Portilla-Arias, Jose A. and Garcia-Alvarez, Montserrat and Martinez de Ilarduya, Antxon and Holler, Eggerhard and Galbis, Juan A. and Munoz-Guerra, Sebastian (2008) Synthesis, degradability, and drug releasing properties of methyl esters of fungal poly(beta,L-malic acid). MACROMOLECULAR BIOSCIENCE, 8 (6). pp. 540-550. ISSN 1616-5187,
Full text not available from this repository. (Request a copy)Abstract
Methyl esters of microbial poly(beta,L-malic acid) for conversion degrees of 25, 50, 75, and 100% were prepared by treatment of the polyacid with diazomethane. Esterification proceeded with retention of the molecular weight of the parent polyacid and the copolymers displayed a blocky microstructure consisting of short segments of malic and methyl malate sequences. The thermal stability of the copolyesters was lower than those of the parent homopolymers and all of them were fairly crystalline with melting temperatures within the range of 170-175 degrees C. They were degraded rapidly by water, the hydrolysis rate being highly dependent on the methylation degree. Microspheres with mean-average diameters in the range of 1-20 mu m were prepared from the 100% methylated product by the emulsion-evaporation solvent method. Encapsulation of erythromycin was efficiently performed in these microparticles and its releasing upon incubation in simulated physiological medium was evaluated for different drug loads. Drug delivery was observed to occur by a releasing mechanism largely determined by the hydrodegradation of the host polymer and independent of the amount of loaded drug.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | POLY(BETA-MALIC ACID); POLY(MALIC ACID); CRYSTALLIZATION; DEGRADATION; COMPLEXES; DELIVERY; POLYMERS; biodegradable polyester; DDS polyester; esterification; functional polyester; gel permeation chromatography; methyl polymalate; polymalic acid; polyester microspheres |
| Subjects: | 500 Science > 570 Life sciences |
| Divisions: | Biology, Preclinical Medicine > Institut für Biophysik und physikalische Biochemie Biology, Preclinical Medicine > Institut für Biophysik und physikalische Biochemie > Alumni or Retired > Prof. Dr. Eggehard Holler |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 29 Oct 2020 09:57 |
| Last Modified: | 29 Oct 2020 09:57 |
| URI: | https://pred.uni-regensburg.de/id/eprint/30740 |
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