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Polymers 2016, 8(7), 248;

Physicochemical Properties of Biopolymer Hydrogels Treated by Direct Electric Current

Department of Animal Products Technology and Quality Management, Wroclaw University of Environmental and Life Sciences, Chelmonskiego 37/41, 51-630 Wroclaw, Poland
Faculty of Chemistry, Wroclaw University of Technology, Smoluchowskiego 23, 50-370 Wroclaw, Poland
Department of Environment Hygiene and Animal Welfare, The Faculty of Biology and Animal Science, Wrocław University of Environmental and Life Sciences, Chelmonskiego 38 C, 50-630 Wrocław, Poland
Author to whom correspondence should be addressed.
Academic Editors: Patrick Ilg and Christine Wandrey
Received: 22 April 2016 / Revised: 17 June 2016 / Accepted: 27 June 2016 / Published: 12 July 2016
(This article belongs to the Collection Polyelectrolytes)
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The objective of this study was to evaluate the changes within the physicochemical properties of gelatine (2%; 4%; 8%), carrageenan (1.5%; 2%; 2.5%) and sodium alginate (0.75%; 1%; 1.25%) hydrogels with different sodium chloride concentrations that were triggered by applying direct current (DC) of 400 mA for a duration of five minutes. There were three types of gels prepared for the purpose of the study: C, control; H, gels on the basis of hydrosols that were treated with DC; and G, gels treated with DC. In the course of the study, the authors carried out the following analyses: Texture Profile Analysis (TPA), Fourier Transform Infrared spectroscopy (FTIR), Scanning Electron Microscopy (SEM) and Swelling Ratio (SR). Furthermore, the color and pH of hydrogels were measured. The FTIR spectra showed that the structures of gelatine, carrageenan and sodium alginate do not significantly change upon applying DC. The results of TPA, SR, color and pH measurement indicate that hydrogels’ properties are significantly dependent on the type of polymer, its concentration and the type of the gel. By changing those parameters, the characteristics of such gels can be additionally tuned, which extends their applicability, e.g., in the food industry. Moreover, the analysis revealed that SR of H gel gelatine after 72 h of storage was 1.84-times higher than SR of the control sample, which indicated that this gel may be considered as a possible component for wound dressing materials. View Full-Text
Keywords: gelatine; carrageenan; sodium alginate; hydrogel; direct current; swelling ratio; TPA; SEM; FTIR gelatine; carrageenan; sodium alginate; hydrogel; direct current; swelling ratio; TPA; SEM; FTIR

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Król, Ż.; Malik, M.; Marycz, K.; Jarmoluk, A. Physicochemical Properties of Biopolymer Hydrogels Treated by Direct Electric Current. Polymers 2016, 8, 248.

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