Journal
CARBOHYDRATE POLYMERS
Volume 79, Issue 3, Pages 541-546Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2009.08.040
Keywords
Complex coacervation; Potentiometric curve; FT-IR; Rheology; Microstructure
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Funding
- Consejo Nacional de Ciencia y Tecnologia de Mexico (CONACyT) [U81157-Z]
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In this study gum Arabic (GA) and chitosan (Ch) electrostatic complexes were formed at different pH values (3.0, 4.5, and 6.0) and the theological and microstructural characteristics of the coacervates were evaluated. Potentiometric titration experiments established that maximum inter-biopolymer interactions occurred at a GA-Ch weight ratio of 5:1. Fourier Transform Infrared Spectroscopy (FT-IR) results showed that the inter-biopolymeric complexes were formed through the interaction of the functional groups of both macromolecules (-NH(3)(+) and -COO(-)). The highest storage modulus (G') and loss modulus (G '') values were displayed by the coacervate formed at pH 4.5. Scanning electron microscopy (SEM) micrographs revealed that the coacervates were characterized by a sponge-like structure consisting of uniformly sized agglomerated interconnected particles homogeneously distributed and interspaced by heterogeneously sized vacuoles. Vacuoles size was smaller at pH 4.5 than at pH 3.0 and 6.0. (C) 2009 Elsevier Ltd. All rights reserved.
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