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Control領 of Degradation Effects in Radiation Processing of Starch
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2018-08-31 10:11 337閱讀次數(shù)
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Cornstarchofdifferentphysicalforms(solidandliquid)wasirradiatedwith60Cogammaraysandelectronbeaminthedoserangeof50Gyto100kGytoinvestigatetheeffectofionizingradiationonitsmolecularweight(Mw).Degradationwasobservedforbothsolidandliquidstatesuponradiation.However,degradationofthestarchintheliquidstatewasremarkablygreaterthanthatinthesolidstate.Thefreeradicalsthatformedduringwaterirradiationmustberesponsibleforsuchdegradationintheliquidform.Thermostatedviscometer,rheometerandmulti-anglestaticlaserlightscatteringwereemployedtostudythechangesintheMwofcornstarchthatoccurredduringirradiationatconstanttemperatureanddifferentconcentrations.ItwasobservedthatelectronbeamirradiatedcornstarchhasuniformdecreasinginMwandradiusofgyration(Rg)intherangeof(4.41072.9107gmol21)and(199.385.6nm),respectively.Theinfluenceofgasatmosphereonthedegradationprocessduringgammairradiationwasstudiedtofindthat,theMwandRgvalueswereintherangeof(4.41071.8107gmol21)and(199.3120.4nm)fortheoxygensaturatedsamples,while,theywere(4.41071.05107gmol21)and(199.385.6nm)fortheargonsaturatedsamples.
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Control領 of Degradation Effects in Radiation Processing of Starch- Cornstarchofdifferentphysicalforms(solidandliquid)wasirradiatedwith60Cogammaraysandelectronbeaminthedoserangeof50Gyto100kGytoinvestigatetheeffectofionizingradiationonitsmolecularweight(Mw).Degradationwasobservedforbothsolidandliquidstatesuponradiation.However,degradationofthestarchintheliquidstatewasremarkablygreaterthanthatinthesolidstate.Thefreeradicalsthatformedduringwaterirradiationmustberesponsibleforsuchdegradationintheliquidform.Thermostatedviscometer,rheometerandmulti-anglestaticlaserlightscatteringwereemployedtostudythechangesintheMwofcornstarchthatoccurredduringirradiationatconstanttemperatureanddifferentconcentrations.ItwasobservedthatelectronbeamirradiatedcornstarchhasuniformdecreasinginMwandradiusofgyration(Rg)intherangeof(4.41072.9107gmol21)and(199.385.6nm),respectively.Theinfluenceofgasatmosphereonthedegradationprocessduringgammairradiationwasstudiedtofindthat,theMwandRgvalueswereintherangeof(4.41071.8107gmol21)and(199.3120.4nm)fortheoxygensaturatedsamples,while,theywere(4.41071.05107gmol21)and(199.385.6nm)fortheargonsaturatedsamples.[詳細]
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2018-08-31 10:11
產品樣冊
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- Control領 of Degradation Effects in Radiation Proc
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- reductionofmolecularweightofbothpolysaccharides.IthasbeendemonstratedthatattheappliedultrasoundfrequencydegradationiscausedbothbyOHradicalsandmechanochemicaleffects.InAr-saturated2!10K2moldmK3chitosansolutions,pH3,atanultrasounddoserateof170WkgK1,theaveragesonochemicalchainscissionyieldinthesonicationtimerangeof090minisca.8!10K11molJK1.Thisyieldhasbeenshowntodependonpolymerconcentration,ultrasoundpowerandgasusedtosaturatethesolution.Scissionisaccompaniedbysidereactionsleadingtotheformationofcarbonylgroups.Ultrasound-inducedchainscissionofstarchproceedswithloweryield,oneofthereasonsbeingprobablythedifferentchainconformationwhencomparedwithrod-likechitosanmacromolecules.q2004ElsevierLtd.Allrightsreserved.[詳細]
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2018-08-31 10:11
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