Thermodynamic mechanism of particulation of sodium alginate and chitosan polyelectrolyte complexes as a function of charge ratio and order of addition

Simple item page
dc.contributor.authorYilmaz T.
dc.contributor.authorMaldonado L.
dc.contributor.authorTurasan H.
dc.contributor.authorKokini J.
dc.date.accessioned2024-07-22T08:08:32Z
dc.date.available2024-07-22T08:08:32Z
dc.date.issued2019
dc.description.abstractThis study focused on mechanistic understanding of the effect of charge ratio, order of addition and resulting thermodynamics of interaction on the formation and properties of polyelectrolyte complexes (PECs) from sodium alginate and chitosan at a constant tightly controlled pH 4 where the zeta potential difference was maximum for the formation of PECs. The morphology, particle size and particle size distribution as well as the stability of PECs were investigated as a function of molar charge ratio, and the order of addition. The association binding constant K a and the stoichiometry of interaction between the two electrolytes, evaluated using Isothermal titration calorimetry, showed that the stoichiometry and enthalpy of reactions were strongly affected by the order of addition and influenced the average particle size and zeta potential of PECs. The addition of alginate (-) into chitosan (+) gave positively charged particles and resulted in stronger interactions characterized by larger enthalpy and entropy of complexation which led to smaller particles. Reversing the order of addition gave negatively charged particles that were larger. Morphologies of complexes studied using scanning electron microscopy (SEM) showed distorted spherical particles for both orders of addition and at most charge ratios. Stability during 8 weeks was found to depend on the order of addition and charge ratio. Alginate in chitosan gave more stable PECs consistent with the thermodynamics of interaction which showed stronger interactions for this order of addition. The particle sizes and size distributions rapidly increased near electrical neutrality during storage at 4 °C where aggregation was facilitated because of electrical neutrality but particles were stable when the net charge was either strongly positive or strongly negative. © 2019 Elsevier Ltd
dc.identifier.DOI-ID10.1016/j.jfoodeng.2019.03.002
dc.identifier.issn02608774
dc.identifier.urihttp://akademikarsiv.cbu.edu.tr:4000/handle/123456789/14442
dc.language.isoEnglish
dc.publisherElsevier Ltd
dc.rightsAll Open Access; Hybrid Gold Open Access
dc.subjectAssociation reactions
dc.subjectCalorimeters
dc.subjectCalorimetry
dc.subjectCharged particles
dc.subjectChitosan
dc.subjectConvergence of numerical methods
dc.subjectEnthalpy
dc.subjectIsotherms
dc.subjectMolar ratio
dc.subjectParticle size
dc.subjectParticle size analysis
dc.subjectPolyelectrolytes
dc.subjectScanning electron microscopy
dc.subjectSize distribution
dc.subjectSodium alginate
dc.subjectStoichiometry
dc.subjectTitration
dc.subjectZeta potential
dc.subjectAverage particle size
dc.subjectCharge ratio
dc.subjectElectrical neutrality
dc.subjectIsothermal titration calorimetry
dc.subjectOrder of addition
dc.subjectPolyelectrolyte complexes
dc.subjectPotential difference
dc.subjectThermodynamic mechanism
dc.subjectComplexation
dc.titleThermodynamic mechanism of particulation of sodium alginate and chitosan polyelectrolyte complexes as a function of charge ratio and order of addition
dc.typeArticle

Files

Collections

Scopus Koleksiyonu