate oil and aqueous phases
  • Confirm presence of oil by smell

4. Moisture Content Determination

• Method: Dean Stark
• Principle: Azeotropic mixture formation
• Apparatus:
  • Distillation setup with toluene
  • Measure water separated during distillation

Conclusion

• Practical briefing on essential oil extraction from clove
• Queries can be directed to Dr. Kamran

Note: This lecture provided a comprehensive overview of methods used in the extraction and identification of clove essential oil, emphasizing practical lab techniques and scientific principles.