期刊
JOURNAL OF CONTROLLED RELEASE
卷 102, 期 3, 页码 619-627出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jconrel.2004.10.029
关键词
protein release; conjugate addition; hydrogels; polyethylene glycol; hGH
Hydrogels were formed by conjugate addition of polyethylene glycol (PEG) multiacrylates and dithiothreitol (DTT) for encapsulation and sustained release of protein drugs; human growth hormone (hGH) was considered as an example. Prior to encapsulation, the hGH was precipitated either by Zn2+ ions or by linear PEG, to protect the hGH from reaction with the gel precursors during gelation. Precipitation by Zn2+ ions yielded precipitates that dissolved slowly and delayed release from even highly permeable gels, whereas linear PEG yielded rapidly dissolving precipitates. To independently protect the protein and delay its release, linear PEG precipitation was adopted, and release control via modulation of the PEG gel mesh size was sought. By varying the molecular weight of the multiarm PEG acrylates, control over gel swelling and hGH release, from a few hours to a few months, could be obtained. Protein release from the swollen and degrading PEG-based gel networks was modeled as a diffusion process with a time-dependent diffusion coefficient, calculated from swelling measurements and theoretical mesh sizes. Release following zero-order kinetics was obtained by the counter influences of decreasing protein concentration and increasing protein diffusion coefficient over time. (C) 2004 Elsevier B.V All tights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据