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商品描述
HighpuritydyedandcrosslinkedChitozymetabletsforthemeasurementofenzymeactivity,forresearch,biochemicalenzymeassaysandinvitrodiagnosticanalysis.
Substrateforthesemi-quantitativeassayofchitosanase.
Newchromogenicsubstratesfortheassayofalpha-amylaseand(1-4)-β-D-glucanase.
McCleary,B.V.(1980).CarbohydrateResearch,86(1),97-104.
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Newchromogenicsubstrateshavebeendevelopedforthequantitativeassayofalpha-amylaseand(1→4)-β-D-glucanase.Thesewerepreparedbychemicallymodifyingamyloseorcellulosebeforedyeing,toincreasesolubility.Afterdyeing,thesubstrateswereeithersolubleorcouldbereADIlydispersedtoformfine,gelatinoussUSPensions.Assaysbasedontheuseofthesesubstratesaresensitiveandhighlyspecificforeitheralpha-amylaseor(1→4)-β-D-glucanase.Themethodofpreparationcanalsobeappliedtoobtainsubstratesforotherendo-hydrolases.
Comparisonofendolytichydrolasesthatdepolymerise1,4-β-D-mannan,1,5-α-L-arABInanand1,4-β-D-galactan.
McCleary,B.V.(1991).“EnzymesinBiomassConversion”,(M.E.HimmelandG.F.Leatham,Eds.),ACSSymposiumSeries460,Chapter34,pp.437-449.AmericanChemicalSociety,Washington.
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Hydrolysisofmannan-typepolysaccharidesbyβ-mannanaseisdependentonsubstitutiononandwithinthemain-chainaswellasthesourceoftheβ-mannanaseemployed.Characterisationofreactionproductscanbeusedtodefinethesub-sitebindingrequirementsoftheenzymesaswellasthefine-structuresofthepolysaccharides.Actionofendo-arabinanaseandendo-galactanaseonarabinansandarabinogalactansisdescribed.Specificassaysforendo-arabinanaseandarabinan(infruit-juiceconcentrates)arereported.
Measurementofpolysaccharidedegradingenzymesusingchromogenicandcolorimetricsubstrates.
McCleary,B.V.(1991).ChemistryinAustralia,58,398-401.
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Enzymicdegradationofcarbohydratesisofmajorsignificanceintheindustrialprocessingofcerealsandfruits.Intheproductionofbeer,barleyisgerminatedunderwelldefinedconditions(malting)toinducemaximumenzymesynthesiswithminimumrespirationofreservecarbohydrates.Thegrainsaredriedandthenextractedwithwaterundercontrolledconditions.Theamylolyticenzymessynthesizedduringmalting,aswellasthosepresentintheoriginalbarley,convertthestarchreservestofermentablesugars.Otherenzymesactonthecellwallpolysaccharides,mixed-linkageβ-glucanandarabinoxylan,reducingtheviscosityandthusaidingfiltration,andreducingthepossibilityofsubsequentprecipitationofpolymericmaterial.Inbaking,β-amylaseandα-amylasegivecontrolleddegradationofstarchtofermentablesugarssoastosustainyeastgrowthandgasproduction.Excessquantitiesofα-amylaseintheflourresultinexcessivedegradationofstarchduringbakingwhichinturngivesastickycrumbtextureandsubsequentproblemswithbreadslicing.Juiceyieldfromfruitpulpissignificantlyimprovedifcell-walldegradingenzymesareusedtodestroythethree-dimensionalstructureandwaterbindingcapacityofthepecticpolysaccharidecomponentsofthecellwalls.Problemsofroutineandreliableassayofcarbohydratedegradingenzymesinthepresenceofhighlevelsofsugarcompoundsareexperiencedwithsuchindustrialprocess.
Optimisingtheresponse.
Acamovic,T.&McCleary,B.V.(1996).FeedMix,4,14-19.
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Afinebalanceexistsbetweenenzymeactivityandtheadverseeffectsassociatedwithfeedprocessing.Accurateestimationofenzymeactivityinthefeedisapre-requisitetooptimisingtheresponse.


