acumedia* Letheen Agar Base

• Intended Use: Letheen Agar Base is used with Tween 80 (Polysorbate 80) for the testing of quaternary ammonium compounds for antimicrobial activity.
• Product Summary and Explanation: In 1948, Weber and Black described the value of a highly nutritional solid medium containing neutralizing agents for quaternary ammonium compounds in sanitizers. The addition of Lecithin and Tween 80 (Polysorbate 80) to Tryptone Glucose Extract (TGE) Agar resulted in a medium that effectively neutralizes quaternary ammonium compounds while testing germicidal activity. Letheen Agar Base is a modification of TGE Agar, with the addition of Lecithin and Tween 80 (Polysorbate 80).
Letheen Agar Base is specified for use by the American Society for Testing Materials (ASTM) in Standard Test Method for Preservatives in Water-Containing Cosmetics. Total neutralization of disinfectants is critical. Disinfectant residues can result in a false negative (no-growth) test.
Image(s) are representative of the product group and not necessarily the individual product.