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PharmaceuticalanalysisDeterminationofpharmiccontentDeterminationofpharmiccontentAuthor:NiuXiaodong---Calculationexamplesfordeterminationofpharmiccontentbytitrimetricanalysis---Calculationexamplesfordeterminationofpharmiccontentbytitrimetricanalysis(I)TitrimetricanalysisContentdeterminationoffurosemideAPITake0.4988g(anhydroussubstance)product,add30mlethylalcohol.Slightlyheatittodissolveitandthencoolit.Add4dropsofcresolredindicatingliquidand1dropofthymolblueindicatingliquid.Titratewithsodiumhydroxidetitranttillthesolutionturnspurplishred.14.86mlsodiumhydroxidetitrant(0.1003mol/L)willbeconsumed;thencalibratetheresultoftitrationbyblanktest.0.05mlsodiumhydroxidetitrant(0.1003mol/L)willbeconsumed.Each1mlsodiumhydroxidetitrant(0.1mol/L)isequalto33.07mgfurosemide.Calculatedasperanhydroussubstance.ThecontentofC12H11ClN2O5Sshouldnotbelessthan99.0%.(I)TitrimetricanalysisContentdeterminationoffurosemideAPITheresultis98.48%<99.0%,sothecontentoftheproductisunqualified.(I)TitrimetricanalysisContentdeterminationofsecobarbitalsodiumAPITake0.1041g(anhydroussubstance)product,putitin250mliodineflask.Add10mlwater.Shaketodissolveit.Add25mlbrominetitrant(0.05mol/L)bypreciseweighing.Add5mlhydrochloricacid.Thensealitimmediatelyandshakeitfor1min.Keepitinadarkplacefor15min.Slightlyopenthecoverandadd10mlpotassiumiodidetestsolution.Thensealitimmediatleywithsodiumthiosulfatetitrant(0.1012mol/L).Addstarchindicatingliquidwhenitapproachestheending.Continuetitrationtillthebluedisappears.Calibratethetitrationresultbyblanktest.Each1ml(0.05mol/L)brominetitrantisequalto13.01mgC12H17N2NaO3.Calculatedasperanhydroussubstance.ThecontentofC12H17N2NaO3shouldnotbelessthan98.5%.Itisgiventhatthesampleconsumes17.20mlsodiumthiosulfatetitrant(0.1012mol/L)andtheblanktestconsumes25.02mlsodiumthiosulfatetitrant(0.1012mol/L).(I)TitrimetricanalysisContentdeterminationofsecobarbitalsodiumAPIThedeterminationresultishigherthan98.5%,sotheproductcontentisqualified.(I)TitrimetricanalysisContentdeterminationoftolbutamidetablet(labelledamount0.5g)Take10tolbutamidetablets.Weighthempreciselyto5.948g.Porphyrizeitandthentake0.5996gtabletpowderbypreciseweighing.Add25mlethanolandslightlyheatittodissolveit.Coolitandadd3dropsofphenolphthaleinindicator.Titratetopinkwithsodiumhydroxidetitrant(0.1008mol/L).Theconsumptionis18.47ml.Each1mlsodiumhydroxidetitrant(0.1mol/L)isequalto27.04mgtolbutamide.ThecurrenteditionofChinesePharmacopoeiastipulatesthatthecontentoftolbutamideintheproductshouldbe95.0%-105%ofthelabelledamount.Trytocalculatethepercentagecompositionoflabelledamountoftheproductandjudgewhetheritmeetstheprovision.(I)TitrimetricanalysisContentdeterminationoftolbutamidetablet(labelledamount0.5g)Theco

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