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Bacteriological Agar Type E
Bacteriological agars act as solidification agents in the preparation of solid culture media at concentrations between 12 and 20 g / L.
Choose between both dehydrated mediums : 500g or 5Kg container
Agars are extracts of marine algae that has been purified and dried. The extraction in an acid solution is followed by successive purifications in order to obtain clear gels, devoid of precipitates after sterilization and exempt from inhibitory substances.
Agar is comprised essentially of agaraose (70 %) and of agaropectin (30 %) which form together a solid gel after heating and cooling.
Agarose is a linear polysaccharide entirely comprised of D-galactose and of 3-6 anhydro-L-galactose linked at alpha 1-3 and beta 1-4.
Agaropectin, which the structure is similar to that of agarose, also contains groups of anionic esters linked to calcium and to magnesium as well as organic acids (glucuronic and pyruvic).
The 3-6 anhydro-α-L-galactoside link is very sensitive at low pH, so much so that it is necessary to avoid prolonged heating of acid media, which could lead to the depolymerization of the agar and consequently a loss of gel strength. Bacteriological agar type E is a European type agar which presents a gel strength superior to that of the type A American agar.
