Degradation of chitosan and starch by 360-kHz ultras

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• Degradation of chitosan and starch by 360-kHz ultras

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  2024-09-28 00:58

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• Degradation of chitosan and starch by 360-kHz ultrasound

  reductionofmolecularweightofbothpolysaccharides.IthasbeendemonstratedthatattheappliedultrasoundfrequencydegradationiscausedbothbyOHradicalsandmechanochemicaleffects.InAr-saturated2!10K2moldmK3chitosansolutions,pH3,atanultrasounddoserateof170WkgK1,theaveragesonochemicalchainscissionyieldinthesonicationtimerangeof090minisca.8!10K11molJK1.Thisyieldhasbeenshowntodependonpolymerconcentration,ultrasoundpowerandgasusedtosaturatethesolution.Scissionisaccompaniedbysidereactionsleadingtotheformationofcarbonylgroups.Ultrasound-inducedchainscissionofstarchproceedswithloweryield,oneofthereasonsbeingprobablythedifferentchainconformationwhencomparedwithrod-likechitosanmacromolecules.q2004ElsevierLtd.Allrightsreserved.[详细]

  2018-08-31 10:11

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• Control领 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.[详细]

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