Insights on physicochemical aspects of chitosan dispersion in aqueous solutions of acetic, glycolic, propionic or lactic acid

dc.creatorSoares, Lucas de Souza
dc.creatorPerim, Rayza Badiani
dc.creatorAlvarenga, Elson Santiago de
dc.creatorGuimarães, Luciano de Moura
dc.creatorTeixeira, Alvaro Vianna Novaes de Carvalho
dc.creatorCoimbra, Jane Sélia dos Reis
dc.creatorOliveira, Eduardo Basílio de
dc.date2019-03-21T18:09:25Z
dc.date2019-03-21T18:09:25Z
dc.date2019-05-01
dc.date.accessioned2023-09-27T21:47:51Z
dc.date.available2023-09-27T21:47:51Z
dc.identifier0141-8130
dc.identifierhttps://doi.org/10.1016/j.ijbiomac.2019.01.106
dc.identifierhttp://www.locus.ufv.br/handle/123456789/24075
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/8966281
dc.descriptionChitosan is a polysaccharide well-known for its applicability as a biocompatible, biodegradable, and non-toxic material to produce drugs excipients and food coatings. Acidic media are required to disperse chitosan, and aqueous solutions of acetic acid have been typically used for this purpose. However, this acid has several sensory drawbacks. In this study, chitosan was dispersed [0.1 g·(100 mL)−1] in aqueous media containing acetic (AA), glycolic (GA), propionic (PA), or lactic (LA) acid, at 10, 20, 30, 40, or 50 mmol·L−1. The increase of acid concentration reduced pH and viscosity of the dispersions, and |ζ potential| of dispersed particles. Conversely, it increased electrical conductivity and density of the dispersions, and hydrodynamic diameter of dispersed particles. At a given concentration, these effects were slightly more pronounced for dispersions formed with GA or LA, compared to AA or PA. FT-IR data suggested more intense attractive interactions of chitosan chains with glycolate and lactate anions, than with acetate and propionate. Chitosan chains interacted more strongly with hydroxylated acids counter-anions than with their non-hydroxylated counterparts, leading to slight quantitative changes of physicochemical properties of these systems. Then, in physicochemical terms, GA, LA or PA are suitable to replace AA when preparing aqueous chitosan dispersions for technological applications.
dc.formatpdf
dc.formatapplication/pdf
dc.languageeng
dc.publisherInternational Journal of Biological Macromolecules
dc.relationVolume 128, Pages 140-148, May 2019
dc.rightsElsevier B. V.
dc.subjectChitosan
dc.subjectOrganic acids
dc.subjectColloidal dispersions
dc.titleInsights on physicochemical aspects of chitosan dispersion in aqueous solutions of acetic, glycolic, propionic or lactic acid
dc.typeArtigo


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