Which statement about Quats is incorrect?

Which statement about Quats is incorrect?

• A. They destroy cell membranes of some viruses and bacteria
• B. They are used as disinfectant and antiseptic
• C. They are deactivated by hard water and detergents
• D. They cannot be used as antiseptics

Answer: (D)

Quats kill by disrupting lipid membranes, which compromises the integrity of many bacteria and enveloped viruses. That membrane-targeting action is why they’re effective as antimicrobial agents and are used both to disinfect surfaces and in some products formulated for skin antisepsis. The idea that they cannot be used as antiseptics is incorrect because quat-based formulations do exist for skin antisepsis in certain contexts, not just for surface disinfection. It’s true that hard water and detergents can reduce their effectiveness, but that doesn’t prevent their use as antiseptics entirely.

Quats kill by disrupting lipid membranes, which compromises the integrity of many bacteria and enveloped viruses. That membrane-targeting action is why they’re effective as antimicrobial agents and are used both to disinfect surfaces and in some products formulated for skin antisepsis. The idea that they cannot be used as antiseptics is incorrect because quat-based formulations do exist for skin antisepsis in certain contexts, not just for surface disinfection. It’s true that hard water and detergents can reduce their effectiveness, but that doesn’t prevent their use as antiseptics entirely.