USP 88 生物实验文档格式.docx
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Thesethreetestsareappliedtomaterialsormedicaldevices,ifthereisaneedforclassificationofplasticsandotherpolymersbasedoninvivobiologicalreactivitytesting.
Forthepurposeofthischapter,thesedefinitionsapply:
theSampleisthespecimenundertestoranextractpreparedfromsuchaspecimen.ABlankconsistsofthesamequantityofthesameextractingmediumthatisusedfortheextractionofthespecimenundertest,treatedinthesamemannerastheextractingmediumcontainingthespecimenundertest.ANegativeControl1isaspecimenthatgivesnoreactionundertheconditionsofthetest.
CLASSIFICATIONOFPLASTICS
SixPlasticClassesaredefined(seeTable1).Thisclassificationisbasedonresponsestoaseriesofinvivotestsforwhichextracts,materials,androutesofadministrationarespecified.Thesetestsaredirectlyrelatedtotheintendedend-useoftheplasticarticles.Thechoiceofextractantsisrepresentativeofthevehiclesinpreparationswithwhichtheplasticsarelikelytobeincontact.TheTable1classificationfacilitatescommunicationamongsuppliers,users,andmanufacturersofplasticsbysummarizingtheteststobeperformedforcontainersforinjectionsandmedicaldevicesifaneedforclassificationexists.
Table1.ClassificationofPlastics
PlasticClassesa
TeststobeConducted
I
II
III
IV
V
VI
TestMaterial
Animal
Dose
Procedureb
x
ExtractofSampleinSodiumChlorideInjection
Mouse
50mL/kg
A(IV)
RabbitorGuineaPig
mL/animal
ateachof10or6sites
B(IC)
ExtractofSamplein1in20SolutionofAlcoholinSodiumChlorideInjection
A(IP)
ExtractofSampleinPolyethyleneGlycol400
10g/kg
ExtractofSampleinVegetableOil
B(IC)
ImplantstripsofSample
Rabbit
4strips/animal
C
ImplantSample
Rat
2Samples/animal
C
a
Testsrequiredforeachclassareindicatedby“x”inappropriatecolumns.
b
Legend:
A(IP)—SystemicInjectionTest(intraperitoneal);
B(IC)—IntracutaneousTest(intracutaneous);
C—ImplantationTest(intramuscularorsubcutaneousimplantation).
WiththeexceptionoftheImplantationTest,theproceduresarebasedontheuseofextractsthat,dependingontheheatresistanceofthematerial,arepreparedatoneofthreestandardtemperatures:
50
70
and121
.Therefore,theclassdesignationofaplasticmustbeaccompaniedbyanindicationofthetemperatureofextraction.,IV-121
whichrepresentsaclassIVplasticextractedat121
orI-50
whichrepresentsaclassIplasticextractedat50
).
PlasticsmaybeclassifiedasUSPPlasticClassesI–VIonlyonthebasisoftheresponsecriteriaprescribedinTable1.
Thisclassificationdoesnotapplytoplasticsthatareintendedforuseascontainersfororalortopicalproducts,orthatmaybeusedasanintegralpartofadrugformulation.Table1doesnotapplytonaturalelastomers,whicharetobetestedinSodiumChlorideInjectionandvegetableoilsonly.
TheSystemicInjectionTestandtheIntracutaneousTestaredesignedtodeterminethesystemicandlocal,respectively,biologicalresponsesofanimalstoplasticsandotherpolymersbythesingle-doseinjecti