A process for producing the L-lysine salt of aztreonam and method for determining the degree of contamination in an amorphous aztreonam lysine salt

摘要

A process for preparing the L-lysine salt of aztreonam, which comprises precipitating aztreonam L-lysine from an aqueous solution of aztreonam L-lysine, wherein the aqueous solution has a pH of not more than 5.5.