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Tryptone Soy Broth (TSB)
Tryptone-Soy Broth is a universal nutrient medium suitable for a wide range of uses.
In light of its excellent nutritive value, it favors the growth of most fastidious microorganisms.
It is used in the pharmaceutical industry to satisfy sterility tests and its formula is that listed in the United States Pharmacopoeia for specific and non-specific germs.
It responds also to the formulations described in quality control norms established for cosmetic products, as well as in animal health.
Available in 500g package.
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.
