Final answer:
Quaternary ammonium compounds are used for disinfecting tools such as combs and brushes and are effective due to their ability to disrupt bacterial cell membranes. They are superior to soaps, particularly in hard water, as they do not leave residue.
Step-by-step explanation:
For tools and implements such as combs, brushes, rollers, rods, which do not have sharp edges or points, it is essential to use a disinfecting solution according to the manufacturer's instructions. When using a solution containing quaternary ammonium compounds, a staple in many disinfectants and antiseptics, you must fully immerse these tools. Quaternary ammonium compounds, or quats, are effective due to their ability to disrupt bacterial cell membranes, leading to cell death. These compounds are cationic detergents, which have cleansing properties and are known to be stable, nontoxic, and effectively work against a broad range of microbes, including fungi, protozoans, and enveloped viruses. However, they are not effective against endospores. Because of their structure, with a hydrophobic tail and a hydrophilic cationic head, they are more soluble in water and do not leave behind a residue, making them superior to soaps, especially in hard water conditions.