Ampicillin Soluble Powder
» Ampicillin Soluble Powder is a dry mixture of Ampicillin (as the trihydrate) and one or more suitable diluents and stabilizing agents. It contains not less than 90.0 percent and not more than 120.0 percent of the labeled amount of ampicillin (C16H19N3O4S).
Packaging and storage—
Preserve in tight containers.
Labeling—
Label it to indicate that it is for veterinary use only.
USP Reference standards 
11
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11—
USP Ampicillin RS 
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Identification—
Dissolve a quantity of it in a mixture of acetone and 0.1 N hydrochloric acid (4:1) to obtain a solution containing 10 mg of ampicillin per mL: the resulting solution responds to the Identification test under Ampicillin Capsules.
pH 791:
between 3.5 and 6.0, in an aqueous solution containing the equivalent of 20 mg of ampicillin per mL.
791:
between 3.5 and 6.0, in an aqueous solution containing the equivalent of 20 mg of ampicillin per mL.
Water, Method I 921:
not more than 5.0%.
921:
not more than 5.0%.
Assay—
Standard preparation—
Prepare as directed for Standard Preparation under Iodometric Assay—Antibiotics 425, using USP Ampicillin RS.
425, using USP Ampicillin RS.
Assay preparation—
Transfer an accurately weighed quantity of Soluble Powder, equivalent to about 125 mg of ampicillin, to a 100-mL volumetric flask, dissolve in and dilute with water to volume, and mix.
Procedure—
Proceed as directed for Procedure under Iodometric Assay—Antibiotics 425. Calculate the quantity, in mg, of ampicillin (C16H19N3O4S) in the portion of Soluble Powder taken by the formula:
425. Calculate the quantity, in mg, of ampicillin (C16H19N3O4S) in the portion of Soluble Powder taken by the formula:
(F / 20)(B 
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Auxiliary Information—
Please check for your question in the FAQs before contacting USP.
| Topic/Question | Contact | Expert Committee |
|---|---|---|
| Monograph | Morgan Puderbaugh, B.S.
Associate Scientific Liaison 1-301-998-6833 |
(SM32010) Monographs - Small Molecules 3 |
| Reference Standards | RS Technical Services 1-301-816-8129 rstech@usp.org |
USP35–NF30 Page 2211