Impact of Core-Forming Segment Structure on Drug Loading in Biodegradable Polymeric Micelles Using PEG-b-Poly(lactide-co-depsipeptide) Block Copolymers

• Published in: BioMed research international Vol. 2014; no. 2014; pp. 1 - 10
• Main Authors: Takahashi, Akihiro, Ozaki, Yuta, Kuzuya, Akinori, Ohya, Yuichi
• Format: Journal Article
• Language: English
• Published: Cairo, Egypt Hindawi Puplishing Corporation 01.01.2014; Hindawi Publishing Corporation; John Wiley & Sons, Inc; Hindawi Limited
• Subjects: Biocompatible Materials - chemical synthesis; Biocompatible Materials - chemistry; Block copolymers; Chromatography, Gel; Comparative analysis; Copolymers; Depsipeptides - chemical synthesis; Depsipeptides - chemistry; Drug Carriers - chemistry; Efficiency; Fluorescein - chemistry; Hydrodynamics; Influence; Lactates - chemical synthesis; Lactates - chemistry; Micelles; Molecular weight; NMR; Nuclear magnetic resonance; Particle Size; Phenylalanine; Polyesters - chemical synthesis; Polyesters - chemistry; Polyethylene Glycols - chemical synthesis; Polyethylene Glycols - chemistry; Polymers - chemical synthesis; Polymers - chemistry; Proton Magnetic Resonance Spectroscopy; Studies
• ISSN: 2314-6133; 2314-6141
• DOI: 10.1155/2014/579212

We synthesized series of amphiphilic AB-type block copolymers having systematic variation in the core-forming segments using poly(lactide-co-depsipeptide)s as a hydrophobic segment and prepared polymeric micelles using the block copolymers, PEG-b-poly(lactide-co-depsipeptide). We then discussed the relationship between the core-forming segment structure and drug loading efficiency for the polymeric micelles. PEG-b-poly(lactide-co-depsipeptide)s, PEG-b-PLGL containing l-leucine (Leu), and PEG-b-PLGF containing l-phenylalanine (Phe), with similar molecular weights and various mole fractions of depsipeptide units, were synthesized. Polymeric micelles entrapping model drug (fluorescein, FL) were prepared using these copolymers. As a result, PEG-b-poly(lactide-co-depsipeptide) micelles showed higher drug loading compared with PEG-b-PLLA and PEG-b-PDLLA as controls. The drug loading increased with increase in the mole fraction of depsipeptide unit in the hydrophobic segments. The introduction of aliphatic and aromatic depsipeptide units was effective to achieve higher FL loading into the micelles. PEG-b-PLGL micelle showed higher drug loading than PEG-b-PLGF micelle when the amount of FL in feed was high. These results obtained in this study should be useful for strategic design of polymeric micelle-type drug delivery carrier with high drug loading efficiency.