Mechanical characterization of biopolymer-based hydrogels enriched with Paulownia extracts recovered using a green technique
UNIVERSAL IDENTIFIER: http://hdl.handle.net/11093/1882
EDITED VERSION: https://www.mdpi.com/2076-3417/10/23/8439
UNESCO SUBJECT: 2205.02 Mecánica de Medios Continuos ; 3303.03 Procesos Químicos ; 2206.10 Polímeros
DOCUMENT TYPE: article
This study deals with the development and mechanical characterization of innovative starch- and gelatin-based hydrogels enriched with hydrothermal aqueous extracts from Paulownia (i.e., bark, leaves, petioles). The color, rheology, and texture properties of formulated biopolymer-based hydrogels depending on the processing conditions of the extracts was evaluated for the different Paulownia fractions. Results indicated that a clear impact on color features of the tested hydrogels was observed with the incorporation of Paulownia extracts. Rheological testing showed that weak and intermediate strength hydrogels were identified for starch- and gelatin-based hydrogels independently of used extract. A relevant softening of all gelled matrices was observed in the presence of recovered liquor extracts involving the following trend (leaves > barks > petioles). For all fractions, the highest viscoelastic features were achieved for hydrogels made with extracts recovered at 140 °C. Texture outcomes confirmed the rheological achievements. No syneresis was observed in developed hydrogels after two weeks of cold storage.
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