PSI Barbering Practice Exam

What common ingredient in dandruff shampoos functions as a cationic compound?

1. Quaternary ammonium compounds

2. Silicone

3. Sodium chloride

4. Glycerin

The correct answer is: Quaternary ammonium compounds

Quaternary ammonium compounds are commonly used in dandruff shampoos due to their properties as cationic agents. Cationic compounds possess a positive charge, which allows them to effectively interact with the negatively charged surfaces of hair and skin. This characteristic helps in delivering conditioning benefits, as they can help to neutralize static electricity and provide a smoother texture to the hair. In the context of dandruff shampoos, the cationic nature of quaternary ammonium compounds also aids in targeting the microorganisms that may contribute to dandruff, providing antifungal protection. These compounds can help reduce flaking and soothe the scalp, making them effective in treating dandruff and improving overall scalp health. The other ingredients listed serve different functions in hair care products. Silicone is primarily used for its conditioning and smoothing properties, sodium chloride acts as a thickening agent or preservative, and glycerin is known for its humectant properties, attracting moisture to the hair. However, these do not function as cationic compounds like quaternary ammonium compounds do.