High grade Letheen Broth AOAC* is supplied by Micromaster. It is available in the form of a cream to yellow homogenous 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.

• Quantity provided: 500 g/pack

Letheen Broth, AOAC is recommended for determination of bactericidal activity of quaternary ammonium compounds using Escherichia coli or Staphylococcus aureus (ATCC 6538). Letheen Broth was developed by Quisno, Gibby and Foter by the addition of lecithin and Polysorbate 80 to FDA Broth. Letheen Broth is recommended by AOAC to determine the phenol coefficient of cationic surfactants. Letheen Medium is also recommended for testing of cosmetics. Beef extract, casein enzymic hydrolysate, 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.