کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1427557 | 986868 | 2006 | 9 صفحه PDF | دانلود رایگان |
The relative rates of deamidation, acylation and proteolysis (i.e. amide bond cleavage) were determined for a model peptide (VYPNGA) in poly (dl-lactide-co-glycolide) films. Films were stored at 70 °C and either 95%, 75%, 60%, 45%, 28%, or ∼0% relative humidity and at 37 °C and 95% relative humidity. Peptide degradation products were identified by ESI+ MS/MS and quantitated by LC/MS/MS. Extensive overlap of degradation mechanisms occurred, producing a complex mixture of products. Acylation was the dominant peptide degradation reaction (10–20% of total peptide) at early stages of PLGA hydrolysis and at intermediate relative humidity (60–45% RH). Deamidation and proteolysis were dominant (25–50% and 20–40% of total peptide, respectively) at later stages and at high relative humidity (95–75% RH). Understanding the relative rates of each peptide degradation reaction will allow for improved design of PLGA formulations that preserve the stability of peptide and protein drugs.
Journal: Journal of Controlled Release - Volume 112, Issue 1, 1 May 2006, Pages 111–119