Fosinopril Sodium
l-Proline, 4-cyclohexyl-1-[[[2-methyl-1-(1-oxopropoxy)propoxy](4-phenylbutyl)phosphinyl]acetyl]-, sodium salt, [1[S*(R*)],2 ![]() ![]() (4S)-4-Cyclohexyl-1-[(R)-[(S)-1-hydroxy-2-methylpropoxy](4-phenylbutyl)phosphinyl]acetyl-l-proline propionate (ester), sodium salt ![]() ![]() ![]() » Fosinopril Sodium contains not less than 97.5 percent and not more than 102.0 percent of C30H45NNaO7P, calculated on the anhydrous basis.
Packaging and storage
Preserve in tight containers, and store at controlled room temperature.
USP Reference standards
![]() ![]() USP Fosinopril Sodium RS ![]() USP Fosinopril Related Compound A RS ![]() USP Fosinopril Related Compound B RS ![]() USP Fosinopril Related Compound C RS ![]() USP Fosinopril Related Compound D RS ![]() USP Fosinopril Related Compound E RS ![]() USP Fosinopril Related Compound F RS ![]()
Identification,
Infrared Absorption
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Water, Method I
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Heavy metals, Method II
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Related compounds
test 1
Mobile phase and Chromatographic system
Proceed as directed in the Assay.
System suitability solution
Transfer about 10 mg of USP Fosinopril Sodium RS, and about 1 mg each of USP Fosinopril Related Compound A RS and USP Fosinopril Related Compound B RS to a 100-mL volumetric flask. Dissolve in and dilute with Mobile phase to volume, and mix.
Test solution
Use the Assay preparation.
Procedure
Proceed as directed in the Assay, and measure the areas for each component in the chromatogram obtained, carrying out the chromatography to four times the retention time of the fosinopril sodium peak. Calculate the percentage of each individual related compound by the formula:
100(ri / rs)
in which ri is the response of any individual peak, other than the fosinopril sodium peak; and rs is the sum of the responses of all the peaks. [noteIf present, two more diastereomers may not be resolved from fosinopril related compound B by this method. These peaks, appearing at a relative retention time of 0.7, should be integrated together to determine conformance with the limit in Table 1.]
Table 1
test 2
Mobile phase
Prepare a degassed mixture of acetonitrile, water, and phosphoric acid (4000:15:2). Make adjustments if necessary (see System Suitability under Chromatography
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Standard solution
Use the Standard preparation, prepared as directed in the Assay.
Resolution solution
Transfer about 1 mg each of USP Fosinopril Sodium RS, USP Fosinopril Related Compound C RS, and USP Fosinopril Related Compound D RS to a 100-mL volumetric flask. Dissolve in and dilute with the Standard solution to volume, and mix.
Test solution
Use the Assay preparation.
Chromatographic system (see Chromatography
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Procedure
Inject about 20 µL of the Test solution into the chromatograph, record the chromatogram, and measure the peak areas, carrying out the chromatography to two times the retention time of the fosinopril sodium peak. Calculate the percentages of fosinopril related compound C and fosinopril related compound D only by the formula:
100(ri / rs)
in which ri is the peak response of fosinopril related compound C or fosinopril related compound D; and rs is the sum of the responses of all the peaks.
test 3
0.2% Phosphoric acid solution
Prepare a 1 in 500 solution of phosphoric acid.
Mobile phase
Prepare a degassed mixture of acetonitrile and 0.2% Phosphoric acid solution (560:440). Make adjustments if necessary (see System Suitability under Chromatography
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Resolution solution
Transfer about 1 mg each of USP Fosinopril Sodium RS, USP Fosinopril Related Compound E RS, and USP Fosinopril Related Compound F RS to a 100-mL volumetric flask. Dissolve in and dilute with Mobile phase to volume, and mix.
Test solution
Transfer about 10 mg of Fosinopril Sodium, accurately weighed, to a 50-mL volumetric flask. Dissolve in and dilute with Mobile phase to volume, and mix.
Chromatographic system (see Chromatography
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Procedure
Inject about 20 µL of the Test solution into the chromatograph, record the chromatogram, and measure the peak areas, carrying out the chromatography to four times the retention time of the fosinopril sodium peak. Calculate the percentages of fosinopril related compound E and fosinopril related compound F only, using the formula below:
100(ri / rs)
in which ri is the peak response of fosinopril related compound E or fosinopril related compound F; and rs is the sum of the responses of all the peaks. In addition to not exceeding the limits for impurities in Table 1, not more than 0.1% of any other individual impurity is found (calculated as directed for the Procedure in Test 1); and not more than 1.5% of total impurities is found.
Assay
Mobile phase
Prepare a degassed mixture of acetonitrile, water, and phosphoric acid (2000:10:1). Make adjustments if necessary (see System Suitability under Chromatography
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System suitability solution
Transfer about 10 mg of USP Fosinopril Sodium RS, and about 1 mg of USP Fosinopril Related Compound B RS to a 100-mL volumetric flask. Dissolve in and dilute with Mobile phase to volume, and mix.
Standard preparation
Dissolve an accurately weighed quantity of USP Fosinopril Sodium RS in Mobile phase to obtain a solution having a known concentration of about 0.10 mg per mL.
Assay preparation
Transfer about 25 mg of Fosinopril Sodium, accurately weighed, to a 250-mL volumetric flask. Dissolve in and dilute with Mobile phase to volume, and mix.
Chromatographic system (see Chromatography
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Procedure
Separately inject equal volumes (about 20 µL) of the Standard preparation and the Assay preparation into the chromatograph, record the chromatograms, and measure the responses for the major peaks. Calculate the amount, in mg, of C30H45NNaO7P in the portion of Fosinopril Sodium taken by the formula:
250CS (rU / rS)
in which CS is the concentration, in mg per mL, of USP Fosinopril Sodium RS in the Standard preparation; and rU and rS are the peak responses obtained from the Assay preparation and the Standard preparation, respectively.
Auxiliary Information
Please check for your question in the FAQs before contacting USP.
Chromatographic Column
USP32NF27 Page 2449
Pharmacopeial Forum: Volume No. 34(3) Page 613
Chromatographic columns text is not derived from, and not part of, USP 32 or NF 27.
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