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Chemical modification and structural analysis of protein isolates to produce hydrogel using Whitemouth croaker (Micropogonias furnieri) wastes
Authors:Martins Vilásia Guimarães  Costa Jorge Alberto Vieira  Damodaran Srinivasan  Prentice Carlos
Institution:(1) Laboratory of Food Technology, School of Chemistry and Food, Federal University of Rio Grande, Rio Grande, RS, Brazil;(2) Laboratory of Biochemical Engineering, School of Chemistry and Food, Federal University of Rio Grande, Rio Grande, RS, Brazil;(3) Department of Food Science, University of Wisconsin-Madison, 1605 Linden Drive, Madison, WI 53706, USA;
Abstract:Recovery and alteration of fish protein from wastes and its use has been regarded as a promising alternative to develop useful products once polymer gels have a high capacity of water uptake. This study aims to produce hydrogel, a super absorbent biopolymer from modified fish protein, in order to evaluate the protein structure. In the modified proteins, analyses of the extent of modification of the lysine residues, electrophoresis, and electrometric titration were performed. In the hydrogels were realized assays of swelling water. The proteins with more modifications were shown as 63.5% and 75.9% of lysine residues, from fish protein isolate obtained with alkaline and acid solubilization, respectively. The modified protein in that same rate presented 332.0 and 311.4 carboxyl groups. Accordingly, the hydrogel produced from alkaline and acid isolates reached a maximum water uptake in 24 h of 79.42 and 103.25 gwater/gdry gel, respectively.
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