The disinfectant and several technique used to kill microbes and harmful pathogens.

2. These are chemical substances which
inhibit the growth or kill microorganism
on inanimate objects such as instruments.
DISINFECTANTS

4. Characteristics of an ideal disinfectants
• Chemically stable
• Cheap
• Nonstaining
• Cidal, destroying spores as well.
• Active against all pathogens
• Require brief time of of exposure
• Active even in presence of blood, pus, exudates
and excreta.

6. • Earliest used , reference standard
• Protoplasmic poison
• Injures tissues & cells at high conc.
• Denauration of bacterial proteins
• To disinfect urine , faeces , pus.
PHENOL

7. • Rapidly acting , broad-spectrum agent.
• Acts by iodinating and oxidizing microbial
protoplasm
• Use for cuts, degerming skin before surgery.
• High conc. cause burns.
IODINE

8. • Rapidly acting potent germicide.
• 0.1-0.25 ppm kills most pathogen in 30 secs.
CHLORINE

9. • Methyl derivative of phenol
• Less damaging to tissues than phenol.
• 3-10 times more active
• Use for disinfection of utensils , excreta & for
washing hands.
CRESOL(Lysol)

10. • Phenol derivative
• Doesnot coagulate proteins
• Noncorrosive, nonirritating to skin
• Commercial 4.8% solution used for surgical
antiseptics
• Skin cream and soap 0.8%
• Mouth wash 1%
CHLOROXYLENOL(Dettol)

11. • Purple crystals ,highly water soluble , liberates
oxygen
• Action is slow, high conc. cause burns
• Used for gargling ,irrigating cavities & wounds
• Also used to disinfect water in ponds
POTTASIUM
PERMANGANATE