AVS-3100 Lecture 3: Disinfectants Lecture 3
9 Feb 2017
School
Department
Course
Professor
Document Summary
Two types of disinfectants: bactericidal: little to no chance microorganism is present, bacteria killing, bacteriostatic: slows down bacteria, only temporary. Four main groups: phenols, halogens, quaternary ammonium compounds: mostly used now, formals: moving away from these. Phenols: coal and pine tar: pine oil, lister: doctor credit with wanting to stop infections, used phenols in the er/surgery, denatures proteins, cresol: phenol used commercially but is used less due to a spill in the environment. Halogens: iodine: used largely as a topical disinfectant, chlorine: chlorinated lime is bleach and used widely. Quaternaries: hydrophilic, dissolves easily, dilutes well, inactivates enzymes effectively, reducing agent, disrupts cell membranes by nding negatively charged sites. Formals: formaldehyde, formalin, very potent, volatile, disturbes respiratory mucus membranes, formaldegen gas: used commercially to disinfect places that cannot be reached with a scrub brush. Lye: like a phosphate, very effective as a rural disinfectant, oxidative.
