2023年全國碩士研究生考試考研英語一試題真題(含答案詳解+作文范文)_第1頁
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1、江南大學碩士學位論文脫枝酶的分離純化及酶學性質研究姓名:李由然申請學位級別:碩士專業(yè):發(fā)酵工程指導教師:石貴陽20090601AbstractAbstractBacillusspwasisolatedfromahighwaysoilsampleinQingdaobyresearcherZhaoXianchunofCentreofBiomassResourceofSchoolofBiotechnologyJiangnanUniversit

2、yDuetoitsrelativelyhighStarchDebranchingenzyme(DBE)activitythisstrainCallbeappliedinfactoriesasanewsourcetosynthesisDBEForthepurposeofimprovingtheactivityandstabilityofDBEproducedbythestrainabove,wepurifiedDBEfromBacillu

3、sspandstudieditsbasicpropertiesPurifiedstrainWasinoculatedintoinductionmediumandculturedunder37℃on180rpmshakingtablefor36hThestrainBacillusspCBB272withhighestDBEactivitywaschosenasstartstrainaftersecondaryscreeningRejuve

4、natethestrain272byaserialpassagestilltheactivityreachedastablelevelAfter11passages,theDBEactivityincreasedby128timesPreparingcrudeenzymein15LcomputercontrolledfermentorPurifiedstrainoftwostepculturing,lasting24hand12hres

5、pectively,Wasaddedinto9Lmediumwithaninoculationamountof10%After36hfermentationat37“C,the9LproductWasconcentratedto16LcrudeenzymewithaproteinamOuntof13mg/mLbycentrifugeandultrafiltrationThetargetproteinWasprecipitationbet

6、ween30%80%ammoniumsulfatesaturationandthesedimentwasredissolvedin20mMTrisHCIbuffer(pH82)TheproteinsolutionWasrunthroughSephacrylS100gelfiltration,DEAEFFionexchangecolumeandMonoQionexchangecolumnThefinalproteinsolutionWas

7、verifiedonSDSPAGEwithoneband,whichprovedthattheenzymeWaspurifiedtohomogeneityTheproteinconcentrationandDBEactivityweremeasuredaftereachstepofpurificationandthespecificactivityfoldandyieldofeachstepWascalculatedIntheend,a

8、36921foldpurification州thayieldof192%WasobtainedProteinconcentrationWasmeasuredintermsofBradfordmethodusingBSAasthestandard;DBEactivityWasmeasuredbyIodinemethodThebasicpropertiesofDBEWasstudied111emaximalactivityoccurreda

9、t70“12andpH60ItWasstableatatemperaturebetween30℃and70℃andretainedatleast70%originalactivityfor60mininthepHrangefrom45—90AtpH60and50“Cthe‰for支鏈淀粉Was40324mg/mLandthegmaxWasO1841mg/(minmLdebranchingenzyme)TleenzymeWasactiva

10、tedstronglybyCa2,M92andMn2(upto14131%),whatismore,C一,Wasshowntobeanexcellentprotectoroftheenzymeatatemperatureupto80℃ThehomogenousStarchDebranchingEnzymeanditsbasicpropertieswereobtainedthroughthisstudywhichlaidafoundati

11、onforthefuturestudyofDBEaminoacidsequenceandtherelationshipofDBEstructure&functionAccordinglywecanincreasetheoutputandqualityofDBEbymodifyingtheenzymetoenhanceitsactivityandstabilityKeywords:StarchDebranchingEnzyme;Bacil

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