Volume 116, Issue 1 pp. 602-609

Synthesis and characterization of pH-and salt-sensitive hydrogel based on chemically modified poultry feather protein isolate

Hailin Lin

Hailin Lin

Department of Chemistry and Chemical Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, People's Republic of China

Food and Bioprocess Engineering Laboratory, Department of Biological Systems Engineering, University of Wisconsin-Madison, Madison 53706, Wisconsin

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Eakasit Sritham

Eakasit Sritham

Food and Bioprocess Engineering Laboratory, Department of Biological Systems Engineering, University of Wisconsin-Madison, Madison 53706, Wisconsin

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Seokwon Lim

Seokwon Lim

Food and Bioprocess Engineering Laboratory, Department of Biological Systems Engineering, University of Wisconsin-Madison, Madison 53706, Wisconsin

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Yingde Cui

Yingde Cui

Department of Chemistry and Chemical Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, People's Republic of China

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Sundaram Gunasekaran

Corresponding Author

Sundaram Gunasekaran

Food and Bioprocess Engineering Laboratory, Department of Biological Systems Engineering, University of Wisconsin-Madison, Madison 53706, Wisconsin

Food and Bioprocess Engineering Laboratory, Department of Biological Systems Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706===Search for more papers by this author
First published: 01 December 2009
Citations: 5

Abstract

Hydrogels were synthesized from poultry feather protein by crosslinking ethylene diamine tetraacetic dianhydride (EDTAD)-modified feather protein isolate (FPI) with glutaraldehyde (Glu). Different molar ratios of EDTAD/FPI were used to obtain FPI of different degrees of acylate modification. Differential scanning calorimeter measurements of glass transition temperature suggested that hydrogel formation was based on the hydrogen bond between EDTAD-modified FPI segments. The swelling properties of modified FPI hydrogel were investigated in deionized water and in solutions of different salt contents (i.e., ionic strengths) and pH. An optimal swelling ratio (SR) of 63 g/g was obtained when molar ratios of EDTAD/FPI and Glu/FPI were 0.12 and 0.008, respectively. SR decreased substantially with increase in ionic strength, and at a given ionic strength, SR increased with solution pH in 4.0 to 10.0 range. The water transport mechanism of the hydrogel was also pH dependent and was controlled by Fickian diffusion and polymer relaxation. At higher pH value, the water transport profile became more dependent on polymer relaxation than at lower pH. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010

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