Add the following:
Arginine Tablets
» Arginine Tablets contain not less than 90.0 percent and not more than 110.0 percent of the labeled amount of arginine or arginine hydrochloride in an amount equivalent to C6H14N4O2.
Packaging and storage— Preserve in tight, light-resistant containers.
Labeling— The label states the form of the arginine that is used and the equivalent amount of C6H14N4O2.
A: Thin-Layer Chromatographic Identification Test 201
Test solution— Transfer a portion of finely powdered Tablets, equivalent to about 150 mg of arginine, to a 100-mL volumetric flask. Dissolve in water, and then sonicate for 15 minutes. Dilute with water to volume, mix, and filter.
Standard solution— Dissolve an accurately weighed quantity of USP l-Arginine RS or USP Arginine Hydrochloride RS in water to obtain a solution having a known concentration of about 1.5 mg per mL.
Application volume: 5 µL.
Developing solvent system— Prepare a mixture of isopropyl alcohol and ammonium hydroxide (70:30).
Spray reagent— Dissolve 0.2 g of ninhydrin in 100 mL of a mixture of butyl alcohol and 2 N acetic acid (95:5).
Procedure— Proceed as directed for Thin-Layer Chromatography under Chromatography 621. Dry the plate between 100 and 105 until the ammonia disappears completely. Spray with Spray reagent, and heat between 100 and 105 for about 15 minutes. Examine the plate under white light. The principal spot from the Test solution corresponds in appearance and RF value to that of the Standard Solution.
B: The retention time of the major peak in the chromatogram of the Assay preparation corresponds to that in the chromatogram of the Standard preparation, as obtained in the Assay.
Dissolution 2040
Medium: 0.1 N hydrochloric acid; 900 mL.
Apparatus 2: 75 rpm.
Time: 60 minutes.
Procedure— Determine the amount of C6H14N4O2 dissolved by employing the procedure set forth in the Assay, making any necessary modifications.
Tolerances— Not less than 75% of the labeled amount of C6H14N4O2 is dissolved in 60 minutes.
Weight variation 2091: meet the requirements.
Phosphate buffer, 2.3 mM 1-Octanesulfonic acid sodium salt solution, Mobile phase, Standard preparation, and Chromatographic system— Proceed as directed in the Assay under Arginine Capsules.
Assay preparation— Weigh and finely powder not fewer than 20 Tablets. Transfer an accurately weighed portion of the powder, equivalent to about 150 mg of arginine, into a 100-mL volumetric flask. Add about 80 mL of Phosphate buffer, and then sonicate for 15 minutes. Dilute with Phosphate buffer to volume, and mix.
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 arginine (C6H14N4O2) in the portion of Tablets taken by the formula:
100C(rU / rS)
in which C is the concentration, in mg per mL, of USP l-Arginine RS or USP Arginine Hydrochloride RS in the Standard preparation; and rU and rS are the peak responses obtained from the Assay preparation and the Standard preparation, respectively.USP32
Auxiliary Information— Please check for your question in the FAQs before contacting USP.
Topic/Question Contact Expert Committee
Monograph Curtis Phinney

(DSN05) Dietary Supplements - Non-Botanicals
Reference Standards Lili Wang, Technical Services Scientist
USP32–NF27 Page 963
Pharmacopeial Forum: Volume No. 33(6) Page 1161
Chromatographic Column—
Chromatographic columns text is not derived from, and not part of, USP 32 or NF 27.