The Aggregation of Hydrophobically Modified Polysacc

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• The Aggregation of Hydrophobically Modified Polysacc

  The Aggregation of Hydrophobically Modified Polysacc[详细]

  2024-09-28 15:33

  标准

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• The Aggregation of Hydrophobically Modified Polysacc

  The Aggregation of Hydrophobically Modified Polysacc[详细]

  2024-09-29 01:59

  应用文章

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• Characterization of stability, aggregation, and equilibrium properties of modified natural products

  Unstablebiopolymersolutionsinevitablyleadtomis-characterizationofmacromolecularpropertiesandirreproducibleresults.Evenunderstableorquasi-stableconditions,persistentaggregatescanhamperreliablecharacterization,especiallyusinglightscatteringmethods.Variouspitfallsincharacterizingbiopolymerswereworkedthrough,includingdeterminationofsolutionstabilityzones,dissolutionkinetics,estimationoffractionofaggregatepopulations,andtherelationshipbetweenbatchandfractionationmethods.Chitosans,polyampholyticbiopolymerswithisoelectricpointaroundpH=6.0,withvaryingdegreesofcarboxymethylationwerestudied.Instabilitywasdeterminedvs.pHandionicstrengthusingahighthroughputscreeningmethod,simultaneousmultiplesamplelightscattering(SMSLS).Withstablesolutionconditionsdetermined,equilibriumbatchandmulti-detectorGPCcharacterizationofmolecularweight,intrinsicviscosity,andpolyelectrolytepropertieswasmade.Finally,afirstattemptatcontinuousonlinemonitoringofthemodificationreactionitselfwasmadeandcomparedtoFTIRanalysisofcarboxymethylationondiscretealiquots.Giventherangeofpossiblecharacterizationproblems,multipleapproacheswithindependentinstrumentsmayberequiredforreliablenaturalproductcharacterization.Onlinemonitoringofmodificationreactionsmayleadtorapidadvancesinunderstandingandpreparationofnaturalproducts.[详细]

  2018-08-31 10:11

  产品样册

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• Characterization of stability, aggregation, and equilibrium properties of modified natural products;

  Unstablebiopolymersolutionsinevitablyleadtomis-characterizationofmacromolecularpropertiesandirreproducibleresults.Evenunderstableorquasi-stableconditions,persistentaggregatescanhamperreliablecharacterization,especiallyusinglightscatteringmethods.Variouspitfallsincharacterizingbiopolymerswereworkedthrough,includingdeterminationofsolutionstabilityzones,dissolutionkinetics,estimationoffractionofaggregatepopulations,andtherelationshipbetweenbatchandfractionationmethods.Chitosans,polyampholyticbiopolymerswithisoelectricpointaroundpH=6.0,withvaryingdegreesofcarboxymethylationwerestudied.Instabilitywasdeterminedvs.pHandionicstrengthusingahighthroughputscreeningmethod,simultaneousmultiplesamplelightscattering(SMSLS).Withstablesolutionconditionsdetermined,equilibriumbatchandmulti-detectorGPCcharacterizationofmolecularweight,intrinsicviscosity,andpolyelectrolytepropertieswasmade.Finally,afirstattemptatcontinuousonlinemonitoringofthemodificationreactionitselfwasmadeandcomparedtoFTIRanalysisofcarboxymethylationondiscretealiquots.Giventherangeofpossiblecharacterizationproblems,multipleapproacheswithindependentinstrumentsmayberequiredforreliablenaturalproductcharacterization.Onlinemonitoringofmodificationreactionsmayleadtorapidadvancesinunderstandingandpreparationofnaturalproducts.[详细]

  2018-08-31 10:11

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• Aggregation Kinetics of Citrate and Polyvinylpyrroli

  Aggregation Kinetics of Citrate and Polyvinylpyrroli[详细]

  2024-09-27 23:57

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• Studies on Co-based catalysts supported on modified

  Studies on Co-based catalysts supported on modified[详细]

  2009-08-03 00:00

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• Stability and Aggregation of Metal Oxide Nanoparticl

  Stability and Aggregation of Metal Oxide Nanoparticl[详细]

  2014-09-10 00:00

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• SEC-MS for the Analysis Aggregation in Protein Mixtu

  SEC-MS for the Analysis Aggregation in Protein Mixtu[详细]

  2024-09-28 14:37

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• Stability and Aggregation of Metal Oxide Nanoparticles in Natural Aqueous Matrices

  StabilityandAggregationofMetalOxideNanoparticlesinNaturalAqueousMatrices[详细]

  2018-08-31 10:11

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• Bone-Targeting Peptide and RNF146 Modified Apoptotic Extracellular Vesicles Alleviate Osteoporosis

  Bone-Targeting Peptide and RNF146 Modified Apoptotic Extracellular Vesicles Alleviate Osteoporosis[详细]

  2024-12-09 09:40

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• Reduced aggregation and sedimentation of zero-valent iron nanoparticles in the presence of guar gum

  Reduced aggregation and sedimentation of zero-valent iron nanoparticles in the presence of guar gum[详细]

  2013-11-25 00:00

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• Aggregation Kinetics of Citrate and Polyvinylpyrrolidone Coated Silver Na in Monovalent and Divalent

  Theaggregationkineticsofsilvernanoparticles(AgNPs)thatwerecoatedwithtwocommonlyuseagentscitrateandpolyvinylpyrrolidone(PVP)wereinvestigated.Time-resolveddynamiclight(DLS)wasemployedtomeasuretheaggregationkineticsoftheAgNPsoverarangeofmonovalenelectrolyteconcentrations.Theaggregationbehaviorofcitrate-coatedAgNPsinNaClwasinexcelwiththepredictionsbasedonDerjaguinLandauVerweyOverbeek(DLVO)theory,andtheHamofcitrate-coatedAgNPsinaqueoussolutionswasderivedtobe3.7×10J.Divalentelectrolytesefficientindestabilizingthecitrate-coatedAgNPs,asindicatedbytheconsiderablylowercriticalcconcentrations(2.1mMCaCland2.7mMMgClvs.47.6mMNaCl).ThePVP-coatedAgNPswsignificantlymorestablethancitrate-coatedAgNPsinbothNaClandCaCl,whichislikelyduetorepulsionimpartedbythelarge,non-chargedpolymers.Theadditionofhumicacidresultedinthethemacromoleculesonbothcitrate-andPVP-coatedAgNPs.TheadsorptionofhumicacidinduceelectrostericrepulsionthatelevatedthestabilityofbothnanoparticlesinsuspensionscontainingNaconcentrationsofCaCl.Conversely,enhancedaggregationoccurredforbothnanoparticlesathighconcentrationsduetointerparticlebridgingbyhumicacidclusters.[详细]

  2018-08-31 10:11

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• Aggregation Kinetics of Multiwalled Carbon Nanotubes in Aquatic Systems: Measurements and Environmen

  作者：NAVIDB.SALEH,LISAD.PFEFFERLE,ANDMENACHEMELIMELECH　　（DepartmentofChemicalEngineering,YaleUniversity,NewHaven,Connecticut06520-8286）　　摘要：Theinitialaggregationkineticsofmultiwalledcarbonnanotubes（MWNTs）wereexaminedthroughtime-resolveddynamiclightscattering.AggregationofMWNTswasevaluatedbyvaryingsolutionpHandtheconcentrationofmonovalent（NaCl）anddivalent（CaCl2andMgCl2）salts.SuwanneeRiverhumicacid（SRHA）wasusedtostudytheeffectofbackgroundnaturalorganicmatteronMWNTaggregationkinetics.IncreasingsaltconcentrationandadditionofdivalentcalciumandmagnesiumionsinducedMWNTaggregationbysuppressingelectrostaticrepulsion,similartoobservationswithaquaticcolloidalparticles.Thecriticalcoagulationconcentration（CCC）valuesforMWNTswereestimatedas25mMNaCl,2.6mMCaCl2,and1.5mMMgCl2.AnincreaseinsolutionpHfromacidic（pH3）tobasic（pH11）conditionsresultedinasubstantial（over2ordersofmagnitude）decreaseinMWNTaggregationkinetics,suggestingthepresenceofionizablefunctionalgroupsontheMWNTcarbonscaffold.ThepresenceofhumicacidinsolutionmarkedlyenhancedthecolloidalstabilityofMWNTs,reducingtheaggregationratebynearly2ordersofmagnitude.TheenhancedMWNTstabilityinthepresenceofhumicacidisattributabletostericrepulsionimpartedbyadsorbedhumicacidmacromolecules.OurresultssuggestthatMWNTsarerelativelystableatsolutionpHandelectrolyteconditionstypicalofaquaticenvironments.[详细]

  2018-08-31 10:11

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• Thermomechanically Induced Protein Aggregation and Starch Structural Changes in Wheat Flour Dough

  Thermomechanically Induced Protein Aggregation and Starch Structural Changes in Wheat Flour Dough[详细]

  2014-03-12 00:00

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• Injectable hydrogels with in situ-forming hydrophobic domains: oligo(D,L-lactide) modified poly(olig

  Injectable,insitu-gel领nanostructuredhydrogelshavebeenpreparedfromhydrazideandaldehydefunctionalizedpolymerprecursorsbasedonacopolymerofoligo(ethyleneglycol)methacrylate(OEGMA)andanoligo(lacticacid)macromonomer(OLA)withvaryinglacticacidchainlengths.Theresultinghydrogelscontainamixofchemical(hydrazonebondformationbetweenhydrazideandaldehydegroups)andphysical(hydrophobicinteractionsbetweenOLAchains)cross-linkswhichformcompetitivelyasafunctionoftheOLAchainlengthanddensity.AnincreaseintheOLAchainlengthanddensityresultsintheformationofmorephysicalcross-linksandfewerchemicalcross-links.Tuningtherelativeprevalenceofphysicalandchemicalcross-linkformationfacilitatedlargelyindependenttuningofgelmechanicsrelativetogelswel领anddegradation.Small-angleneutronscatteringoftheseOLA-containinghydrogelsrevealsamicrostructureconsistingofassociativehydrophobicdomains,basedonanincreasedscatteringintensityanddecreasedblobsizerelativetothatobservedforPOEGMAhydrogelspreparedwithouttheOLAco-monomer.ThepresenceofhydrophobicOLAdomainsincreasestheuptakeandslowsthereleaseofbovineserumalbumin,aproteinwell-knowntoassociatewithhydrophobicdomains.Coupledwiththeobservedcytocompatibilityofthereactiveprecursorpolymersusedtopreparethehydrogels,weanticipatesignificantpotentialapplicationsofthesehydrogelsfortheprolongedreleaseofhydrophobiccargoes.[详细]

  2018-08-31 10:11

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• Injectable hydrogels with in situ-forming hydrophobic domains: oligo(D,L-lactide) modified poly(oligoethylene glycol methacrylate) hydrogels?

  Injectable hydrogels with in situ-forming hydrophobic domains: oligo(D,L-lactide) modified poly(oligoethylene glycol methacrylate) hydrogels?[详细]

  2024-09-28 00:48

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