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

Autor: Soares LS; Departamento de Tecnologia de Alimentos (DTA), Universidade Federal de Viçosa (UFV), Campus Universitário, 36570-900 Viçosa, MG, Brazil. Electronic address: lucas.s.soares@ufv.br., Perim RB; Departamento de Tecnologia de Alimentos (DTA), Universidade Federal de Viçosa (UFV), Campus Universitário, 36570-900 Viçosa, MG, Brazil., de Alvarenga ES; Departamento de Química (DEQ), Universidade Federal de Viçosa (UFV), Campus Universitário, 36570-900 Viçosa, MG, Brazil., Guimarães LM; Departamento de Física (DPF), Universidade Federal de Viçosa (UFV), Campus Universitário, 36570-900 Viçosa, MG, Brazil., Teixeira AVNC; Departamento de Física (DPF), Universidade Federal de Viçosa (UFV), Campus Universitário, 36570-900 Viçosa, MG, Brazil., Coimbra JSDR; Departamento de Tecnologia de Alimentos (DTA), Universidade Federal de Viçosa (UFV), Campus Universitário, 36570-900 Viçosa, MG, Brazil., de Oliveira EB; Departamento de Tecnologia de Alimentos (DTA), Universidade Federal de Viçosa (UFV), Campus Universitário, 36570-900 Viçosa, MG, Brazil. Electronic address: eduardo.basilio@ufv.br.
Jazyk: angličtina
Zdroj: International journal of biological macromolecules [Int J Biol Macromol] 2019 May 01; Vol. 128, pp. 140-148. Date of Electronic Publication: 2019 Jan 23.
DOI: 10.1016/j.ijbiomac.2019.01.106
Abstrakt: Chitosan 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.
(Copyright © 2019 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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