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Effect of structural factors on release profiles of camptothecin from block copolymer conjugates with high load of drug.
- Source :
-
International journal of pharmaceutics [Int J Pharm] 2018 Mar 01; Vol. 538 (1-2), pp. 231-242. Date of Electronic Publication: 2018 Jan 16. - Publication Year :
- 2018
-
Abstract
- The aim of the present work was the synthesis and study the kinetics and profiles of camptothecin (CPT) release form block co- and ter-polymer conjugates comprising polylactide (PLA) segments and CPT moieties, structurally diverse by degrees of branching, content of d-PLA units and poly(ethylene glycol) methyl ether methacrylate (PEGMA). Six PLA, non-toxic macroinitiators (MIs), terminated with α-bromoester were synthesized. MIs were subjected to polymerization of CPT methacrylic derivative (CPTMA) with PEGMA at various ratios. The average contents of CPT from elemental analysis, NMR and UV-GPC were approximate to each other. The number of CPT molecules and PEGMA units was in the range of 9-195 and 0-280 per conjugate, respectively. PEGMA units plasticized PLA causing increase of its crystallinity, whereas 7% and more of d-PLA caused material amorphous. PEGMA units decreased thermal stability of conjugates, however it compatibillized the separated phases of PLA and PCPTMA, based on AFM. In vitro release rate of CPT from linear PLA conjugates deposited on injection-molded PLA bars increased by introduction of PEGMA units with zero-order kinetics and Korsmeyer-Peppas model indicating the super case II transport. Branched conjugates revealed some burst release and then the release was rather of first-order-kinetics with respect to CPT with non-Fickian transport.<br /> (Copyright © 2018 Elsevier B.V. All rights reserved.)
- Subjects :
- Antineoplastic Agents, Phytogenic chemistry
Camptothecin chemistry
Crystallization
Drug Carriers chemistry
Drug Liberation
Drug Stability
Kinetics
Magnetic Resonance Spectroscopy
Methacrylates chemistry
Models, Chemical
Polyesters chemistry
Polyethylene Glycols chemistry
Polymerization
Antineoplastic Agents, Phytogenic administration & dosage
Camptothecin administration & dosage
Chemistry, Pharmaceutical methods
Polymers chemistry
Subjects
Details
- Language :
- English
- ISSN :
- 1873-3476
- Volume :
- 538
- Issue :
- 1-2
- Database :
- MEDLINE
- Journal :
- International journal of pharmaceutics
- Publication Type :
- Academic Journal
- Accession number :
- 29341920
- Full Text :
- https://doi.org/10.1016/j.ijpharm.2018.01.022