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Polymers 2018, 10(2), 112;

Novel Biological Hydrogel: Swelling Behaviors Study in Salt Solutions with Different Ionic Valence Number

College of Agronomy and Resources Environment, Tianjin Agricultural University, Tianjin 300384, China
Key Laboratory of Advanced Textile Composites (Tianjin Polytechnic University), Ministry of Education; School of Textiles, Tianjin Polytechnic University, Tianjin 300387, China
Key Laboratory of Science & Technology of Eco-Textile, Donghua University, Shanghai 201620, China
Authors to whom correspondence should be addressed.
Received: 18 December 2017 / Revised: 20 January 2018 / Accepted: 22 January 2018 / Published: 24 January 2018
(This article belongs to the Special Issue Hydrogels in Tissue Engineering and Regenerative Medicine)
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In this paper, poly γ-glutamic acid/ε-polylysine (γ-PGA/ε-PL) hydrogels were successful prepared. The γ-PGA/ε-PL hydrogels could be used to remove Na+, Ca2+, and Cr3+ from aqueous solution and were characterized by scanning electron microscopy. The performance of hydrogels were estimated under different ionic concentration, temperature, and pH. The results showed that the ionic concentration and the pH significantly influenced the swelling capacity of γ-PGA/ε-PL hydrogels. The swelling capacities of γ-PGA/ε-PL hydrogels were decreased with the increase of the ionic concentration. However, the swelling capacity of the γ-PGA/ε-PL hydrogel was increased with the increase of the pH. The swelling kinetics indicated that γ-PGA/ε-PL hydrogels presented a more limited swelling degree in metal ion solutions with higher ionic valence numbers than in ion solutions with lower ionic valence numbers. However, the swelling kinetics of γ-PGA/ε-PL hydrogels showed that they proposed a satisfactory description in NaCl and CaCl2 solutions. The adsorption process was fitted with a pseudo-second-order rate equation model. Moreover, the desorption kinetics of γ-PGA/ε-PL hydrogels showed that they could release most of the adsorption ions. Considering the biocompatibility, biodegradability, and ionic-sensitive properties, we propose that these γ-PGA/ε-PL hydrogels have high potential to be used in environmental protection, medical treatment, and other related fields. View Full-Text
Keywords: poly γ-glutamic acid; ε-polylysine; hydrogels; swelling behaviors poly γ-glutamic acid; ε-polylysine; hydrogels; swelling behaviors

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Wang, Y.; He, G.; Li, Z.; Hua, J.; Wu, M.; Gong, J.; Zhang, J.; Ban, L.-T.; Huang, L. Novel Biological Hydrogel: Swelling Behaviors Study in Salt Solutions with Different Ionic Valence Number. Polymers 2018, 10, 112.

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