期刊
INTERNATIONAL JOURNAL OF PHARMACEUTICS
卷 383, 期 1-2, 页码 216-227出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijpharm.2009.09.018
关键词
Oral delivery; Proteins and peptides; Polymeric micelles; Nanocomplexes; Enzymatic degradation; Amphiphilic polymers
资金
- The Cunningham Trust
Nanocomplexes formed between amphiphilic poly(allylamine) (PAA) and insulin were prepared, characterised and the impact of polymer architecture on the protection of insulin against three enzymes was investigated. PAA previously modified with either cetyl or cholesteryl pendant groups at two levels of hydrophobic grafting and its quaternised derivatives were used to produce polymer-insulin nanocomplexes. Transmittance study, differential scanning calorimetry, hydrodynamic size and zeta potential measurement were conducted and the morphology of the complexes were visualised using transmission electron microscopy. All polymers were found to have an optimal polymer to insulin ratio of 0.4:1 mg mL(-1) with particle size ranging from 88 to 154nm. Polymer architecture has an impact on the morphology of the complexes produced but has little influence on the complexation efficiency (CE). Almost all polymers were unable to produce complexes with a CE of above 50%. Most polymers demonstrated an ability to reduce insulin degradation by trypsin while the polymer architecture plays a pivotal role against a-chymotrypsin and pepsin degradation. Quaternised cholesteryl polymers were able to significantly limit insulin degradation by alpha-chymotrypsin while cetyl polymers were particularly effective against pepsin degradation. These results indicated that a combination of polymers might be required to enhance protection against all three proteolytic enzymes for efficacious oral delivery of insulin. (C) 2009 Elsevier B.V. All rights reserved.
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