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process for the production of sterile, practically crystalline cephalothinnatrium, cephaloridinbetain or cefazolinnatrium
process for the production of sterile, practically crystalline cephalothinnatrium, cephaloridinbetain or cefazolinnatrium
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机译:无菌,几乎结晶的头孢菌素,头孢菌素或头孢唑啉钠的生产方法
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摘要
Sterile, essentially crystalline cephalosporins for parenteral administration are prepared by a freeze-drying process wherein, after rapidly cooling a solution of such cephalosporins to at least -15° C. in no more than 3 hours, the frozen solution is held between about 0° C. and about -10° C. until the nucleation of the cephalosporin is substantially complete before subjecting said frozen solution to a high vacuum and a moderate amount of heat to sublime the water therefrom.
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