The Control of Microbial Growth
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1 The Control of Microbial Growth Sepsis refers to microbial contamination. Asepsis is the absence of significant contamination. Aseptic surgery techniques prevent microbial contamination of wounds. Terminology Sterilization: Removal of all microbial life Commercial Sterilization: Killing C. botulinum endospores Disinfection: Removal of pathogens Antisepsis: Removal of pathogens from living tissue Degerming: Removal of microbes from a limited area Sanitization: Lower microbial counts on eating utensils Biocide/Germicide: Kills microbes Bacteriostasis: Inhibiting, not killing, microbes Decimal Reduction or D Value Bacterial populations die at a constant logarithmic rate. Figure 7.1a 1
2 Situational Considerations Daily Life Hospitals Microbiology Laboratories Food and Food Production Facilities Water Treatment Facilities Other Industries Effectiveness of antimicrobial treatment depends on: Number of microbes Environment (organic matter, temperature, biofilms) Time of exposure Type of microorganism Figure 7.1b Actions of Microbial Control Agents Alteration of membrane permeability Damage to proteins Damage to nucleic acids 2
3 Heat Moist heat denatures proteins Autoclave: Steam under pressure Figure 7.2 Physical Methods of Microbial Control Pasteurization reduces spoilage organisms and pathogens Equivalent treatments 63 C for 30 min High-temperature short-time 72 C for 15 sec Ultra-high-temperature: 140 C for <1 sec Thermoduric organisms survive 3
4 Physical Methods of Microbial Control Dry Heat Sterilization kills by oxidation Flaming Incineration Hot-air sterilization Hot-air Autoclave Equivalent treatments 200 C, 90 minutes 121 C, 15 min Physical Methods of Microbial Control Filtration removes microbes Low temperature inhibits microbial growth Refrigeration Deep freezing High pressure denatures proteins Desiccation prevents metabolism Lyophilization or freeze-drying Osmotic pressure causes plasmolysis Use salts and sugars to create a hypertonic environment Physical Methods of Microbial Control Radiation damages DNA Ionizing radiation (X rays, gamma rays, electron beams) Nonionizing radiation (UV) (Microwaves kill by heat; not especially antimicrobial) 4
5 Figure 7.5 Chemical Methods of Microbial Control Principles of effective disinfection Concentration of disinfectant Organic matter ph Time Chemical Methods of Microbial Control Evaluating a disinfectant Disk-diffusion method Figure 7.6 5
6 Phenol Phenolics. Lysol Bisphenols. Hexachlorophene, Triclosan Disrupt plasma membranes Figure 7.7 Halogens. Iodine, Chlorine Oxidizing agents Bleach is hypochlorous acid (HOCl) Alcohols. Ethanol, isopropanol Denature proteins, dissolve lipids Table 7.6 6
7 Surface-Active Agents or Surfactants Soap Acid-anionic detergents Quarternary ammonium compounds Cationic detergents Degerming Sanitizing Bactericidal, Denature proteins, disrupt plasma membrane Chemical Food Preservatives Organic Acids Inhibit metabolism Sorbic acid, benzoic acid, calcium propionate Control molds and bacteria in foods and cosmetics Nitrite prevents endospore germination Antibiotics. Nisin and natamycin prevent spoilage of cheese Aldehydes Inactivate proteins by cross-linking with functional groups ( NH 2, OH, COOH, SH) Glutaraldehyde, formaldehyde Gaseous Sterilants Denature proteins Ethylene oxide Peroxygens Oxidizing agents O 3, H 2 O 2 7
8 Microbial Characteristics and Microbial Control Figure
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