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Unformatted text preview: TYPES OF DISINFECTANTS PEROXYGENS (oxidizing agents)­­­these oxidize cellular components of microbes. a. OZONE (O3)­­­highly reactive form of oxygen, often used along with chlorine to disinfect water b. HYDROGEN PEROXIDE­­­although frequently used, it is a poor choice as an antiseptic for open wounds, because human cells contain the enzyme catalase, which breaks down the peroxide before it has much chance to act. (This is where the bubbles come from). It is an effective disinfectant for inanimate objects, where it can even kill endospores. It is used to disinfect food packaging (before the food is put in) and contact lenses. Although peroxide does not directly kill microbes well in wounds, it is used in deep wounds because it releases oxygen as it breaks down, which makes conditions unfavorable for anaerobic bacteria. c. BENZOYL PEROXIDE­­­main ingredient in many acne treatments d. PERACETIC ACID­­­excellent chemical sporicidal agent and is considered a chemical sterilant which acts within 30 minutes (much faster than the others). Vegetative bacteria and funig are killed in 5 minutes. It is used in food processing and for medical equipment, where it leaves no residue and can act in the presence of organic matter. RESISTANT MICROBES Susceptibility to chemical antimicrobials varies considerably among microbes: 1. Most gram­positive bacteria are relatively susceptible to chemical agents, with the mycobacteria the major exception. 2. Gram­negative bacteria tend to be more resistant, with Pseudomonas the worst 3. Endospores are most resistant 4. Viruses a. Some viruses have a lipid­containing envelope surrounding them (enveloped viruses). These are much more susceptible to chemical agents. b. Nonenveloped viruses are much more resistant. ...
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  • Fall '09
  • 5 minutes, oxidize cellular components, disinfect food packaging, ­­­highly reactive form, BENZOYL PEROXIDE­­­main ingredient

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