Emulsifiers with relatively strong hydrophobic groups produce which type of emulsion?

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Study for the Pharmaceutics II Exam 2 Concepts Test with flashcards and multiple choice questions. Each question has hints and explanations. Prepare effectively for your exam!

Multiple Choice

Emulsifiers with relatively strong hydrophobic groups produce which type of emulsion?

Explanation:
Emulsifiers with strong hydrophobic (lipophilic) character preferentially reside in the oil phase and orient at the oil–water interface with their hydrophobic tails in oil and their polar heads toward the water. This favors stabilizing droplets of water dispersed in oil, i.e., a water-in-oil emulsion. In contrast, more hydrophilic emulsifiers (high HLB) stabilize oil droplets dispersed in water. So the best answer is water-in-oil.

Emulsifiers with strong hydrophobic (lipophilic) character preferentially reside in the oil phase and orient at the oil–water interface with their hydrophobic tails in oil and their polar heads toward the water. This favors stabilizing droplets of water dispersed in oil, i.e., a water-in-oil emulsion. In contrast, more hydrophilic emulsifiers (high HLB) stabilize oil droplets dispersed in water. So the best answer is water-in-oil.

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