A: It meets the requirements under Identification—Organic Nitrogenous Bases á181ñ.

B: It meets the requirements of the tests for Chloride á191ñ.

Ion-pair solution,Mobile phase,andBenzaldehyde solution —Proceed as directed in the Assay.

Chromatographic system —Proceed as directed in the Assay.To evaluate system suitability requirements,use the System suitability preparationand the Standard preparation,as prepared in the Assay.

Test solution— Use the Assay preparation.

Procedure— Inject a volume (about 10µL)of the Test solutioninto the chromatograph,record the chromatogram,and measure all of the peak responses.Calculate the percentage of each impurity in the portion of Tripelennamine Hydrochloride taken by the formula: in which riis the peak response for each impurity;and rSis the sum of the responses for all the peaks:not more than 0.1%of any individual impurity is found;and not more than 1.0%of total impurities is found.

Ion-pair solution— Prepare a 29mMsodium 1-octanesulfonate solution.

Mobile phase— Transfer 530mLof methanol to a suitable container,add 1.0mLof N,N-dimethyloctylamine,and mix thoroughly.Add 430mLof the Ion-pair solution,mix,and adjust with phosphoric acid to a pHof 3.0.Make adjustments if necessary (see System Suitabilityunder Chromatography á621ñ).

Benzaldehyde solution— Transfer 1.0mLof benzaldehyde to a 100-mLvolumetric flask,dilute with Mobile phaseto volume,and mix.Transfer 5.0mLof the solution so obtained to a 100-mLvolumetric flask,dilute with Mobile phaseto volume,and mix.

System suitability preparation— Transfer about 50mg of 2-benzylaminopyridine,accurately weighed,to a 100-mLvolumetric flask,add 10mLof methanol,sonicate to dissolve,dilute with Mobile phaseto volume,and mix.Transfer 5.0mLof the solution so obtained to a 100-mLvolumetric flask,add 5.0mLof Benzaldehyde solution,dilute with Mobile phaseto volume,and mix.

Standard preparation— Dissolve an accurately weighed quantity of USP Tripelennamine Hydrochloride RSin Mobile phase,and dilute quantitatively,and stepwise if necessary,with Mobile phaseto obtain a solution having a known concentration of about 0.5mg per mL.

Assay preparation— Transfer about 50mg of Tripelennamine Hydrochloride,accurately weighed,to a 100-mLvolumetric flask,dissolve in and dilute with Mobile phaseto volume,and mix.

Chromatographic system (see Chromatography á621ñ)—The liquid chromatograph is equipped with a 242-nm detector and a 4.6-mm ×25-cm column that contains packing L7.The flow rate is about 1mLper minute.The column temperature is maintained at 35.[NOTE—New columns are conditioned with Mobile phase overnight before the initial use and may be reconditioned,as necessary,thereafter.]Chromatograph the System suitability preparation,and record the peak responses as directed for Procedure:the relative retention times are about 0.75for benzaldehyde and 1.0for 2-benzylaminopyridine;and the resolution,R,between benzaldehyde and 2-benzylaminopyridine is not less than 3.5.Chromatograph the Standard preparation,and record the peak responses as directed for Procedure:the column efficiency is not less than 10,000theoretical plates;and the relative standard deviation for replicate injections is not more than 1.0%.

Procedure— Separately inject equal volumes (about 10µL)of the Standard preparationand the Assay preparationinto the chromatograph,record the chromatograms,and measure the responses for the major peaks.Calculate the quantity,in mg,of C16H21N3·HCl in the portion of Tripelennamine Hydrochloride taken by the formula: in which Cis the concentration,in mg per mL,of USP Tripelennamine Hydrochloride RSin the Standard preparation;and rUand rSare the peak responses obtained from the Assay preparationand the Standard preparation,respectively.