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AOACOfficialMethod950.02AnimalFeedPreparationofSampleGrindsampletopasssievewithcircularopenings1mmdiameterandmixthoroughly.Ifsamplecannotbeground,reducetoasfineconditionaspossible.Donotgrindmolassesfeed.AOACOfficialMethod962.09Fiber(Crude)inAnimalFeedandPetFoodCeramicFiberFilterMethodFirstAction1962FinalAction1971RevisedFirstAction1982AOCS-AOACMethodA.PrincipleCrudefiberislossonignitionofdriedresidueremainingafterdigestionofsamplewith1.25%H2SO4and1.25%NaOHsolutionsunderspecificconditions.Methodisapplicabletograins,meals,flours,feeds,fiber-bearingmaterial,andpetfoodsfromwhichfatcanbeextractedtoleaveworkableresidue.B.Reagents(a)Sulfuricacidsolution.----.0255+/-.005N.1.25gH2SO4/100ml.Concentrationmustbecheckedbytitration.(b)Sodiumhydroxidesolution.--0.313+/-0.005N.1.25gNaOH/100ml.free,ornearlyso,fromNa2CO3.Concentrationmustbecheckedbytitration.Preparedceramicfiber.-Place60gceramicfiber(Cerafiber,8lb/cuft,E.J.BartellCo.,700PowellAve.,SW,Renton,WA98055)inblender,add800mlH20,andblend1minatlowspeed.Determineblankbytreatingca2g(dryweight)ofpreparedceramicfiberwithacidandalkaliasindetermination.Correctcrudefiberresultsforanyblank,whichshouldbenegligible(ca2mg).(d)AIcohol.-95%orreagentalcohol,methanol,orisopropanol.(e)Antifoam.-DowCorningCorp.AntifoamAcompounddilutedI+4withmineralspiritsorpetroleumether,orH20-dilutedAntifoamBEmulsion(I+4).DonotuseAntifoamSpray.(f)Bumpingchipsorgranules.-BrokenAlundumcruciblesorequivalentgranules(RRAlundum90mesh,NortonCo.,INewBondSt.,Worcester,MA01606)aresatisfactory.C.Apparatus(a)Digestionapparoius.-Wlthcondensertofit600mlbeaker,andhotplateadjustabletotemperaturethatwillbring200mlH20at25otorollingboilin15+/-2min.(AvailablefromLabconcoCorp.,8811ProspectAve.,KansasCity,MO64132.)(b)Ashingdishes,-Silica,Vitreosil70x16mm;orporcelain,CoorsCeramicsCo.,6009thSt.,Golden,CO80401,No.60230,orequivalent.(c)Desiccator.-Withefficientdesiccantsuchas4-8meshDrierite(CaCI2isnotsatisfactory
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