Poloxamer 181 (L61)

Poloxamer 181 L61 is a block copolymer composed of polyoxyethylene and polyoxypropylene, with an average molecular weight of 2000. It exhibits antimicrobial activity and can inhibit 91% of Mycobacterium avium at a concentration of 1 mg/mL. Poloxamer 181 L61 can form thermoreversible hydrogels and is used as a food additive and as a drug delivery vehicle in cosmetics, pharmaceuticals, and tissue engineering.