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Characteristics of Several Complex Materials Used as Ingredients of Media

Nisha S.
23 Sep 0 0
Raw Material Characteristics Nutritional Value
Beef Extract An aqueous extract of lean beef tissue concentrated to a paste Contains the water-soluble substances of animal tissue, which include carbohydrates, organic nitrogen compounds, water-soluble vitamins, and salts.
Peptone The product resulting from the digestion of proteinaceous materials, e.g., meat, casein, and gelati; digestion of the protein matetrial is accomplished with acids or enzymes; many different peptones (depending upon the protein used and the mmethod of digestion) are available for use in bacteriological media; peptones differ in their ability to support growth of bacteria.  Principal source of organic nitrogen; may also contain some vitamins and sometimes carbohydrates, depending upon the kind of proteinaceous material digested.
Agar A complex carbohydrate obtained from certain marine algae; processed to remove extraneous substances Used as a solidification  agent for media, agar, dissolved in aqueous solutions, gels when the temperature is reduced below 45 degrees; agar not considered a source of nutrient to the bacteria.
Yeast Extract An aqueous extract of yeast cells, commerially available as a powder A very rich source of the B vitamins; also contains organic nitrogen and carbon compounds.
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