醋酸纤维素美国药典标准.docx

文档介绍：▲,diacetate[9035-69-2].Cellulose,triacetate[9012-09-3].»pletelyacetylatedcellulose」,byweight,ofacetyl(C2H3O)groups,calculatedonthedriedbasis」・。%〜%,%〜%。Packagingandstorage——〈11〉一USPCellulose/—PrepareasolutionofCelluloseAcetate(1in10),previouslydried,,placeasecondsodiumchlorideplateoverit,,heatthembothat105Qfor1hour,andreassemblethedriedplates:theIRabsorptionspectrumexhibitsmaximaonlyatthesamewaveIengthsasthatofasimilarpreparationofUSPCelluloseAcetateffS,〈731〉—Dryitat105Qfor3hours:%ofitsweight・干燥失重一一在105°%,Residueoniqnition〈281〉:%.炽灼残渣Heavvmetals,/Vtef/?od//〈231〉:%.重金屈10ppmFreeacid—Transferabout5g,accuratelyweighed,toa250-,cooledwater,insertthestopperintotheflask,swirlthesuspensiongently,,andwashtheflaskandthefilte