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Agar-agar, usually seen abbreviated as agar, is a gelatinous substance derived from certain types of red algae, or seaweed. There are a number of uses for it, although most people are familiar with it as the culture medium in petri dishes.gar is derived from certain types of red algae. Agar and bacteria in a petri dish. Agar has a number of uses in the fields of microbiology and chemistry. Agar is used to make gelatinous foods like gummy bears.
Characteristics of the components used in nutrient agar/broth. 1  Beef extract is an aqueous extract of lean beef tissues. 2  Peptone is made by digesting proteinaceous materials e.g., meat, casein, gelatin, using acids or enzymes. 3  Agar is a complex carbohydrate obtained from certain marine algae. It is used as a solidifying agent for media and does not have any nutritive value. Agar gels when the temperature of media reaches 45Â°C and melts when the temperature reaches 95 Â°C. Preparation of Nutrient Agar