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Questions and Answers
Which type of emulsion involves oil droplets dispersed in water?
Which type of emulsion involves oil droplets dispersed in water?
What is a key advantage of emulsions that helps with drug delivery?
What is a key advantage of emulsions that helps with drug delivery?
Which test can be used to identify the continuous phase of an emulsion?
Which test can be used to identify the continuous phase of an emulsion?
What type of emulsifying agent is characterized by having no charge?
What type of emulsifying agent is characterized by having no charge?
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Which emulsion type is best for achieving a greater emollient effect?
Which emulsion type is best for achieving a greater emollient effect?
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What does the HLB method assist with in emulsion formulation?
What does the HLB method assist with in emulsion formulation?
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Which of the following describes a characteristic of emulsions?
Which of the following describes a characteristic of emulsions?
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What type of emulsion involves a complex structure of water droplets dispersed in oil droplets?
What type of emulsion involves a complex structure of water droplets dispersed in oil droplets?
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Study Notes
Dosage Forms I
- Presented by Pierre A. Hanna, B.Sc., M.Sc., Ph.D.
- From the Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Suez Canal University, Egypt.
Disperse Systems: Emulsions
- Emulsions are disperse systems
- Comprise two immiscible liquids
- One liquid is finely divided into droplets and uniformly dispersed in the other
- Droplet size is greater than 0.1 µm
- Stabilized by an emulsifying agent
Types of Emulsions
- Oil-in-water (o/w)
- Water-in-oil (w/o)
- Water-in-oil-in-water (w/o/w)
- Oil-in-water-in-oil (o/w/o)
Advantages of Emulsions
- Taste masking
- Increased penetration
- Enhanced efficacy (particularly for antiseptics, in o/w emulsions)
- Controlled absorption and penetration
- Improved emollient effect (in w/o emulsions)
Tests for Identifying Emulsion Type
- Miscibility tests: Examining the external phase
- Conductivity measurements: Aqueous continuous phases readily conduct electricity
- Staining tests: Using water-soluble and oil-soluble dyes
Additional Advantages of Emulsions
- Small and uniform droplet size
- Homogeneous nature
- Avoidance of creaming and redispersion
Types of Emulsifying Agents
- Non-ionic
- Anionic
- Cationic
Choosing an Emulsifying Agent
- Considering toxicity and irritancy
- Using the hydrophile-lipophile balance (HLB) method
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Description
This quiz covers the fundamental aspects of emulsions as a type of disperse system. Learn about the different types of emulsions, their advantages, and how to identify them through various tests. Ideal for students in the field of pharmacy and pharmaceutics.
