20/10/2015 1 Culture Media Preparation. 2 20/10/2015.

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Presentation transcript:

20/10/ Culture Media Preparation

2 20/10/2015

TYPES OF CULTURE MEDIA BASED ON THE AGAR CONCENTRATION (Consistency): 1. Solid media – 2% agar. 2. Liquid media – broth media absence of agar. 3. Semi solid media – % agar

BASIC NUTRITIONAL REQUIREMENTS WATER. CARBON SOURCE. NITROGEN SOURCE. INORGANIC SALTS. Phosphates.Sulfates. Sodium.Potassium. Magnesium.Iron. Manganese.Calcium. BACTERIAL VITAMINS. Thiamineriboflavin nicotinic acidpyridoxine folic acidvitamine B 12.

GASEOUS REQUIREMENTS OXYGEN Obligate aerobes Facultative anaerobes. Microaerophillic. Obligate anaerobes. CARBONDIOXIDE: Capnophillic.

TEMPERATURE Psychrophillic – bacteria that grows at lower temeperature – below 20ºC. Mesophillic – bacteria that grows at 25ºC-40ºC. optimum temp range - 37ºC. Thermophillic – bacteria that grows at high temperatures - 55ºC-80ºC.

CULTURE MEDIA BASIC INGREDIENTS PROTEIN SOURCE – peptone (a complex mixture of partially digested proteins). - special brands – Neopeptone & proteose peptone - digest broths can also be used. - meat extract (Lab Lemco). MINERAL SALT – sodium chloride. WATER- source of hydrogen and oxygen.

Culture Media Preparation 8

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Enriched media Such as blood agar

Culture Media Preparation 12 which is differential for mannitol fermentation Like Staphylococcus aureus change the color of agar from pink to yellow Differential media Mannitol salt agar MacConkey agar which is differential for lactose fermentation Ex: E.coli From non lactose fermenters Ex: salmonella,shigella MacConkey agar Differential media

S ELECTIVE MEDIA Thiosulphate citrate bile salt sucrose (TCBS) which is selective for Vibrio cholerae MacConkey agar which is selective for Enterobacteriaceae TCBS agar

C ULTURE M EDIA Chemically defined media : Exact chemical composition is known Complex media : Extracts and digests of yeasts, meat, or plants Nutrient broth Nutrient agar

SYNTHETIC & SEMISYNTHETIC MEDIUM SYNTHETIC OR DEFINED MEDIUM: Prepared from pure chemical substances and the exact composition of the medium is known. Used for various special studies such as metabolic requirements. EXAMPLE: Dubo’s medium SEMISYNTHETIC OR SEMIDEFINED MEDIUM: Composition is approximately known.

COMPLEX MEDIUM Exact chemical composition of ingredients of culture medium is not known. Widely used for the cultivation of bacteria for diagnostic purposes.

11/28/2010 Culture Media Preparation 19

Culture Media Preparation 20 Blood agar Chocolate agar

Urease medium

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Culture Media Preparation 24

25 Culture Media Preparation

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