美国药典注射液各论配制供试品溶液常看到 Assay preparation 1 (where it is represented as being in a single-dose container) Assay preparation 2 (where the label states the quantity of ampicillin in a given volume of constituted solution)
例如注射用氨苄西林 Assay preparation 1 (where it is represented as being in a single-dose container)—Constitute Ampicillin for Injection in an accurately measured volume of Diluent, corresponding to the volume of solvent specified in the labeling. Withdraw all of the withdrawable contents, using a suitable hypodermic needle and syringe, and quantitatively dilute with Diluent to obtain a solution containing about 1 mg of ampicillin per mL. Use this solution promptly after preparation.
Assay preparation 2 (where the label states the quantity of ampicillin in a given volume of constituted solution)—Constitute 1 container of Ampicillin for Injection in a volume of Diluent, accurately measured, corresponding to the volume of solvent specified in the labeling. Quantitatively dilute an accurately measured portion of the constituted solution with Diluent to obtain a solution having a concentration of about 1 mg of ampicillin per mL. Use this solution promptly after preparation.
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