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1、UniversityCode:10225RegisterCode:09440DissertationfortheDegreeofMasterDeterminationofFolicAcidinMilkPowderbySPERPHPLCCandidate:Supervisor:AssociateSupervisor:AcademicDegreeAppliedfor:Speciality:DateofOralExamination:Univ

2、ersity:DanShiAssociateProfYihongBaoProfQinghaiShengMasterFoodScienceandEngineeringNortheastForestryUniversity東北林業(yè)大學(xué)碩士學(xué)位論文AbstractUltrasonicextraction,highchlorineacidsolutiontemoveprotein,solidphaseextractiontechnologypu

3、rificationandHPLCmethodswereappliedfordeterminationoffolioacid(FA)contentinmilkpowderAimedatestablishingarapidandaccuratedeterminationoffolicacidcontentinmilkpowderThroughtheresearchonexperimentalconditions,establishingt

4、hemethodthatdetectthecontentoffolicacidinmilkpowderspecificoperatingprocedureisasfollows:(1)Ssamplepretreatment:59milksamplesweretakenexactly(accurateto00001g)in50mLconicalbeaker;add30mLdeionizedwater(4050。C)dissolve;ult

5、rasonicoscillatorextractionfor15minin50。Ccondition;add60%ofhighchlorineacid15mLfordepositionprotein;afterdepositioncompletelythewholesolutionweremetastasizeto50mLvolumetricflask;adddeionizedwaterforconstantvolumetoscale,

6、shakeequably;centrifugal15minin4000r/mincondition;afterfilter,reservingin04。Crefrigerator(2)Solidphaseextraction:①Uuse5mL100%methanoltoactivateextractioncolumn;add5mLwaterwashingmethanolforbalancecolumn:②Aadd5mLsamplesol

7、utiontothecolumn;usesolid—phaseextractionapparatustocontrolflowvelocityinthe40d/minformakingsamplethroughcolumn;③Afterallsamplesthroughsolid—phaseextractioncolumn,washingoutinterferentwith6mL1%deionizedwash;④Ccollectthee

8、luentwith5mL10t31%methanolanddrywithnitrogen;savebackup(3)Dderivativesmethods:dissolvesamplewithlmLwaterafterdrynitrogenandscrolloscillation;addlmL029/100mLpotassiumpermanganatederivatives,lmL01mol/Lsodiumhydroxideand2mL

9、deionizedwaterandscrolloscillationThenaddwaterheating40minat60℃Rinsewithwater,scrolloscillationanduseorganicfilmfiltrationintotheautofillingbottle,onstandby(4)Cchromatographicdetectionconditions:BDS:HYPERSILC18column(250

10、461Tmlid51xm);Columntemperature30。C;detectorisdetectedwavelength,fluorescencedetector:Em285mnforEx:for437nm;Mobilephasefor01mol/Lsodiumdihydrogenphosphatesolution,Velocity1mL/min,Enterthesampleweight20tLExperimentalresul

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