chapter 7

Halogens ie chlorine and iodine oxidize proteins

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Unformatted text preview: uickly Benefit: low toxicity to humans makes it a good antiseptic Chemical Methods Chemical Methods 2. Ethylene oxide gas Combines with cellular proteins (enzymes) Sterilizing agent, kills all microbes Limitations: potential explosions; toxicity to humans­ requires special sterilization chamber Benefits: good for sterilization of heat­ sensitive items like plastics and electrical implants (i.e. pacemakers) Chemical Methods Chemical Methods 3. Halogens: i.e. chlorine and iodine Oxidize proteins Effective against all microbes Disinfectants: chlorine Cheap but can irritate skin, so not used as an antiseptic usually Example: low concentration used for drinking water, pool maintenance Antiseptics: iodine Cheap and safe for skin Example: used as tincture in alcohol (Betadine, provoiodine); often stains skin yellow Chemical Methods Chemical Methods 4. Phenolics: i.e. phenol and cresol One of first disinfectants used (recall Lister) Destroys cytoplasmic membranes and denature...
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