Metaproterenol Sulfate
1,3-Benzenediol, 5-[1-hydroxy-2-(1-methylethyl)amino]ethyl-, (±)-, sulfate (2:1) (salt). (±)-3,5-Dihydroxy- ![]() ![]() ![]() ![]() » Metaproterenol Sulfate contains not less than 98.0 percent and not more than 102.0 percent of (C11H17NO3)2·H2SO4, calculated on the anhydrous, isopropyl alcohol-free, and methanol-free basis.
Packaging and storage
Preserve in tight, light-resistant containers.
Identification
B:
To a solution of 10 mg in 1 mL of water add 1 drop of ferric chloride TS: a violet color is produced.
C:
It responds to the tests for Sulfate
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pH
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Water, Method I
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Residue on ignition
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Heavy metals, Method II
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Iron
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Limit of metaproterenone sulfate
Its absorptivity (see Spectrophotometry and Light-Scattering
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Isopropyl alcohol and methanol
Isopropyl alcohol standard solution
Transfer about 0.3 g of isopropyl alcohol, accurately weighed, to a 100-mL volumetric flask containing about 10 mL of water, dilute with water to volume, and mix. Pipet 10 mL of the resulting solution into a 100-mL volumetric flask, add about 85 mL of pyridine, mix, and allow to stand for 1 hour. Dilute with pyridine to volume, and mix. Pipet 5 mL of this solution to a 50-mL volumetric flask, dilute with pyridine to volume, and mix. The solution so obtained contains about 30 µg of isopropyl alcohol per mL.
Methanol standard solution
Prepare as directed for Isopropyl alcohol standard solution, using about 0.1 g of methanol, accurately weighed. The resulting solution contains about 10 µg of methanol per mL.
Test preparation
Transfer about 1 g of Metaproterenol Sulfate, accurately weighed, to a 100-mL volumetric flask, dissolve in about 2 mL of water, dilute with pyridine to volume, and mix.
Chromatographic system
The gas chromatograph is equipped with a flame-ionization detector and contains a 2-m × 2-mm column packed with 0.1% liquid phase G25 on 80- to 100-mesh support S7. The injection port is maintained at a temperature of about 150
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Procedure
Inject equal volumes (about 2 µL) of the Test preparation, the Isopropyl alcohol standard solution, and the Methanol standard solution successively into the gas chromatograph. Measure the responses of the isopropyl alcohol peak and the methanol peak in each chromatogram. Determine the quantities, in mg, of isopropyl alcohol and methanol in the portion of Metaproterenol Sulfate taken by the formula:
0.1C(rU / rS)
in which C is the concentration, in µg per mL, of isopropyl alcohol or methanol in the Isopropyl alcohol standard solution or the Methanol standard solution; and rU and rS are the responses of the respective analytes in the Test preparation and of the corresponding Isopropyl alcohol standard solution or Methanol standard solution: not more than 0.3% of isopropyl alcohol and not more than 0.1% of methanol are found.
Assay
Mobile phase
Dissolve 11.9 g of anhydrous dibasic sodium phosphate in water to make 1000 mL of solution, and mix (Solution A). Dissolve 9.1 g of monobasic potassium phosphate in water to make 1000 mL of solution, and mix (Solution B). Mix 735 mL of Solution A and 140 mL of Solution B, add 125 mL of methanol, and mix. Filter and degas this solution before use.
Standard preparation
Dissolve an accurately weighed quantity of USP Metaproterenol Sulfate RS in 0.01 N hydrochloric acid to obtain a solution having a known concentration of about 2 mg per mL.
Assay preparation
Transfer about 100 mg of Metaproterenol Sulfate, accurately weighed, to a 50-mL volumetric flask, dilute with 0.01 N hydrochloric acid to volume, and mix.
Chromatographic system
(see Chromatography
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Procedure
Separately inject equal volumes (about 10 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 quantity, in mg, of (C11H17NO3)2·H2SO4 in the portion of Metaproterenol Sulfate taken by the formula:
50C(rU / rS)
in which C is the concentration, in mg per mL, of USP Metaproterenol Sulfate RS in the Standard preparation, and rU and rS are the peak responses 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 2901
Chromatographic columns text is not derived from, and not part of, USP 32 or NF 27.
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