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Principle
- Letheen agar modified is composed of peptone, meat extract (the equivalent of beef extract), tryptone, yeast extract, sodium chloride, dextrose, polysorbate 80, lecithin, sodium bisulfite, and agar.
- Peptone, Meat extract, yeast extract, and tryptone provide nitrogenous and carbonaceous compounds, long-chain amino acids, vitamins, and trace elements for the growth of microorganisms. Sodium chloride maintains osmatic equilibrium. Dextrose is a carbon source.
- The lecithin and polysorbate 80 aid the recovery of bacteria from materials containing residues of disinfectants or preservatives used in cosmetics. Polysorbate 80 and lecithin nullify phenolic compounds, hexachlorophene, and formalin and neutralize ethyl alcohol.
- Lecithin also neutralizes quaternary ammonium compounds present in cosmetics. Sodium bisulfite enhances the growth of microorganisms and neutralizes the preservative.
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