Letheen Broth is a liquid medium used to determine the antimicrobial activity of quaternary ammonium compounds. It is also used for determining the phenol coefficient of cationic surface-active materials.

AOAC Conforms to AOAC International testing standards.

Principles of Letheen Broth Letheen Broth contains peptone and beef extract which provide the carbon and nitrogen sources necessary for growth. Lecithin and polysorbate 80 are added as surface active disinfectant neutralizing agents.2,5,6 Sodium chloride is included to maintain osmotic balance.

Principles of Letheen Broth, Modified Lecithin, Tween80, and Sodium Bisulfite neutralize quaternary ammonium compounds, phenols, and formalin present in cosmetic products. Meat Peptone, Beef Extract, Yeast Extract, and Enzymatic Digest of Casein provide nitrogenous compounds, carbohydrates, vitamins and minerals. Sodium Chloride maintains osmotic equilibrium.

• BD Difco Letheen Broth Technical Data Sheet
• Alpha Bio Letheen Broth Base Modified Product Information