Letheen Agar is supplied by Micromaster. It is available in the form of a cream to yellow homogeneous free flowing powder which has a pH in the range of 6.8 to 7.2. It is advisable to store this product below 30C in a tightly closed container.

Quantity provided: 500 g/pack

Letheen Agar is recommended to determine the phenol coefficient of quaternary ammonium compounds using Escherichia coli or Staphylococcus aureus ATCC 6538. Letheen Agar is a modification of Tryptone Glucose Extract Agar with the supplementation of lecithin and Polysorbate 80. This medium is used to neutralize the quaternary ammonium compounds in the testing of germicidal activity. The addition of lecithin and Polysorbate 80 was suggested by Weber and Black. Letheen Medium is also recommended for testing of cosmetics. Beef extract, casein enzymic hydrolysate and dextrose supply essential nutrients and other trace elements for the microbial growth. Lecithin and polysorbate 80 enables the recovery of bacteria from solutions containing residues of disinfectant used in sanitization of utensils and equipments. Lecithin neutralizes quaternary ammonium compounds and polysorbate 80 neutralizes phenolic disinfectants, hexachlorophene and formalin. Dehydrated medium may appear moist with brown sugar appearance, which does not indicate deterioration.