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• Intended Use: Letheen Agar with Tween is used 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 with Tween is a modification of TGE Agar, with the addition of Lecithin and Tween 80 (Polysorbate 80).
Letheen Agar with Tween 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.
Letheen Agar with Tween has incorporated Tween 80 (Polysorbate 80) into the medium, this is the only difference from Letheen Agar Base.
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Spectrum Chemical Mfg. Corp. offers a flat fee shipping when items are shipped “directly from Spectrum warehouses” by regular UPS ground within the contiguous United States. There are some additional charges that are item specific. Not included are any expedited or LTL shipments or dIrect shipped items from Spectrum vendors or manufacturers which are charged at published carrier rates.
|Order Sub-Total||Shipping Charge|
|$0 - <$299.99||$19.25|
|$300 - <$499.99||$32.50|
|$500 - <$999.99||$44.75|
|Additional Charge Items||Shipping Charge|
|Hazard Charge - Ground||$33.00 per box|
|Hazard Charge - Air||$46.50 per box|
|Poison Pack Charge (Small)||$15.00 per box|
|Poison Pack Charge (Large)||$25.00 per box|
|Ice Pack Charge (Small)||$10.00 per box|
|Ice Pack Charge (Large)||$15.00 per box|
|Pallet Charge (Wood Pallet)||$25.00 per box|
|Pallet Charge (Plastic Pallet)||$40.00 per box|
|Fuel Surcharge (<$400 subtotal)||$5.85|
|Fuel Surcharge (>$400 subtotal)||$10.55|
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