Lysozyme loading and release from hydrogels carrying pendant phosphate groups

被引:38
作者
Nakamae, K [1 ]
Nizuka, T
Miyata, T
Furukawa, M
Nishino, T
Kato, K
Inoue, T
Hoffman, AS
Kanzaki, Y
机构
[1] Kobe Univ, Dept Sci & Chem Engn, Fac Engn, Nada Ku, Kobe, Hyogo 657, Japan
[2] Unichem Co Ltd, Nara 636, Japan
[3] Univ Washington, Ctr Bioengn, Seattle, WA 98195 USA
关键词
protein loading; hydrogel; polyelectrolyte; Phosmer M; lysozyme; polyion complex; protein drug delivery;
D O I
10.1163/156856297X00254
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
To develop a polymeric matrix for efficiently loading cationic biomolecules, polyelectrolyte hydrogels carrying pendant phosphate groups were synthesized by copolymerizing 2-methacryloyloxyethyl dihydrogen phosphate with N-isopropylacrylamide and N,N'-methylene-bis-acrylamide. The phosphate carrying monomer yielded anionic hydrogels, which formed ionic complexes with the cationic protein, lysozyme. It was shown that the amount of complexed lysozyme reached 2.1 g g(-1) dry gel, corresponding to 1.3 x 10(-3) mol phosphate group per gram lysozyme, when 40 mol% of phosphate-carrying monomer was incorporated in a hydrogel. When the hydrogel complexed with lysozyme was placed in deionized water and various KCI solutions, of varying concentrations of up to 0.5 M KCI, no lysozyme was released in deionized water, while increasing amounts of lysozyme were released as the KCI concentration increased. This confirmed that lysozyme was loaded in the hydrogel through electrostatic interactions. It was further found that the complexed lysozyme retained its enzymatic activity after being released from the hydrogel. These results suggest the use of this system for the controlled release of cationic protein drugs.
引用
收藏
页码:43 / 53
页数:11
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