control of microorganisms. control of microorganisms purpose definition activity/action to inhibit,...
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CONTROL OF MICROORGANISMS
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CONTROL OF
MICROORGANISMSPURPOSE DEFINITION
Activity/action to inhibit, to kill,to eliminate m.o
•To prevent their transmission & the spreading of the disease
•To destroy the pathogenes in the infected host
•To prevent food spoilage
Methods
STERILIZATIONCHEMOTHERAPY
DESINFECTION
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STERILIZATION
1. High temperature
2. Low temperature
3. Desication/ drying up
4. Osmotic pressure
5. Radiation
6.Filtration
Using
PHYSICAL METHODS :
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DESINFECTION
CHEMICAL AGENTS consist of
DISINFECTANT ANTISEPTIC Difference
Concentration D > AS
Character
BAKTERICIDE BACTERIOSTATIC
Effect to the host
TOXIC NON TOXIC used for
MATERIAL ON LIVING TISSUE
Use
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CHEMOTHERAPEUTIC AGENTS
have an selective toxicityThis agents can kill m.o but give less damage in host
• Synthetic Chemical Chemical agent agent Micro organisms product/
Antibiotics
CHEMOTHERAPY
Consist of
Use
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1. High temperature effect kill/destroy microorganisms
Moist heat sterilization Dry heat sterilization
•Free steam sterilization • Dry air heat (1600c,
•Boilling water 2 hours)
OVENCloth sanitation
Eating utensils
• Steam under pressure (t.1210C ,15 pounds) Lab. Instruments, oils,powdere.g
AUTOCLAVE • Burning by fireUse for Use for
Sterilization of. Sterilization of ose, needle,Hospital & Lab.instruments Contaminated
material,cadaver
PHYSICAL METHODS
Consist of
To be used for e.g.
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Autoclave
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2. LOW TEMPERATURE to inhibit the growth of m.o &
(freezing/refrigerator) to inhibit reproduction
to preserve :
Food (meat,vegetables & fruit)
Medicine
Bacteria culture
3. DESICATION effect inhibiting m.o. growth
to be used for : Preservation of foods(meat, vegetables & fruits)
4.OSMOTIC PRESSURE PLASMOLISIS
to be used for : Meat,fish salted
Adding sugar on fruit (candied fruit)
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Freezer & Refrigerator
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5. Radiation effect Baktericidal
>Ultra Violet destroys m.o, depends on
Surgery roomFood industry - micro organisms
- media/culture- time of radiation
X radiation, gamma radiation & ionizing radiation - excellentsterilizing agent
- penetrates deep into objects
* Sterilization of : - surgery equipment which heat sensitive - thick material - others medical equipment (plastic disposable
sup-plies/syranges
Use for
is used for
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6. FILTRATION
> Bacteriological filter thermolabil material: serum, enzymes, vita- mins, antibiotics.
> Air filtration sterilization of iso- lated area to prevent the spreading of the disease
use for
is used for
type
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Filtration dan Laminar air flow
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DISINFECTANTS & ANTISEPTICS
character
BACTERICIDE BACTERIOSTATIC
1. CYTOPLASMIC MEMBRANE DISTURBANCE
Abnormally membrane cell function
Lysis Death
2. PROTEIN SYNTHESIS DISTURBANCE
Protein denaturation
Affected by 6 factors
Concentration,duration of exposure,
Population size, organic matter,acidity (pH) &
temperature
Disturbance of metabolism cell
Mechanism of action
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IDEALLY DISINFECTANTS & ANTISEPTICSIDEALLY DISINFECTANTS & ANTISEPTICS
Effective against a wide variety of Effective against a wide variety of infectious agentinfectious agent
Soluble in waterSoluble in water
Stable in the presence of organic matterStable in the presence of organic matter
Homogen compositionHomogen composition
No toxic to animal/humanNo toxic to animal/human
No corrosive for common materialsNo corrosive for common materials
Highly penetration into microorganismsHighly penetration into microorganisms
Relatively inexpensiveRelatively inexpensive
Effective in environment temperatureEffective in environment temperature
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DISINFECTANTS & ANTISEPTICS GROUP
1. Phenol & Phenolics (Phenol derivates)
Cresols & Lysol Hexachlorophene bacteriostatic
> Mechanism of action = phenol
Denaturated & coagulated protein it depend on consentration
> Effectivity 2 – 5 X of Phenol> High pH & organic matter can reduce antimicrobial activity> Toxic against tissue
Disinfectants in house hold,laboratories & hospitals
character
Use for
Use for
Antiseptic : in oil, cream, soap, solution, Shampo, ointment.
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2. DYE/STAINING AGENTS2. DYE/STAINING AGENTS> Gentian violet> Gentian violet local antiseptic for mucous membrane & local antiseptic for mucous membrane &
skinskin
> Carbol fuchsin> Carbol fuchsin fungal infectionfungal infection
3. HEAVY METALS3. HEAVY METALS BACTERIOSTATIC BACTERIOSTATIC> Mercury : - Mercury chloride > Mercury : - Mercury chloride
- Merbromin/ mercurochrom- Merbromin/ mercurochrom
skin antiseptic skin antiseptic
> Silver> Silver AgNO AgNO3 3
to prevent ophthalmic gonorrheato prevent ophthalmic gonorrhea > Copper> Copper
Use for
digunakan
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4. HALOGENS & HALOGEN COMPOUNDS
*Chlorine gas
odor gas # Calcium hypochlorite & toxic powder for house
# Sodium hypochlorite hold
solution# Chloramine
Combination of Chlorine & Nitrogen
Irrigation of wound
Use for
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* IODINE & IODINE COMPOUND
*Tincture of Iodine skin antiseptic ,
* Betadin for pre operative degerming & for
Crystal, desinfecting in lab. less water soluble & & hospitalsdissolvable in alcohol
5. OXIDANTIA ANTISEPTIC
> Hydrogen peroxida remove anaerobic
> KMnO4 m.o from wound
e.g
Are used as
are used for
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6. REDUCE-SURFACE TENSION AGENT/DETERJENT
Cationic detergents anion detergents
Quaternary ammonium Green soap
compounds
Benzalkonium chloride Skin antiseptic
- Skin antiseptic
- Disinfection of metal or rubber utensils
e.g e.g
Use for
Use for
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7.CHEMOSTERILIZING GASES: colorless gas, toxic,more bactericidal
e.g : Ethylene oxide
Many heat-sensitive items such as: disposable plastic petri dishes syranges, catheters, heart-lung
machinecomponents
8. OTHERS
a. Alcohols 70% Bactericidal
• Skin adstringen reduce sweat• Skin sterilization
• Small instruments sterilization
Use for
Use for
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b. Aldehyde Bactericidal
• Gas: Formaldehyde disinfection of hospital & laboratory equipment
• Solution: Formalin ( contain 40% Formaldehyde )
Tissue preservation
c. Boric acid weak antiseptic agent
• Mouth wash • For skin: powder, ointment
Use for
Use for
Use for
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SYNTHETIC CHEMICAL CHEMICAL SUBSTANCES
AGENTS PRODUCED BY M.O
BACETERIOSTATIC
Bacteriocidal in
high concentration
>Sulfonamides Antibiotics
CHEMOTHERAPEUTIC AGENTS
character
e.ge.g
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*SULF0NAMIDES ANTIBIOTICSCompetitive inhibition 1. Inhibiting cell wall synthesis
Interfere peptidoglycan synthesis
PABA SULFONAMIDES e.g.Penicillins Penicillium
notatum,Gram+Bacitracin Bacillus subtillis, Gram
+
Folic acid
Bacterial growth 2. Agents affecting the permeable of the cell
membrane Polymyxins Bacillus polymyxa,
Gram - Nystatin Streptomyces noursei
*INH ( ISONIAZID) tbc anti fungal
Amphotericin Streptomyces nodosus=pyridoxin anti fungal
Subtitute on
Needed to produce
is used for
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3. AGENTS PRIMARILY INHIBITING PROTEIN SYNTHESIS
BY THEIR EFFECTS ON RIBOSOMES
Chloramphenicol Streptomyces venezuela
Gram + & Gram -
Tetracyclines Streptomyces aureofaciensGram + & Gram -
The Aminoglycocides- Streptomycin Streptomyces griceus
Gram - & Tbc bacillus- Neomycin Streptomyces fradiae
Gram -- Kanamycin Streptomyces kanamycetisus
Gram -- Gentamicin Micromonospora purpurea
Gram + & Gram -
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4. INHIBITION OF NUCLEIC ACID SYNTHESIS
DNA Griseofulvin Pinicillium Griseofulvin
RNA Rifampisin Streptomyces mediterraneiGram + & tbc bacteria
Laboratory exa- Microorganisms drug resistance
mination
• Difusion Resistance factor
inhibition zone
• Dilution MIC(minimal inhibitory concentration)
Problems that usually occur
produce
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RESISTANCE FACTORS
CHROMOSOMAL EXTRA CHROMOSOMAL
(Plasmid or episome)
MUTATION SPREADING
Alteration of Genes/ • Transduction protein component • Transformation
• Conjugation
1. Suitable drug of choice2. Right/enough dosage3. Using combination of antibiotics
location
methods
misal via
To minimize drug resistance
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